نهمین کنفرانس ملی و اولین کنفرانس بین المللی فیزیولوژی گیاهی

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کد مقاله 1348

عنوان Genetic Architecture and Physiological Strategies in Canola: Multivariate Analysis Reveals Distinct Water-Use Efficiency Mechanisms for Targeted Breeding

نویسندگان Hosein Samadieh - Ali Naserzadeh - Danial Movahedi Sichani

چکیده Understanding the genetic basis of physiological diversity is critical for breeding climate-resilient cultivars. In this study, principal component analysis (PCA) and hierarchical clustering were used to analyze genetic variation in photosynthetic efficiency and water use among nine canola genotypes under optimal conditions. Nine physiological and agronomic traits were evaluated. PCA showed that the first two components accounted for 66.87% of the total variation, indicating that genetic diversity is primarily governed by two major systems: photosynthetic–stomatal regulation and growth–yield allocation. Hierarchical clustering classified genotypes into four distinct physiological groups: a balanced efficiency group (G1, G2, G8, G9), a high-efficiency group (G3), a high-photosynthesis group (G4, G6, G7), and a high-transpiration group (G5). The largest Euclidean distance (7.514) between the high-efficiency and high-transpiration clusters highlighted fundamental trade-offs between resource-use efficiency and metabolic dissipation. Genotype G3 exhibited a unique genetic architecture, combining high photosynthetic efficiency, low water loss, and a superior harvest index (36.75%), making it a strong candidate for breeding programs targeting drought tolerance and yield stability. Overall, this multivariate approach clarifies genotype–phenotype relationships and supports rational parent selection for environment-specific breeding strategies.

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