Assessment of genetic variation in sainfoin landraces based on agronomic characteristics using a genotype-by-trait biplot model

A mini collection comprising ۳۲ sainfoin genotypes was cultivated using a randomized complete block design with four replicates. Various parameters were recorded, including the number of plants per area (NPA), total dry yield (TDY), thousand seed weight (TSW), number of main stems (NMS), petiole length (PL), length of inflorescence (LI), number of leaflets per leaf (NLL), leaves per main stem (LMS), number of leaves per stem (NLS), stem dry weight (SDW), leaf dry weight (LDW), inflorescence dry weight (IDW), and number of florets per inflorescence (NFI). The first and second components of the biplot accounted for ۸۸% of the variability in the dataset, with ۷۰% attributed to the first component and ۱۸% to the second. A pentagon was identified, featuring two distinct sections with genotypes ۱۶ and ۲۵, as well as genotype ۱۴, serving as vertex entries. Notably, genotype ۱۴ (Azna) excelled in three traits: NLL, LMS, and NLS. Additionally, vertex genotypes ۱۶ and ۲۵ demonstrated superior performance in other measured traits, including economically significant traits such as total dry yield. In accordance with the ideal entry, genotypes ۱۳, ۱۴, and ۱۹, along with genotypes ۱۶ and ۲۵, exhibited greater favorability compared to other sainfoin genotypes regarding variability in the measured traits. Based on the ideal tester, total dry yield, number of leaves per stem, and number of florets per inflorescence were identified as key factors for assessing variation among genotypes. An examination of genotypes based on total dry yield indicated that genotypes ۱۶ and ۲۵, followed by genotypes ۱۴ and ۱۶, were the most desirable.

کلیدواژه ها:

Forage yield ، Genetic diversity ، ideal entry ، ideal tester