scholarly journals Breeding sunflower cultivars for the northern latitudes

1988 ◽  
Vol 60 (4) ◽  
pp. 255-259
Author(s):  
Walter Dedio
Keyword(s):  
Gene Pool ◽  
Inbred Lines ◽  
Row Spacing ◽  
Male Sterile ◽  
Higher Plant ◽  
Good Source ◽  
Fertility Restorer ◽  
Lodging Resistance ◽  
Northern Latitudes ◽  
Narrow Row

Development of short season sunflower hybrids has been the main objective of the Canadian sunflower breeding program. A gene pool created with 50 lines extracted from USSR open-pollinated varieties provided a good source of early inbred lines. The gene pool produced the lines CM447, CM469 and CM497 which were the basis for the superior early parental lines. Another early line, CM594, was extracted from Armavirec. CM447 and CM594 were converted to the cytoplasmic male sterile (cms) form, while CM469 and CM497 were used in the development of fertility-restorer lines. Hybrids from these lines and in combination with HA3O1, HA232, and NS39 resulted in up to 15 days earlier maturity than the standard hybrids, with good oil content, disease resistance and lodging resistance. An early dwarf hybrid. Sunwheat, developed by SeedTec shows good performance in late seeded tests, but it requires higher plant population and a narrow row spacing.

Effects of row spacing on growth and grain yield of early and late sorghum cultivars

1988 ◽  
Vol 28 (6) ◽  
pp. 771 ◽  
Author(s):  
S Fukai ◽  
MA Foale
Keyword(s):  
Water Status ◽  
Dry Weight ◽  
Grain Filling ◽  
Growth And Yield ◽  
Row Spacing ◽  
Higher Plant ◽  
Double Row ◽  
Severe Water Deficit ◽  
Narrow Row ◽  
Sorghum Bicolor L

The effects of row spacing on growth and yield of grain sorghum (Sorghum bicolor (L.) Moench.) were investigated at a constant population density using 5 cultivars of different duration to flowering under dryland conditions in south-eastern Queensland. The row spacings were narrow (0.33 m), standard (1.0 m), and wide-double (1.67 + 0.33 m). Rainfall was plentiful during the tillering and grain filling stages of growth, but a severe water deficit developed at the boot-anthesis stage. The water stress impaired heading and grain set, and grain dry weight was low (40-190 g m-2), with earlier flowering cultivars producing higher yields. There was a cultivar x row spacing interaction for yield; in the earliest flowering cultivar Texas (610SR), which headed before severe stress developed, there was no significant effect of row spacing while in the other cultivars the yield was highest in double row and least in narrow row. There was no detectable difference in soil water available to the plants at any time during growth, but a slightly higher plant water status and faster phenological development in the wider row plants. These responses are related to the fact that the tiller production was least in double row and therefore individual stems had more water available to them.

scholarly journals Extracting female inbred lines from commercial sunflower hybrids

2008 ◽  
Vol 43 (9) ◽  
pp. 1159-1162 ◽  
Author(s):  
Claudio Guilherme Portela de Carvalho ◽  
José Francisco Ferraz de Toledo
Keyword(s):  
Helianthus Annuus ◽  
Inbred Line ◽  
Extraction Methods ◽  
Inbred Lines ◽  
Male Sterile ◽  
Fertility Restorer ◽  
Fertility Restorer Gene ◽  
Line Extraction ◽  
Rf Gene ◽  
Labor Consuming

The objective of this study was to obtain female inbred lines from sunflower (Helianthus annuus) hybrids. A methodology based on altering inbred lines carrying the fertility restorer gene (Rf) obtained from self pollinating hybrids into inbred lines with normal cytoplasm without the Rf gene was described. Further, derived male-sterile inbred lines were developed. The methodology was successfully used to obtain female inbreds from sunflower commercial hybrids. Although more time and labor consuming than the conventional female inbred line extraction methods, this methodology is advantageous in exploiting superior germplasms (commercial hybrids), which prompted us to develop practical procedures to allow its routinely use.

INFLUENCE OF METHODS FOR SELECTION OF PLANTS AND WAYS OF SEEDING ON EFFICIENCY OF ORIGINAL SEEDS OF FLAX-DOLGUNETS GRROWING IN PRIMARY SEED BREEDING

2020 ◽  
Keyword(s):  
Seed Yield ◽  
Control Level ◽  
Row Spacing ◽  
High Germination ◽  
Breeding Efficiency ◽  
Flax Seeds ◽  
Narrow Row ◽  
Seed Propagation ◽  
Selection Of

The results of scientific research are presented, which made it possible to develop less labor-intensive methods for selecting flax plants to grow original (updated) seeds. Studies have shown that a positive selection of tall plants of flax, compared with the accepted counterpart (control), increased seed yield 1.7-1.9 times. Moreover, plant homogeneity according to the main characteristics (height and fiber content in the stem) characterizing the varietal quality of grown seeds turned out to be at the control level. A negative selection, involving the removal of atypical plants, provided an increase in the output volume of seeds compared to the control by 3.9-4.1 times. This selection method did not reduce the varietal quality of seed material compared to the accepted analogue. With both selection methods, after combining typical plants, seeds with the same high germination rates were obtained (96-99 %). The breeding efficiency of the grown flax seeds using narrow-row sowing methods is shown. Studies have established that narrow-row sowing of seeds with a row-spacing of 7.5 and 6.25 cm compared with sowing by a wide-row method significantly increased their yield by 2.8-3.0 and 2.3-3.0 kg / ha, respectively. The greatest influence on the formation of seed yield in narrow-row sowing (6.25 cm) was exerted by the method of sowing, the part of which was 76.1 %. As the length of seed propagation of flax in creased (up to the uterine elite 2 years) in narrow-row sowing (6.25 cm) compared to broad-row, there was no decrease in quality indicators - germination and seed strength.

scholarly journals Mutator-Induced Mutations of the rf1 Nuclear Fertility Restorer of T-Cytoplasm Maize Alter the Accumulation of T-urfl3 Mitochondrial Transcripts

Genetics ◽  
1996 ◽  
Vol 143 (3) ◽  
pp. 1383-1394
Author(s):  
Roger P Wise ◽  
Carren L Dill ◽  
Patrick S Schnable
Keyword(s):  
Pollen Fertility ◽  
Fertility Restoration ◽  
Mitochondrial Rna ◽  
Induced Mutations ◽  
Male Sterile ◽  
Fertility Restorer ◽  
Restorer Genes ◽  
Mitochondrial Transcripts ◽  
Ecori Restriction ◽  
Fertility Restorer Genes

Abstract Dominant alleles of the rf1 and rf2 nuclear-encoded fertility restorer genes are necessary for restoration of pollen fertility in T-cytoplasm maize. To further characterize fertility restoration mediated by the Rf1 allele, 123,500 gametes derived from plants carrying the Mutator transposable element family were screened for rf1-mutant alleles (rf1-m) Four heritable rf1-m alleles were recovered from these populations. Three rf1-m alleles were derived from the progenitor allele Rf1-IAl53 and one was derived from Rf1-Ky21. Cosegregation analysis revealed 5.5- and 2.4kb Mu1-hybridizing EcoRI restriction fragments in all of the male-sterile and none of the male-fertile plants in families segregating for rf1-m3207 and rf1-m3310, respectively. Mitochondrial RNA gel blot analyses indicated that all four rf1-m alleles in male-sterile plants cosegregated with the altered steady-state accumulation of 1.6 and O.6-kb T-urf13 transcripts, demonstrating that these transcripts are Rf1 dependent. Plants carrying a leaky mutant, rf1-m7323, revealed variable levels of Rf1-associated, T-urf13 transcripts and the degree of pollen fertility. The ability to obtain rf1-m derivatives from Rf1 indicates that Rf1 alleles produce a functional gene product necessary for the accumulation of specific T-urf13 transcripts in T-cytoplasm maize.

Production of Cotton on Narrow Row Spacing

1992 ◽  
Vol 35 (4) ◽  
pp. 1109-1112 ◽  
Author(s):  
J. R. Williford
Keyword(s):  
Row Spacing ◽  
Narrow Row

scholarly journals Heterosis in sweet sorghum

2018 ◽  
Vol 53 (5) ◽  
pp. 593-601 ◽  
Author(s):  
Gabrielle Maria Romeiro Lombardi ◽  
Patricia Cardoso Andrade Navegantes ◽  
Carlos Henrique Pereira ◽  
Jales Mendes Oliveira Fonseca ◽  
Rafael Augusto da Costa Parrella ◽  
...  
Keyword(s):  
Sweet Sorghum ◽  
Accumulation Rate ◽  
Diallel Cross ◽  
Soluble Solids ◽  
Male Sterile ◽  
Fertility Restorer ◽  
Juice Extraction ◽  
Per Se ◽  
Solids Content ◽  
Partial Diallel

Abstract: The objective of this work was to evaluate the potential per se of male-sterile and fertility-restorer lines of sweet sorghum (Sorghum bicolor), as well as to detail the heterosis manifested for some traits directly or indirectly related to ethanol production, accumulation rate, and predictability. Evaluations were performed for 20 genotypes, of which 4 are fertility-restorer lines (R), 3 are male-sterile lines (A), and 12 are experimental hybrids (H) resulting from the partial diallel cross between lines A and R, besides a commercial hybrid CV198 used as a check, in four harvest seasons. The experiments were carried out in the municipalities of Lavras and Sete Lagoas, in the state of Minas Gerais, Brazil. The measured traits were plant height, green mass production, juice extraction, total soluble solids content, and megagrams of Brix per hectare. The male-sterile A1 and the fertility-restorer R1 and R3 lines show the best potential per se, considering all traits and their accumulation rate and predictability over harvest times. Heterosis is significant for all traits. The H11, H13, H14, H21, H22, and H33 hybrids are promising because of their better performance per se and higher heterosis.

THE GENETICS OF FERTILITY RESTORATION IN CYTOPLASMIC MALE-STERILE RYE

1979 ◽  
Vol 21 (3) ◽  
pp. 417-422 ◽  
Author(s):  
G. J. Scoles ◽  
L. E. Evans
Keyword(s):  
Secale Cereale ◽  
Fertility Restoration ◽  
Inbred Lines ◽  
Male Sterile ◽  
Male Sterile Line ◽  
Cytoplasmic Male Sterile ◽  
Restorer Genes ◽  
Secale Cereale L ◽  
Partial Fertility

Three inbred lines of rye (Secale cereale L.) known to be capable of restoring fertility to a cytoplasmic male-sterile line were crossed with the sterile line. The proportions of male fertile, partially male fertile and male sterile plants in F2 and backcross progenies indicated that three dominant restorer genes were present in each line. These were designated Rf1, Rf2 and Rf3, their relative expressivity was Rf1>Rf2>Rf3. Expressivity was dependent upon environment. Partial fertility occurred when certain genotypes carried two of the three alleles as dominant, but was dependent upon genotype and environment.

Influence of row spacing and cultivar selection on annual ryegrass (Lolium rigidum) control and grain yield in chickpea (Cicer arietinum)

2019 ◽  
Vol 70 (2) ◽  
pp. 140 ◽  
Author(s):  
Gulshan Mahajan ◽  
Kerry McKenzie ◽  
Bhagirath S. Chauhan
Keyword(s):  
Grain Yield ◽  
Cicer Arietinum ◽  
Weed Management ◽  
Integrated Management ◽  
Management Strategies ◽  
Integrated Weed Management ◽  
Row Spacing ◽  
Annual Ryegrass ◽  
Lolium Rigidum ◽  
Narrow Row

Annual ryegrass (ARG) (Lolium rigidum Gaudin) is a problematic weed for chickpea (Cicer arietinum L.) production in Australia. Understanding the critical period of control of ARG in chickpea is important for developing effective integrated management strategies to prevent unacceptable yield loss. Experiments were conducted over 2 years at the research farm of the University of Queensland, Gatton, to evaluate the effect of chickpea row spacing (25 and 75cm) and cultivar (PBA Seamer and PBA HatTrick) and ARG infestation period (from 0, 3 and 6 weeks after planting (WAP), and weed-free) on ARG suppression and grain yield of chickpea. Year×treatment interactions were not significant for any parameter, and none of the treatment combinations showed any interaction for grain yield. Average grain yield was greater (20%) with 25-cm than 75-cm rows. On average, PBA Seamer had 9% higher yield than PBA HatTrick. Average grain yield was lowest in season-long weedy plots (562kg ha–1) and highest in weed-free plots (1849kg ha–1). Grain yield losses were lower when ARG emerged at 3 WAP (1679kg ha–1). Late-emerged ARG (3 and 6 WAP) had lower biomass (4.7–22.2g m–2) and number of spikes (5–24m–2) than ARG that emerged early; at 0 WAP, weed biomass was 282–337g m–2 and number of spikes 89–120m–2. Compared with wide row spacing, narrow row spacing suppressed ARG biomass by 16% and 52% and reduced number of spikes of ARG by 26% and 48% at 0 WAP and 3 WAP, respectively. PBA Seamer suppressed ARG growth more effectively than PBA HatTrick, but only in the season-long weedy plots. Our results imply that in ARG-infested fields, grain yield of chickpea can be increased by exploring narrow row spacing and weed-competitive cultivars. These cultural tools could be useful for developing integrated weed management tactics in chickpea in combination with pre-emergent herbicides.

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