ارزیابی عملکرد، اجزای عملکرد و زودرسی در ژنوتی پهای شش گونه جنس براسیک ا

Assessment of Yield, Yield Components and Earlymaturing in Six Species of Brassica.

Objective: considering the importance of early maturityin canola, this research was carried out in order to identify important agronomic traits related to seed yield and to early with high-yielding cultivars in Brassica genus. Methods: The genetic materials examined in this research included 100 genotypes of six species of Brassica genus (B. napus, B. juncea, B. nigra, B. rapa, B. carinata and B. oleracea) were planted in two repetitions in the form of a lattice square design in the research fields of University of Agricultural Sciences and Resources Natural Sari. Results: The results of variance analysis showed that the studied genotypes have very significant differences with each other in terms of all agricultural traits. The results of mean comparison showed that genotypes from B. napus species has the highest yield and genotypes from B. rapa species has the shortest days to ripening with the lowest yield. The analysis of genetic correlations for all species revealed that yield of seed had a significant positive correlation with days to ripening, silique number per plant, thousand grian weight and grian number in silique. Results of stepwise regression analysis revealed that silique number per plant, 1000-grain weight, number of silique per plant and days to maturity had significantly effects on grain yield. The result of factor analysis showed three independent factors that explained 92% of the total variability, which were named 'productivity', 'phenology', and 'thousand grian weight', respectively. Conclusion: According to all three factors, B. napus, best species and Janetzika, Liragold, Hayola 401andHayola 308 from B. napus species, were identified as the best cultivars concerning seed yield and early maturity. [ABSTRACT FROM AUTHOR]

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