Selection of large seed and high yielding lines of bread wheat for drought conditions

2021 ◽  
Vol 11 (4) ◽  
pp. 595-606
Author(s):  
Dilmurodov Sherzod Dilmurodovich ◽  
Shodiyev Sherzod Shomiljonovich ◽  
Abdumajidov Jaloliddin Raxmatullaevich ◽  
Hayitov Azizbek Sherkulovich ◽  
Mavlanov Javokhir Sarvar Ogli
Keyword(s):  
Bread Wheat ◽  
Large Seed ◽  
Drought Conditions ◽  
Selection Of

scholarly journals Mass occurrence and habitat selection of Common Redpolls (Carduelis flammea) after a large seed crop year: snow-covered ground facilitates food access

2021 ◽  
Author(s):  
Svein Dale
Keyword(s):  
Climate Change ◽  
Habitat Selection ◽  
Snow Cover ◽  
Breeding Season ◽  
Boreal Forests ◽  
Large Seed ◽  
Mass Occurrence ◽  
Seed Crops ◽  
Ecosystem Changes ◽  
Selection Of

AbstractIn boreal forests, food supplies typically have cyclic variations, and many species here fluctuate in numbers from year to year. One group of species showing large variations in population size is birds specialized on seeds from masting trees. Here, I analyze spatial patterns of a mass occurrence and habitat selection of the Common Redpoll (Carduelis flammea) during the breeding season in southeastern Norway in 2020 after a year with large seed crops from Norway Spruce (Picea abies) and Downy Birch (Betula pubescens). I found that Common Redpoll numbers increased with elevation and towards the northwest. Numbers were also strongly and positively correlated with snow depth in early April when snow was present mainly above 400 m elevation. Sites with snow cover in early April (30% of all sites) held 96.4% of all individuals recorded. Field observations indicated that Common Redpolls foraged extensively for spruce seeds on the snow until the end of May when young were independent. I suggest that the mass occurrence was due to a unique combination of exceptionally large seed crops of two tree species coinciding in the same year. The masting produced large amounts of food both for overwintering (birch seeds) and for breeding (spruce seeds), and during the breeding season snow cover facilitated access to food resources. Dependency of Common Redpolls on snow cover suggests that climate change may negatively impact some seed-eaters in boreal regions. On the other hand, higher temperatures may induce more frequent masting which may be beneficial for seed-eaters. Thus, climate change is likely to lead to complex ecosystem changes in areas where snow cover may disappear.

scholarly journals Expected genetic gains from mono trait and indexbased selection in advanced bread wheat (Triticum aestivum L.) populations

2020 ◽  
Vol 73 (2) ◽  
pp. 9131-9141
Author(s):  
Zine El Abidine Fellahi ◽  
Abderrahmane Hannachi ◽  
Hamenna Bouzerzour
Keyword(s):  
Grain Yield ◽  
Bread Wheat ◽  
Flag Leaf ◽  
Block Design ◽  
Triticum Aestivum L ◽  
Research Unit ◽  
Kernel Weight ◽  
Wide Range ◽  
Wheat Lines ◽  
Selection Of

This study aimed at evaluating the expected gains from selection obtained based upon direct, indirect, and index-based selection in a set of 599 bread wheat lines. The experiment was carried out at the experimental field of INRAA institute, Setif research unit (Algeria), in a Federer augmented block design including three controls. A wide range of genetic variability was observed among lines for the eleven traits assessed. The results indicated that index-based selection and selection based on grain yield expressed higher expected genetic gain than direct and indirect mono-trait-based selection. The best 15 selected lines exhibited higher grain yield than the control varieties, and they were clustered in three groups that contrasted mainly for the flag-leaf area, thousand-kernel weight, biomass, and harvest index. The index-based selection appears as a useful tool for the rapid selection of early filial generations, enriching selected breeding materials with desirable alleles and reducing the number of years required to combine these traits in elite varieties.

Evaluation and selection of bread wheat (Triticum aestivum L.) for preharvest sprouting tolerance

1995 ◽  
Vol 46 (3) ◽  
pp. 463 ◽  
Author(s):  
RM Trethowan
Keyword(s):  
Bread Wheat ◽  
Seed Dormancy ◽  
Triticum Aestivum L ◽  
Preharvest Sprouting ◽  
First Year ◽  
Falling Number ◽  
Selection For ◽  
Visual Measurements ◽  
Selection Of ◽  
Rain Simulator

This paper examines the success of selection for preharvest sprouting tolerance in white-grained bread wheat using a standard wetting treatment, germination of hand-threshed seed and falling number measurements. The rain simulator was usefull in shifting the population mean of field grown material towards higher levels of tolerance in successive years; however, large genotype x year interactions in material sown under rain protection did not allow accurate assessment of individual genotypes. The most accurate assessments were achieved using falling number measurements (h2 = 80.7%) and hand-threshed seed germinations (h2 = 38.4%), where no genotype x year interactions were recorded. Seed dormancy (determined from hand threshed grain) correlated significantly with change in falling number following 3 days' treatment in the rain simulator ( r = -0-56**). Visual measurements scored in the rain simulator, however, did not correlate significantly with seed dormancy in the first year (r = 0.20) but correlated strongly in the second (r = 0.73***). In comparisons of the same test between years, falling number (without rain treatment) and seed dormancy were significantly correlated (r = 0.68* and 0.90***, respectively), whilst visual scores of sprouting showed no association (r = -0.03).

Improving the Quality of a Groundnut Population in Zambia by Bulk Selection of Seed

1974 ◽  
Vol 10 (3) ◽  
pp. 185-192 ◽  
Author(s):  
R. L. Thomas ◽  
A. J. Prior ◽  
J. E. Grafius
Keyword(s):  
Seed Size ◽  
Total Yield ◽  
Substantial Improvement ◽  
Mass Selection ◽  
Large Seed ◽  
Mean Size ◽  
Pedigree Selection ◽  
Positive Correlations ◽  
Selection Of

SUMMARYSubstantial improvement is reported in a quality measure, large seed size, after only one generation of mass selection from a bulk ‘Chalimbana’ population of Zambian land races of the inbred species Arachis hypogaea L. There were large positive correlations between seed size as planted and the subsequent mean size harvested. Large seed also tended to produce an increased proportion of 2- rather than 3-seeded pods, further improving both crop uniformity and quality. Total yield was unaffected, or possibly even slightly enhanced, by planting larger kernels. The circumstantial advantages of mass as opposed to pedigree selection methods are discussed.

scholarly journals Analysis of Direct and Indirect Selection and Indices in Bread Wheat (Triticum aestivum L.) Segregating Progeny

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Zine El Abidine Fellahi ◽  
Abderrahmane Hannachi ◽  
Hamenna Bouzerzour
Keyword(s):  
Bread Wheat ◽  
Yield Components ◽  
Selection Criteria ◽  
Flag Leaf ◽  
Selection Index ◽  
Triticum Aestivum L ◽  
Indirect Selection ◽  
Selection Methods ◽  
Simultaneous Selection ◽  
Selection Of

Three selection methods including direct and indirect selection along with selection index based on the phenotypic values of eleven traits of agronomic interest were assessed for their application in F4 bread wheat progenies. Significant genetic variation existed among parents and crosses for the traits measured. The following were the most efficient indices for simultaneous selection of superior lines for yield and its components: base index of Williams, followed by the sum of ranks index of Smith and Hazel. The selection-based index provided the highest grain yield gains as compared to the other selection criteria, except for flag leaf area, indicating that the direct and indirect monotrait selection were not appropriate in the situation analyzed in this work. PCA identified Ain Abid × Mahon-Demias, Ain Abid × Rmada, and Ain Abid × El-Wifak as the most promising populations. At 5% selection intensity, the top 30 lines selected were distinguished, in comparison with the standard check Hidhab, by significant improvements in yield and yield components.

scholarly journals Selection of perspective early mutant lines of bean (Phaseolus vulgaris L.) in drought conditions

2021 ◽  
Vol 13 (30) ◽  
pp. 46-52
Author(s):  
Tsvetanka Dintcheva ◽  
◽  
Hriska Boteva ◽  
Nasya Tomlekova ◽  
Slavka Kalapchieva ◽  
...  
Keyword(s):  
Fruit Size ◽  
Vegetable Crops ◽  
Phaseolus Vulgaris L ◽  
Green Beans ◽  
Phenological Data ◽  
Drought Conditions ◽  
Biometric Measurements ◽  
Mutant Lines ◽  
Selection Of ◽  
Plant Length

In 2020 a field experiment was conducted with mutant lines of common bean from M4 generations at the Maritsa Vegetable Crops Research Institute, Plovdiv. The aim of the study was to determine the productivity of plants in drought conditions. Twenty four mutant lines were studied in two variants: optimal (non-treated) and reduced (treated) irrigation regimes. A description of the mutant lines was made according to the following features: color: coloring of the flag; beans - length without beak; bean shape in cross section (through the seed); beans-basic coloring; flowering time. Phenological data were collected for phenophases: budding, flowering, fruit size, consumption and botanical maturity. At consumption maturity, biometric measurements were made of 5 plants per repetition on the following indicators: fresh weight (g) of a plant; number and fresh mass (g) of green beans per plant; length (cm) and width (cm) of beans, total fresh biomass (g). The highest productivity found among the treated plants in consumption maturity were the early mutant lines M 564-193-9-1-1 and 564-193-9-1-2, followed by M 564-190-1-1-1, M 564-110-1-2, and M 564-191-1-1-2, compared to the parent line L 564 and all the rest of early mutant lines. The treated plants developed the phenophases 7-10 days later than those with optimal watering.

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