Agronomic potential of genetically diverse narrow-leafed lupins (Lupinus angustifolius L.) with restricted branching

2003 ◽  
Vol 54 (7) ◽  
pp. 649 ◽  
Author(s):  
N. W. Galwey ◽  
K. Adhikari ◽  
M. Dracup ◽  
R. Thomson
Keyword(s):  
Grain Yield ◽  
Western Australia ◽  
Genetic Background ◽  
Grain Filling ◽  
Field Trials ◽  
Main Stem ◽  
Consistent Difference ◽  
Indeterminate Growth Habit ◽  
Agronomic Potential ◽  
Shoot Mass

The indeterminate growth habit of narrow-leafed lupin appears to cause a suboptimal pattern of grain filling in the Mediterranean-type environment of south-western Australia. Development of cultivars with genetically restricted branching (RB) has been proposed to overcome the problem. However, restriction of branching causes profound phenological and architectural changes, and it may be necessary to compensate for these by incorporating RB into a genetic background that confers high shoot mass. In order to make a robust assessment of the value of RB in a range of backgrounds, the trait was incorporated from 5 donor parents into the genetic background of 10 recurrent parents by 2 rounds of back-crossing followed by self-fertilisation of the progeny for 4 generations to produce BC2S4 lines. Thirty-two of these lines were obtained with highly RB or mildly RB, a range of flowering times from 68 to 118 days after sowing, and 16–34 leaf nodes on the main stem. They were tested with their parents in replicated field trials at 3 sites in Western Australia at latitudes from 28°S to 33°S. The RB genotypes generally gave higher grain yield than the normal-branching genotypes at the high-latitude, high-rainfall, long growing season, high shoot mass producing site of Esperance, and the 2 types gave approximately equal yield in the low-latitude, low-rainfall, short-season, low shoot mass site of Mullewa. Only at the intermediate site of Wongan Hills did the normal-branching genotypes have a clear advantage. RB genotypes had higher harvest index than corresponding normal-branching genotypes, particularly at Esperance, and tended to produce more pods but slightly fewer seeds per pod and lighter seeds. There was no consistent difference in performance between highly and mildly RB genotypes, contrary to an expectation that the highly RB type would produce insufficient shoot mass. There was a tentative indication that, within RB lines, a large number of leaf nodes on the main stem conferred more reliably high grain yield in the environments of Esperance and Wongan Hills. Overall, these results provide ample justification for the development and further evaluation of RB cultivars. However, this conclusion comes with 2�caveats: that a different background development pattern should be adopted to that used in normal branching lupins, and that RB cultivars should be evaluated in the target environments where the character confers an advantage.

Grain yield and water use efficiency of early maturing wheat in low rainfall Mediterranean environments

1997 ◽  
Vol 48 (5) ◽  
pp. 595 ◽  
Author(s):  
K. L. Regan ◽  
K. H. M. Siddique ◽  
D. Tennant ◽  
D. G. Abrecht
Keyword(s):  
Grain Yield ◽  
Water Use Efficiency ◽  
Water Use ◽  
Western Australia ◽  
Field Experiments ◽  
Grain Filling ◽  
Commercial Cultivars ◽  
Early Maturing ◽  
Use Efficiency ◽  
Short Season

Wheat cultivars with very early maturities appropriate for late sowings in low-rainfall (<325 mm) short-season environments are currently unavailable to wheat growers in the eastern margin of the cropping region of Western Australia. A demonstration that very early-maturing genotypes can out-perform current commercial cultivars would open new opportunities for breeding programs to select very early-maturing, high- and stable-yielding cultivars for these environments. Six field experiments were conducted over 4 seasons at 2 low-rainfall sites in Western Australia to investigate crop growth, grain yield, and water use efficiency of very early-maturing genotypes compared with current commercial cultivars when sown after 1 June. Very early-maturing genotypes reached anthesis up to 24 days (328 degree-days) earlier than the current cultivars, produced less leaves, had similar yields and dry matter, and maintained high water use efficiencies. On average across seasons and locations the very early-maturing genotypes (W87–022–511, W87–114–549, W87–410–509) yielded more than the later maturing cultivars Gamenya and Spear (190 v. 160 g/m2) but they were similar to the early-maturing commercial cultivars Kulin and Wilgoyne (191 g/m2). Very early-maturing genotypes generally had a higher harvest index and produced fewer spikelets, but heavier and more grains, than Kulin and Wilgoyne. There were only small differences in total water use between very early-maturing genotypes and commercial cultivars; however, very early-maturing genotypes used less water in the pre-anthesis period and more water in the post-anthesis period than the later maturing genotypes, and hence, experienced less water deficit during the grain-filling period. This study indicates that there is a role for very early-maturing genotypes in low-rainfall short-season environments, when the first autumn rains arrive late (after 1 June).

Source - sink balance and manipulating sink - source relations of wheat indicate that the yield potential of wheat is sink-limited in high-rainfall zones

2010 ◽  
Vol 61 (10) ◽  
pp. 852 ◽  
Author(s):  
Heping Zhang ◽  
Neil C. Turner ◽  
Michael L. Poole
Keyword(s):  
Grain Yield ◽  
Western Australia ◽  
Unit Area ◽  
Grain Filling ◽  
Yield Potential ◽  
Limiting Factor ◽  
Wheat Cultivars ◽  
High Rainfall ◽  
Sink Size ◽  
Source Sink

Grain yield depends on the number of grains per unit area (sink) and the availability of assimilates (source) to fill these grains. The aim of the current work was to determine whether wheat yield in the high-rainfall zone of south-western Australia is limited in current cultivars by the size of the sink or by the assimilates available for grain filling. Three wheat cultivars (Calingiri, Chara and Wyalkatchem) and two breeding lines (HRZ216 and HRZ203) were grown in four replicates in the field from 2005 to 2007. Dry matter and water soluble carbohydrates (WSC) at anthesis and maturity were measured and used to determine the source and sink balance of the crop. In 2007, three further treatments were applied to manipulate the sink–source relationships: (i) spikelets were removed on main stems to increase the source : sink ratio; (ii) incoming solar radiation was reduced by 40% by shading after anthesis to reduce the availability of assimilates to grains; and (iii) supplemental irrigation was used to maintain the capacity for photosynthesis by an improved water supply during grain filling. The source–sink balance of the crops showed that the potential source was 25% greater than the actual grain yield in average and above-average seasons (2005 and 2007), suggesting that sink size, represented by the number of grain per unit area, was a limiting factor to yield potential. However, the source may have become a limiting factor in a drought season (2006). The grain yield increased with increased number of grains/m2 and kernel weight remained relatively stable even when grain number increased from 7000 to 16 000 per m2. The removal of half of the spikelets on the main stem did not increase kernel mass of the remaining grains and an additional 33 mm of irrigation water did not increase grain yield, but significantly (P < 0.05) increased WSC left in stems and leaf sheaths at maturity. Shading after anthesis did not significantly reduce grain yield of the current cultivars Calingiri and Wyalkatchem, but it reduced grain yield by 23–25% (P < 0.05) in Chara and HRZ203. The source–sink balance over three seasons and three independent experiments in 2007 suggested that the yield of the current wheat cultivars is more sink- than source-limited and that breeding wheat with a larger sink size than in the current cultivars may lift the yield potential of wheat in the high-rainfall zone of south-western Australia.

Yield improvement and associated characteristics of some Australian spring wheat cultivars introduced between 1860 and 1982

1989 ◽  
Vol 40 (3) ◽  
pp. 457 ◽  
Author(s):  
MW Perry ◽  
MF D'Antuono
Keyword(s):  
Grain Yield ◽  
Western Australia ◽  
Harvest Index ◽  
Triticum Aestivum L ◽  
Field Trials ◽  
Grain Weight ◽  
Yield Potential ◽  
Rate Of Increase ◽  
Australian Wheat ◽  
1000 Grain Weight

Twenty-eight Australian wheat (Triticum aestivum L. em. Thell.) cultivars representing a series from the 1860s to 1982, were grown in 20 field trials over four years in the wheatbelt of Western Australia. The cultivars included introductions and selections made before 1900, plus important cultivars bred or grown in Western Australia up to 1982. Five of the latter group were from crosses including semidwarf cultivars as parents. Grain yields were measured on all trials, and six trials were also sampled for biomass and yield components.Based on the regression of mean grain yield versus the number of years elapsed since 1884, yields have increased from 1022 kg ha-1 in 1884 to 1588 kg ha-1 in 1982. This represents a rate of increase of 5.8 kg ha-1 year-1 or 0.57% per year. Regression of cultivar yield on site mean yield gave values of b, the slope of the regression, from 0.66 to 1.24, and these were higher for modern than for old cultivars.In six trials sampled for yield components, above-ground biomass appeared to have increased slightly when comparing early selections and their derivatives with later cultivars, but over 80% of the overall increase in grain yield was due to increase in harvest index. Grains per car and grains m-2 were strongly and positively correlated with grain yield, but there were weak negative correlations between 1000-grain weight and yield, and between 1000 grain weight and years since 1884. Cultivars with a semi-dwarf background had equal biomass, but higher yield, harvest index, ear number m-2 and grains ear-2 than modern tall cultivars. The results show that genetic improvement has substantially increased yield potential in this environment and that this has been achieved through substantial increases in grain number m-2 associated with an improvement in harvest index.

scholarly journals Evaluation of rice grain yield and yield components of Nona Bokra chromosome segment substitution lines with the genetic background of Koshihikari, in a saline paddy field

AoB Plants ◽  
2019 ◽  
Vol 11 (5) ◽  
Author(s):  
Shiro Mitsuya ◽  
Norifumi Murakami ◽  
Tadashi Sato ◽  
Tomohiko Kazama ◽  
Kinya Toriyama ◽  
...  
Keyword(s):  
Grain Yield ◽  
Paddy Field ◽  
Yield Components ◽  
Genetic Background ◽  
Grain Filling ◽  
Growth Stages ◽  
Substitution Lines ◽  
Chromosome Segment Substitution Lines ◽  
Yield And Yield Components ◽  
Segment Substitution

Abstract The ability to tolerate salt differs with the growth stages of rice and thus the yield components that are determined during various growth stages, are differentially affected by salt stress. In this study, we utilized chromosome segment substitution lines (CSSLs) from Nona Bokra, a salt-tolerant indica landrace, with the genetic background of Koshihikari, a salt-susceptible japonica variety. These were screened to find superior CSSLs under long-term saline conditions that showed higher grain yield and yield components in comparison to Koshihikari. One-month-old seedlings were transplanted into a paddy field without salinity. These were allowed to establish for 1 month further, then the field was flooded, with saline water maintained at 7.41 dS m−1 salinity until harvest. The experiments were performed twice, once in 2015 and a targeted study in 2016. Salt tolerance of growth and reproductive stage parameters was evaluated as the Salt Effect Index (SEI) which was computed as the difference in each parameter within each line between control and saline conditions. All CSSLs and Koshihikari showed a decrease in grain yield and yield components except panicle number under salinity. SL538 showed a higher SEI for grain yield compared with Koshihikari under salinity throughout the two experiments. This was attributed to the retained grain filling and harvest index, yet the mechanism was not due to maintaining Na+, Cl− and K+ homeostasis. Few other CSSLs showed greater SEI for grain weight under salinity compared with Koshihikari, which might be related to low concentration of Na+ in leaves and panicles. These data indicate that substitution of different Nona Bokra chromosome segments independently contributed to the maintenance of grain filling and grain weight of Koshihikari under saline conditions.

scholarly journals Using NDVI to Differentiate Wheat Genotypes Productivity Under Dryland and Irrigated Conditions

2020 ◽  
Vol 12 (5) ◽  
pp. 824 ◽  
Author(s):  
Mohammed Naser ◽  
Raj Khosla ◽  
Louis Longchamps ◽  
Subash Dahal
Keyword(s):  
Grain Yield ◽  
Growth Stage ◽  
Grain Filling ◽  
Growing Season ◽  
Triticum Aestivum L ◽  
Field Trials ◽  
Clustering Method ◽  
Wheat Genotypes ◽  
Normalized Difference Vegetative Index ◽  
Reliable Correlation

Crop breeders are looking for tools to facilitate the screening of genotypes in field trials. Remote sensing-based indices such as normalized difference vegetative index (NDVI) are sensitive to biomass and nitrogen (N) variability in crop canopies. The objectives of this study were (i) to determine if proximal sensor-based NDVI readings can differentiate the yield of winter wheat (Triticum aestivum L.) genotypes and (ii) to determine if NDVI readings can be used to classify wheat genotypes into grain yield productivity classes. This study was conducted in northeastern Colorado in 2010 and 2011. The NDVI readings were acquired weekly from March to June, during 2010 and 2011. The correlation between NDVI and grain yield was determined using Pearson’s product-moment correlation coefficient (r). The k-means clustering method was used to classify mean NDVI and mean grain yield into three classes. The overall accuracy between NDVI and yield classes was reported. The findings of this study show that, under dryland conditions, there is a reliable correlation between grain yield and NDVI at the early growing season, at the anthesis growth stage, and the mid-grain filling growth stage, as well as a poor association under irrigated conditions. Our results suggest that when the sensor is not saturated, i.e., NDVI < 0.9, NDVI could assess grain yield with fair accuracy. This study demonstrated the potential of using NDVI readings as a tool to differentiate and identify superior wheat genotypes.

scholarly journals Combined application of biochar and nitrogen fertilizer promotes the activity of starch metabolism enzymes and the expression of related genes in rice in a dual cropping system

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Izhar Ali ◽  
Saif Ullah ◽  
Anas Iqbal ◽  
Zhao Quan ◽  
He Liang ◽  
...  
Keyword(s):  
Grain Yield ◽  
Starch Content ◽  
Cropping System ◽  
Grain Filling ◽  
Field Trials ◽  
Fertilizer Application ◽  
Rice Grain ◽  
N Application ◽  
Metabolism Enzymes

Abstract Background Overuse of chemical fertilizer highly influences grain filling rate and quality of rice grain. Biochar is well known for improving plant growth and grain yield under lower chemical fertilization. Therefore field trials were conducted in the early and late seasons of 2019 at Guangxi University, China to investigate the effects of combined biochar (B) and nitrogen (N) application on rice yield and yield components. There were a total of eight treatments: N1B0, 135 kg N ha− 1+ 0 t B ha− 1; N2B0,180 kg N ha− 1+ 0 t B ha− 1; N1B1,135 kg N ha− 1+ 10 t B ha− 1; N1B2,135kg N ha− 1+ 20 t B ha− 1; N1B3,135 kg N ha− 1+ 30 t B ha− 1; N2B1,180 kg N ha− 1+ 10 t B ha− 1; N2B2,180 kg N ha− 1+ 20 t B ha− 1; and N2B3,180 kg N ha− 1+ 30 t B ha− 1. Results Biochar application at 30 t ha− 1combined with low N application (135 kg ha− 1) increased the activity of starch-metabolizing enzymes (SMEs) during the early and late seasons compared with treatments without biochar. The grain yield, amylose concentration, and starch content of rice were increased in plots treated with 30 t B ha−1and low N. RT-qPCR analysis showed that biochar addition combined with N fertilizer application increased the expression of AGPS2b, SSS1, GBSS1, and GBSE11b, which increased the activity of SMEs during the grain-filling period. Conclusion Our results suggest that the use of 20 to 30 t B ha− 1coupled with 135 kg N ha− 1 is optimal for improving the grain yield and quality of rice.

scholarly journals Effect of light intensity after flowering on the productivity and quality of silage maize.

1982 ◽  
Vol 30 (4) ◽  
pp. 297-316
Author(s):  
P.C. Struik ◽  
B. Deinum
Keyword(s):  
Cell Wall ◽  
Light Intensity ◽  
Grain Yield ◽  
Grain Filling ◽  
Growing Season ◽  
Field Trials ◽  
Silage Maize ◽  
Effect Of Light

In field trials during 1977-9, maize was grown under shade conditions at various stages of development. Grain yield was correlated with irradiance received during grain filling and was increased by 10 kg/ha for every MJ/m2 at full light intensity when density was not limiting. In vitro OM digestibility and cell wall content decreased with shading during the latter part of the growing season. Shading also altered ensiling qualities. A hypothesis is formulated to account for the effect of shading on ear size, ear growth and leaf longevity in terms of the prompt effects of shading on root activity. (Abstract retrieved from CAB Abstracts by CABI’s permission)

SEEDING RATE EFFECTS ON LOW-TILLERING SPRING WHEATS IN A SEMIARID ENVIRONMENT

1990 ◽  
Vol 70 (1) ◽  
pp. 9-17 ◽  
Author(s):  
P. HUCL ◽  
R. J. BAKER
Keyword(s):  
Grain Yield ◽  
Maximum Yield ◽  
Triticum Aestivum L ◽  
Field Trials ◽  
Main Stem ◽  
Seeding Rate ◽  
Grain Yields ◽  
Rate Effects ◽  
High Tillering ◽  
Plot Design

To determine if increased seeding rates would alter relative yields of traditional and low-tillering genotypes, a high-tillering (Neepawa), a low-tillering (Siete Cerros), and an oligoculm (M1417) spring wheat (Triticum aestivum L.) genotype were seeded in replicated field trials at two locations in 1984 and 1985. A four-replication split-plot design, with genotypes assigned to main plots and seeding rates (40, 80 160, 320 and 640 seeds m−2) to subplots, was used for each experiment. Grain yield and its components were measured on individual plots or on main stems of five plants in each plot. All three genotypes expressed maximum yield at the same seeding rate (640 seeds m−2 in 1984 and 320 seeds m−2 in 1985) in the semiarid conditions of these experiments. Despite diverse tillering habits, the relative yields of these three genotypes could not be altered by changing seeding rates. On average, Siete Cerros (low-tillering) yielded 15% more than Neepawa and 17% more than M1417. Neepawa had lower grain yields than M1417 at all seeding rates in 1984, but higher grain yields in 1985. A similar change in relative performance of these two genotypes was observed for harvest index of the main stem but not for main stem grain yield kernels spike −1 on the main stem or kernel weight.Key words: Wheat (spring), oligoculm, yield components, genotype-environmental interaction.

The effect of inoculum distribution and sowing depth on Pleiochaeta root rot of lupins

1991 ◽  
Vol 42 (1) ◽  
pp. 121 ◽  
Author(s):  
MW Sweetingham
Keyword(s):  
Grain Yield ◽  
Western Australia ◽  
Root Rot ◽  
Surface Soil ◽  
Field Trials ◽  
Sowing Depth ◽  
History Of

In paddocks with a history of previous lupin cultivation, propagules of the fungus Pleiochaeta setosa are most concentrated in the top 2 cm of soil and rapidly decline to zero at the base of the tillage layer (10-14 cm). The severity of Pleiochaeta root rot is greatly reduced as sowing depth increases, due to avoidance of the concentrated surface soil borne inoculum. Hypocotyls are not infected by P. setosa, enabling disease escape. In four field trials over three seasons, optimum establishment and grain yield occurred at sowing depths close to 5 cm, deeper than previously recommended for lupins in Western Australia.

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