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Introduction of dry yield-related traits to screen low-irrigation tolerant ecotypes in alfalfa (Medicago sativa L) | ||
| Desert | ||
| دوره 29، شماره 1، شهریور 2024، صفحه 89-100 اصل مقاله (944.33 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/jdesert.2024.98234 | ||
| نویسندگان | ||
| Sayyed Saeed Moosavi* 1؛ Leyla Ahmadi1؛ Mohammad Souri2؛ Mohammad Reza Abdollahi1 | ||
| 1Department of Plant Production and Genetics, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran | ||
| 2Seed and Plant Research Department, Hamedan Agricultural and Natural Resources Research and Education Center, Hamedan, Iran. | ||
| چکیده | ||
| Alfalfa is one of the most important forage crops in the world and Iran. Due to the adverse effect of drought on alfalfa yield, screening drought- tolerant genotypes is essential in breeding efforts. In the present study, 11 alfalfa ecotypes were evaluated during two years under the low-irrigation stress condition. The statistical analyzes were done on the average of two-years data. The first and second factors, respectively as "forage- quantity factor" and "forage-quality factor", explained 70.40% of the data total variance. Factor analysis showed that, the traits of fresh-forage yield, plant height, stem fresh weight and regrowth rate, had the most positive effect on dry-forage yield, respectively. Qharaghezlou ecotype with the highest dry-forage yield, and Sedghiyan ecotype, with the highest forage quality, were the most drought-tolerant and high-quality ecotypes, respectively. Ecotypes of Mohajeran and Famenein showed the lowest dry-forage yield. Ecotypes were grouped in three separate clusters. The first and third clusters were identified as "dry-forage quality" and "dry-forage quantity" cluster, respectively. These two clusters had the highest genetic distance. Correctness of cluster grouping was confirmed by the discriminant function analysis. Fresh-forage yield, dry to fresh-forage yield ratio, plant height and regrowth rate were entered into the regression model respectively, as the most important traits affecting on dry-forage yield. The traits of fresh-forage yield and dry to fresh-forage yield ratio showed the most positive direct effect on dry-forage yield. Also, plant height, through increasing fresh-forage yield, and regrowth rate, through decreasing the dry to fresh forage yield ratio, had the largest positive and negative indirect effects on dry-forage yield, respectively. According to the results, the ecotypes showed a high diversity, which suggests the use of desirable traits and superior genotypes identified for use in future alfalfa breeding programs. | ||
| کلیدواژهها | ||
| Alfalfa؛ Factor analysis؛ Cluster analysis؛ Discriminant function analysis؛ Stepwise regression؛ Causality analysis | ||
| مراجع | ||
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