Inheritance of Drought Tolerance Using Six Populations Model in Two Bread Wheat Crosses

Said, Alaa A.; Hefny, Yasser A. M.

doi:10.21608/agro.2021.51233.1239

Cited by 2 publications

(7 citation statements)

References 15 publications

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“…These results showed the attendance of epistasis and the complex genetic model was found to be satisfactory for illustrative the inheritance of the abovementioned characters in the corresponding crosses. These results are in agreement with those obtained by Sultan et al [37] and Said et al [29].…”

Section: Types Of Gene Actionsupporting

confidence: 94%

“…The high significant values of genotypes for DH, DM, PH, SL, NS/P, NG/S, TGW, GY/P, and PC, indicate that the tested six populations for two wheat crosses showed abundant genetic variation for effective selection under both well irrigation and water stress tolerance using agronomic characters and proline content. Wheat researchers [12,18,28,29] reported similar results of high wheat genotype variances in different water regimes, where the selection efficiency and heterosis expression also largely depend upon the genetic variability magnitude present in the wheat populations. Genetic diversities are the first step in a wheat breeding program, thus it is a well-recognized value for researchers [16,30].…”

Section: Mean Squaresmentioning

confidence: 93%

“…The additive gene action (d) and additive × dominance (j) effects displayed positively significant for one or more crosses in all traits under two water environments. The importance of (d) and (j) gene effects in the inheritance of grain yield and its components were found by various wheat researchers [9,29,30,43].…”

Section: Types Of Gene Actionmentioning

confidence: 99%

“…Therefore, heterosis breeding could be possible to the improvement of these traits over hybridization (recombination breeding) followed by selection at later generations to obtain better lines under both good irrigation and drought stress environments and it is suggesting for exploiting dominance gene action (h) and these methods must be followed in the next future study. The various studies exhibited also the complex genetic inheritance of grain yield/plant and its components [20,29,46].…”

Section: Types Of Gene Actionmentioning

confidence: 99%

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Breeding Enrichment of Genetic Variation of Grain Yield and Its Attributes in Bread Wheat under Drought Stress and Well Irrigation

Swelam¹,

Salem²,

Hassan³

et al. 2022

Phyton

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Drought stress (DS) is one of the most critical environmental abiotic stresses for wheat production in the arid environments. Selection of high-yielding genotypes tolerant to DS can play a significant role in mitigation the negative impacts associated with DS. In the present study, generation means analysis (GMA) was used to study the performance of two crosses under well irrigation (WI) and deficit irrigation [cross I (Line 44 × Shandweel-1) and cross II (Line 20 × Sakha 93)]. Significant differences were observed for days to heading (DH), days to maturity (DM), plant height (PH), spike length (SL), number of spikes per plant (NS/P), number of grains per spike (NG/S), thousand-grain weight (TGW), grain yield per plant (GY/P), and proline content (PC) in the six populations of the two crosses within each irrigation level. Cross II had early maturity and the highest PC, NS/P, TGW, and GY/P regardless of the irrigation level. Cross I showed positive significant relative heterosis and heterobeltiosis for GY/P under the two irrigation levels. The inheritance of characters of cross I revealed additive, dominant, and epistatic effects, which varied with trait and stress. Additive genetic effects predominated in DH, SL, and PC, while non-additive were found in DM, NS/P, NG/S, and GY/P. Narrow-sense heritability estimates (h 2 n ) were high for DH and PC, moderate to high for PH and SL, moderate for DM, NG/S, NS/P, and TGW, and low for GY/P . Based on different drought indices the populations BC 1 , BC 2 , F 1 , and P 1 of cross II and BC1 of cross I were more tolerant to drought stress. Therefore, PC, TGW and DH can be used as selection indicators to improve wheat for drought tolerance in early generations and other yield components traits in late generations. The second cross (Line 20 × Sakha 93) shows promise and is of interest to a drought tolerance breeding program, where wheat breeders can use recombinant breeding strategies to construct desirable drought stress genes. Correlation and path coefficient revealed that TGW and PC were the main contributor in grain yield in both environments.

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Section: Types Of Gene Actionsupporting

confidence: 94%

Section: Mean Squaresmentioning

confidence: 93%

Section: Types Of Gene Actionmentioning

confidence: 99%

Section: Types Of Gene Actionmentioning

confidence: 99%

See 2 more Smart Citations

Breeding Enrichment of Genetic Variation of Grain Yield and Its Attributes in Bread Wheat under Drought Stress and Well Irrigation

Swelam¹,

Salem²,

Hassan³

et al. 2022

Phyton

View full text Add to dashboard Cite

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“…However, testers contribute significantly toward total variability during the onset of drought. High treatment variance in different water regimes was also observed by wheat scientists [39]. The phenological traits, i.e., leaf twist, auricle color, auricle hairiness and the number of nodes were not significantly different.…”

Section: Identification Of Mean Differences For Studied Traitsmentioning

confidence: 72%

Exploration of Genetic Pattern of Phenological Traits in Wheat (Triticum aestivum L.) under Drought Stress

Ishaaq¹,

Farooq²,

Tahira³

et al. 2022

Phyton

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Drought is the major detrimental environmental factor for wheat (Triticum aestivum L.) production. The exploration of genetic patterns underlying drought tolerance is of great significance. Here we report the gene actions controlling the phenological traits using the line × tester model studying 27 crosses and 12 parents under normal irrigation and drought conditions. The results interpreted via multiple analysis (mean performance, correlations, principal component, genetic analysis, heterotic and heterobeltiotic potential) disclosed highly significant differences among germplasm. The phenological waxiness traits (glume, boom, and sheath) were strongly interlinked. Flag leaf area exhibits a positive association with peduncle and spike length under drought. The growing degree days (heat-units) greatly influence spikelets and grains per spike, however, the grain yield/plant was significantly reduced (17.44 g to 13.25 g) under drought. The principal components based on eigenvalue indicated significant PCs (first-seven) accounted for 79.9% and 73.9% of total variability under normal irrigation and drought, respectively. The investigated yield traits showed complex genetic behaviour. The genetic advance confronted a moderate to high heritability for spikelets/spike and grain yield/plant. The traits conditioned by dominant genetic

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Inheritance of Drought Tolerance Using Six Populations Model in Two Bread Wheat Crosses

Cited by 2 publications

References 15 publications

Breeding Enrichment of Genetic Variation of Grain Yield and Its Attributes in Bread Wheat under Drought Stress and Well Irrigation

Breeding Enrichment of Genetic Variation of Grain Yield and Its Attributes in Bread Wheat under Drought Stress and Well Irrigation

Exploration of Genetic Pattern of Phenological Traits in Wheat (Triticum aestivum L.) under Drought Stress

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