نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه زراعت و اصلاح نباتات دانشکده کشاورزی دانشگاه تهران. کرج. ایران.
2 مرکز تحقیقات کشاورزی و منابع طبیعی اصفهان، اصفهان، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Salinity stress, a major challenge in wheat production, significantly reduces grain quality and yield by altering grain characteristics. In this study, 320 wheat genotypes (comprising 108 commercial cultivars and 212 Iranian landraces) were evaluated using an alpha-lattice design with two replications. Irrigation water with a salinity of 6 dS/m was used as the baseline (mild salinity), and irrigation water with 10 dS/m was used as the elevated level (high salinity). Grain morphometric characteristics were precisely measured from three views (dorsal, lateral, and ventral) using image processing technology.
Salinity stress caused a significant reduction in thousand-grain weight (28.5%), length (26.3%), width (22.1%), volume (31.7%), and grain deformation ratio. Factor analysis identified four principal components (dimensions, shape, surface roughness, density) that explained 83.5% of the variance. Linear Discriminant Analysis (LDA) classified genotypes into saline and baseline groups with 96% accuracy, indicating the prominent effect of salinity on grain morphology. Strong correlations were revealed between grain thickness and thousand-grain weight (r=0.97) and the key role of grain volume in determining thousand-grain weight (r=0.95). The imaging system used in this study successfully identified salinity-tolerant genotypes, such as 'Owhadi'. Utilizing this technology alongside precise statistical analyses provides an effective method for detecting and selecting tolerant cultivars in breeding programs.
کلیدواژهها [English]
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