Emergence, height, grain yield and oil content of camelina and canola grown in saline media

2010 ◽  
Vol 90 (1) ◽  
pp. 151-164 ◽  
Author(s):  
H. Steppuhn ◽  
K C Falk ◽  
R. Zhou
Keyword(s):  
Grain Yield ◽  
Salinity Tolerance ◽  
Oil Content ◽  
Salt Resistance ◽  
Shoot Biomass ◽  
Tolerance Index ◽  
False Flax ◽  
Testing Facility ◽  
Plant Emergence ◽  
Tolerance Testing

Crops of CS15 camelina and InVigor 9590 canola, grown under field conditions in Canada’s Salinity Tolerance Testing Facility, were evaluated for plant emergence, height, shoot biomass, grain yield, oil content and composition. The crops were seeded directly into sand tanks flushed four times daily with hydroponics consisting of nutrients and salts ranging in salinity from negligible to severe. Sulphate-based solutions averaging 1.4 (nutrients only), 3.0, 6.0, 10.0, 14.7, 19.9, and 27.0 dS m-1 in electrical conductivity (ECsol) resulted in respective cumulative emergence of 99.0 to 42.1% for the camelina and 99.3 to 79.6% for the canola and showed statistical differences only at the two highest salinity treatments. Plant height differences between the camelina and the canola increased as salinity increased: from 16% at 1.4 dS m-1 to 60% at 19.9 dS m-1. Grain yields under salinity relative to the salt-free yield decreased more for the camelina than for the canola at all ECsol-levels. The salinity tolerance index based on the ECsol -value at 50% of the maximum grain yield indicated that the camelina registered less than half (7.4) of that for the canola (18.0). The percentage oil content of the canola oilseed averaged 40% until salinity exceeded 20 dS m-1, while that of the camelina averaged 35% until 10 dS m-1, before declining. Key words: Camelina sativa, false flax, salinity tolerance, salt resistance, Brassica napus, canola

scholarly journals Evaluation of salinity tolerance indices in North African barley accessions at reproductive stage

2019 ◽  
Vol 55 (No. 2) ◽  
pp. 61-69 ◽  
Author(s):  
Dorsaf Allel ◽  
Anis BenAmar ◽  
Mounawer Badri ◽  
Chedly Abdelly
Keyword(s):  
Salt Tolerance ◽  
Grain Yield ◽  
Salinity Tolerance ◽  
Selection Criteria ◽  
Reproductive Stage ◽  
Shoot Biomass ◽  
Salt Tolerant ◽  
North African ◽  
Grain Number ◽  
Selection Indices

Soil salinity is one of the main factors limiting cereal productivity in worldwide agriculture. Exploitation of natural variation in local barley germplasm is an effective approach to overcome yield losses. Three gene pools of North African Hordeum vulgare L. grown in Tunisia, Algeria and Egypt were evaluated at the reproductive stage under control and saline conditions. Assessment of stress tolerance was monitored using morphological, yield-related traits and phenological parameters of reproductive organs showing significant genetic variation. High heritability and positive relationships were found suggesting that some traits associated with salt tolerance could be used as selection criteria. The phenotypic correlations revealed that vegetative traits including shoot biomass, tiller number and leaf number along with yield-related traits such as spike number, one spike dry weight, grain number/plant and grain number/spike were highly positively correlated with grain yield under saline conditions. Hence, these traits can be used as reliable selection criteria to improve barley grain yield. Keeping a higher shoot biomass and longer heading and maturity periods as well as privileged filling ability might contribute to higher grain production in barley and thus could be potential target traits in barley crop breeding toward improvement of salinity tolerance. Multiple selection indices revealed that salt tolerance trait index provided a better discrimination of barley landraces allowing selection of highly salt-tolerant and highly productive genotypes under severe salinity level. Effective evaluation of salt tolerance requires an integration of selection indices to successfully identify and characterize salt tolerant lines required for valuable exploitation in the management of salt-affected areas.  

Grain yields from spring-sown Canadian wheats grown in saline rooting media

1997 ◽  
Vol 77 (1) ◽  
pp. 63-68 ◽  
Author(s):  
H. Steppuhn ◽  
K. G. Wall
Keyword(s):  
Salt Tolerance ◽  
Root Zone ◽  
The United States ◽  
Salt Resistance ◽  
Laboratory Procedure ◽  
Rooting Media ◽  
Full Complement ◽  
Plant Emergence ◽  
Tolerance Testing ◽  
Greenhouse Tests

Farmers seek information about the salt tolerances of wheat. Two greenhouse tests conducted at the Swift Current Salt Tolerance Testing Laboratory determined the response of four spring-sown Canadian wheat cultivars (Katepwa, Biggar, Fielder and Kyle) to increasingly saline rooting media. The first test followed the United States Salinity Laboratory procedure of increasing root-zone salinity gradually after plant emergence, and the second provided full complements of salts before seeding. The plants were grown in sand tanks irrigated four times daily with hydroponic solutions containing salt concentrations of up to 14 dS m−1 equivalent electrical conductivity for saturated soil paste extracts (ECe) Grain yield and plant height began to decline within all cultivars at equivalent ECe-values ranging between 0.5 and 2.5 dS m−1. At 4 dS m−1, grain production dropped to 80% or less of that produced in non-saline rooting media. Kyle and Fielder plants showed slightly more salt tolerance than those of Katepwa or Biggar (i.e., moderately sensitive rather than sensitive). Gradually adding the salts after plant emergence resulted in a tendency for greater salt-tolerance estimates than obtained by subjecting the plants to the full complement of salts at seeding. At the concentrations tested, the salinity affected the number of fertile spikes per plant more than it affected the number of plants reaching harvest. Key words: Salt tolerance, salt resistance, salinity, crop growth modelling, crop response

scholarly journals GWAS hints at pleiotropic roles for FLOWERING LOCUS T in flowering time and yield-related traits in canola

2019 ◽  
Author(s):  
Harsh Raman ◽  
Rosy Raman ◽  
Yu Qiu ◽  
Avilash Singh Yadav ◽  
Sridevi Sureshkumar ◽  
...  
Keyword(s):  
Grain Yield ◽  
Flowering Time ◽  
Shoot Biomass ◽  
Oilseed Crop ◽  
Flowering Locus T ◽  
Dh Population ◽  
Plant Emergence ◽  
Flowering Locus ◽  
The Right ◽  
Genomic Regions

AbstractTransition to flowering at the right time is critical for local adaptation and to maximize seed yield in canola, which is an important oilseed crop. There is extensive variation among canola varieties in flowering time. However, our understanding of underlying genes and their role in canola productivity is still limited. We reveal natural variation in flowering time and response to photoperiod in a diverse GWAS panel (up to 368 accessions) of canola and identify associated SNPs across multiple experiments. Complementary QTL and eQTL mapping studies were also conducted in an Australian doubled haploid (DH) population for flowering time and other grain yield related traits. We show that several associations that were repeatedly detected across experiments map in the vicinity of FLOWERING LOCUS T (FT) paralogues and its known transcriptional regulators. QTL mapping study in a DH population detected consistent genomic regions close to FT paralogs. FT sequences vary between accessions and FT expression in field and controlled environment grown plants was correlated with flowering time. FT paralogs displayed association not only with flowering time, but also with plant emergence, shoot biomass and grain yield. Our findings suggest that FT paralogs not only modulate flowering time but also modulate yield-related productivity traits in canola.HighlightThe genetic association, eQTL and expression analyses suggest that FT paralogs have multifaceted roles in canola flowering time, plant development and productivity traits.

Emergence, height, and yield of tall, NewHy, and green wheatgrass forage crops grown in saline root zones

2005 ◽  
Vol 85 (4) ◽  
pp. 863-875 ◽  
Author(s):  
H. Steppuhn ◽  
K. Asay
Keyword(s):  
Salinity Tolerance ◽  
Root Zone ◽  
Salt Resistance ◽  
Chloride Ions ◽  
Shoot Biomass ◽  
Forage Crops ◽  
Agropyron Elongatum ◽  
Tall Wheatgrass ◽  
Salinity Levels ◽  
Tolerance Indices

The salinity tolerance of a crop relates to its inherent ability to yield economic product while subjected to root-zone salinity. Tall wheatgrass [Thinopyrum ponticum (Podp.) Liu & Wang, previously Agropyron elongatum (Horst.) Beauv.] ranks as one of the most salt-tolerant forage crops, but producers feeding or grazing livestock with it often report of its poor palatability. NewHy [Elytrigia repens (L.) Nevski × Pseudoroegneria spicata (Pursh.) A. Love] and green wheatgrasses (Elymus hoffmannii Jensen and Asay) are new forages with potentially better palatability. In order to determine the responses of these forages to saline rooting media, two tests were conducted in Canada’s Salinity Tolerance Testing Facility. The plants were grown in sand tanks flushed four times daily with hydroponic solutions consisting of nutrients and salts dominated either by chloride ions measuring from 1.5 to 48 dS m-1 or by sulphate ions from 1.5 to 50 dS m-1. In the chloride test, maximum emergence-survival, emergence rate, and emergence at the time of maximum rate for Orbit tall wheatgrass differed significantly from green wheatgrass (Breeding Strain A6) and NewHy. The maximum percent emergence and survival within the range of test salinity levels averaged 93, 88, 86% for tall, NewHy, and Strain A6 wheat grasses, respectively. In the sulphate test, maximum percent emergence-survival averaged 94, 91, and 87% for Orbit tall wheatgrass and green wheatgrass breeding strains A6 and S2 across the eight salinity levels of the test. Relative crop heights at harvest did not differ significantly among the test forages in either test. In the chloride test, shoot biomass yields relative to the salt-free production analysed by the modified-discount equation resulted in salinity-tolerance-indices of 11.2, 5.7, and 12.9 for tall, NewHy, and green wheatgrasses, respectively. In the sulphate test, salinity-tolerance indices for the tall wheatgrass, A6 and S2 green wheatgrass strains registered 11.7, 12.8, and 12.5, respectively. This and the covariance yield analyses based on paired t-tests lead to the inference that the salinity tolerance for both strains of green wheatgrass equalled that of the Orbit tall wheatgrass and exceeded that of the NewHy. Producers will soon have the option of growing AC Saltlander, a variety of green wheatgrass (Strain S2), which has just been released for commercialization and seed increase. Key words: Salt tolerance, salt resistance, salinity, tall wheatgrass, green wheatgrass, NewHy, crop response to salinity

scholarly journals Contrasting Responses of Guar Genotypes Shed Light on Multiple Component Traits of Salinity Tolerance Mechanisms

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1068
Author(s):  
Devinder Sandhu ◽  
Andrew Pallete ◽  
Manju V. Pudussery ◽  
Kulbhushan K. Grover
Keyword(s):  
Salinity Tolerance ◽  
Root Length ◽  
Industrial Applications ◽  
Shoot Biomass ◽  
Tolerance Index ◽  
Cyamopsis Tetragonoloba ◽  
Salt Tolerant ◽  
Tolerance Mechanisms ◽  
Legume Crop ◽  
Component Traits

Guar (Cyamopsis tetragonoloba (L.) Taub.) is a legume crop, and gum derived from its seeds has various industrial applications. Due to its tolerance to various abiotic stresses, guar can be grown under water-deficit or high-salinity conditions. In this investigation, four diverse guar genotypes that performed at a similar level in field conditions were evaluated in a salinity experiment in the greenhouse lysimeter system. Based on the salt tolerance index (STI) for shoot biomass, root biomass, shoot length, and root length, Matador and PI 268229 were classified as salt-tolerant, and PI 340261 and PI 537281 as salt-sensitive. Leaf Na concentrations were 4- to 5.5-fold higher, and leaf Cl concentrations were 1.6- to 1.9-fold higher in salt-sensitive lines than salt-tolerant lines under salinity. The strong associations between the leaf K concentrations under salinity compared to the control (K-salinity/K-control) ratio and STI for stem and root length advocate higher importance of K-salinity/K-control than total leaf K concentrations. The expression analyses of genes involved in Na+ and Cl− transport revealed the importance of different component traits of salinity tolerance mechanisms, such as the exclusion of Na+/Cl− from the root, sequestration of Cl− in root vacuoles, retrieval of Na+/Cl− from xylem during salinity stress, root-to-shoot Na+/Cl− translocation, and K+-Na+ homeostasis.

scholarly journals Investigating the Impact of Root-Lesion Nematodes (Pratylenchus thornei) and Crown Rot (Fusarium pseudograminearum) on Diverse Cereal Cultivars in a Conservation Farming System

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 867
Author(s):  
John P. Thompson ◽  
Timothy G. Clewett
Keyword(s):  
Grain Yield ◽  
Soil Profile ◽  
Crown Rot ◽  
Tolerance Index ◽  
Initial Population ◽  
Fusarium Pseudograminearum ◽  
Conservation Farming ◽  
Pratylenchus Thornei ◽  
Fourth Experiment ◽  
The Impact

In two experiments on a farm practicing conservation agriculture, the grain yield of a range of wheat cultivars was significantly (p < 0.001) negatively related to the post-harvest population densities of Pratylenchus thornei in the soil profile to 45 cm depth. In a third and fourth experiment with different rotations, methyl bromide fumigation significantly (p < 0.05) decreased (a) a low initial population density of P. thornei in the soil profile to 90 cm depth and (b) a high initial population of P. thornei to 45 cm depth, and a medium level of the crown rot fungus, Fusarium pseudograminearum, at 0–15 cm depth to a low level. For a range of wheat and durum cultivars, grain yield and response to fumigation were highly significantly (p < 0.001) related to (a) the P. thornei tolerance index of the cultivars in the third experiment, and (b) to both the P. thornei tolerance index and the crown rot resistance index in the fourth experiment. In the latter, grain yield was significantly (p < 0.001) positively related to biomass at anthesis and negatively related to percentage whiteheads at grain fill growth stage. One barley cultivar was more tolerant to both diseases than the wheat and durum cultivars. Crop rotation, utilizing crop cultivars resistant and tolerant to both P. thornei and F. pseudograminearum, is key to success for conservation farming in this region.

scholarly journals Nitrogen management in wheat based on the normalized difference vegetation index (NDVI)

2018 ◽  
Vol 48 (9) ◽  
Author(s):  
André Luis Vian ◽  
Christian Bredemeier ◽  
Marcos Alexandre Turra ◽  
Cecília Paz da Silva Giordano ◽  
Elizandro Fochesatto ◽  
...  
Keyword(s):  
Technical Efficiency ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Field Experiments ◽  
Shoot Biomass ◽  
Sensor Field ◽  
N Dose ◽  
Plant Emergence ◽  
The Moment ◽  
The Relationship

ABSTRACT: Biomass production and nitrogen (N) accumulated in wheat shoots may be used for quantifying optimal topdressing nitrogen doses. The objective of this study was to develop and validate models for estimating the amount of biomass and nitrogen accumulated in shoots and the N topdressing dose of maximum technical efficiency in wheat using the normalized difference vegetation index (NDVI) measured by an active optical canopy sensor. Field experiments were carried out in two years and treatments consisted of N doses applied at plant emergence and as topdressing. NDVI, shoot biomass and N accumulated in shoots at the growth stage of six fully expanded leaves and grain yield were evaluated, being determined the topdressing N dose of maximum technical efficiency (DMTE). The NDVI was positively correlated to shoot biomass and N content in shoots and models for the relationship between these variables were developed and validated. The DMTE was negatively correlated with the NDVI value evaluated at the moment of N topdressing application. Thus, NDVI evaluation by an active optical canopy sensor can be used for nitrogen fertilization in variable rate, allowing the adjustment of applied N doses in different areas within a field.

Response of durum wheat to different levels of zinc and Fusarium pseudograminearum

2014 ◽  
Vol 65 (1) ◽  
pp. 61 ◽  
Author(s):  
Mohsin S. Al-Fahdawi ◽  
Jason A. Able ◽  
Margaret Evans ◽  
Amanda J. Able
Keyword(s):  
Grain Yield ◽  
Durum Wheat ◽  
Sufficient Conditions ◽  
Crown Rot ◽  
Limiting Factors ◽  
Shoot Biomass ◽  
Zn Deficiency ◽  
Zinc Efficiency ◽  
Fusarium Pseudograminearum ◽  
Zn Concentration

Durum wheat (Triticum turgidum ssp. durum) is susceptible to Fusarium pseudograminearum and sensitive to zinc (Zn) deficiency in Australian soils. However, little is known about the interaction between these two potentially yield-limiting factors, especially for Australian durum varieties. The critical Zn concentration (concentration of Zn in the plant when there is a 10% reduction in yield) and degree of susceptibility to F. pseudograminearum was therefore determined for five Australian durum varieties (Yawa, Hyperno, Tjilkuri, WID802, UAD1153303). Critical Zn concentration averaged 24.6 mg kg–1 for all durum varieties but differed for the individual varieties (mg kg–1: Yawa, 21.7; Hyperno, 22.7; Tjilkuri, 24.1; WID802, 24.8; UAD1153303, 28.7). Zinc efficiency also varied amongst genotypes (39–52%). However, Zn utilisation was similar amongst genotypes under Zn-deficient or Zn-sufficient conditions (0.51–0.59 and 0.017–0.022 g DM μg–1 Zn, respectively). All varieties were susceptible to F. pseudograminearum but the development of symptoms and detrimental effect on shoot biomass and grain yield were significantly greater in Tjilkuri. Even though crown rot symptoms may still be present, the supply of adequate Zn in the soil helped to maintain biomass and grain yield in all durum varieties. However, the extent to which durum varieties were protected from plant growth penalties due to crown rot by Zn treatment was genotype-dependent.

scholarly journals Diallelic analysis for lysine and oil contents in maize grains

2009 ◽  
Vol 66 (2) ◽  
pp. 204-209 ◽  
Author(s):  
Leonardo Oliveira Medici ◽  
Salete Aparecida Gaziola ◽  
Vanderlei Aparecido Varisi ◽  
José Antonio Carmezini de Paula ◽  
Renato Rodrigues Ferreira ◽  
...  
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Oil Content ◽  
General Combining Ability ◽  
Lysine Content ◽  
Nitrogen Levels ◽  
N Level ◽  
Complete Series ◽  
Selection For ◽  
Selection Of

Six S5 lines of maize, with differences for lysine and oil contents in grains, were used to carry out a complete series of diallelic crosses. The resulting 15 hybrids were grown in a field at two nitrogen levels (10 and 130 kg N ha-1). The general combining ability (GCA) and specific combining ability (SCA) were obtained by using the method 4, model I of Griffing for grain yield, and grain lysine and oil contents. Significant (p < 0.001) interaction was observed between GCA and N levels for grain yield, indicating the selection of different lines for each N level. This interaction was not significant for lysine content, but there were significant effects of GCA for this trait at both N levels (p < 0.1). Significant effects were not observed for GCA or SCA for oil content, however a positive correlation was observed between lysine and oil contents in the hybrids, in the lines and even in the control cultivars. The results indicate the effectiveness of selection for lysine content, irrespective of N level, in the studied non-opaque maize lines, and the possibility of achieving both high lysine and oil content in grains.

scholarly journals The Use of Germination Indices for Salinity Tolerance Classification of Pepper Cultivars

2019 ◽  
Vol 7 (9) ◽  
pp. 1304
Author(s):  
Gamze Kaya
Keyword(s):  
Salinity Tolerance ◽  
Seedling Growth ◽  
Growth Parameters ◽  
Genotypic Variation ◽  
Germination Percentage ◽  
Control Treatment ◽  
Tolerance Index ◽  
Seedling Length ◽  
Early Seedling ◽  
Germination Indices

The study aimed to evaluate the use of germination indices as a screening tool for salinity tolerance during germination and early seedling growth of pepper cultivars, and to distinguish the potential for genetic responses to salt tolerance. In the study, the seeds of seven pepper cultivars were germinated at increasing NaCl levels of 5, 10, 15 and 20 dS/m and distilled water as the control treatment for 14 days. Germination percentage (GP), mean germination time (MGT), germination index (GI), germination stress tolerance index (GSTI), seedling length (SL), seedling fresh weight (SFW) and vigor index (VI) were investigated. Results showed that germination percentage decreased with increasing NaCl levels while the highest germination percentage at 20 dS/m was 92% in BT Burdem with no significant reduction. Seedling growth of pepper cultivars was severely inhibited by increasing salinity stress. SFW was depressed depending on reduction in SL due to increasing NaCl. BT-Burli and BT İnce Sivri were the most tolerant cultivars to NaCl and they were used for genetic resources towards salinity. Seedling growth was much more sensitive to salinity than germination because of the highest percent reduction in seedling growth parameters. Among the parameters, GSTI gave the highest significant correlation coefficient with SL and SFW; indicating that it would be useful for estimating seedling growth. It was concluded that genotypic variation was observed among pepper cultivars for salinity tolerance and GSTI could be used for a predictor for salinity tolerance.

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