Study on genetic architechture of selected rice cultivars for blast resistance and its componenets.
2007
Mo`meni, Ali | Nuruzi, Mohammad | Katuzi, Mahnaz | Musa Nezhad, Sadiqeh | Habibi, Fatemeh | Khosravi, Vahid
Characterizing of genetic architechture of different traits inluding inheritance, gene action and partitioning of phenotypic variance to it' components are one of the major issues in plant breeding. Hence, to study genetic architecture of resistance of rice to blast disease and other important quality and agronomic traits, five diverse rice genotypes viz. Neda, Dasht, Domsiah, SHZ2 and Ahlami-tarom has been selected and all cross combinations has been made among them (a half-diallel). All genotypes including 10 F1 together with their 5 parents, totally 15, have been evaluated in a Randomized Complete Block Design with 3 replications for components of resistance to blast, grain quality characters, some agronomic traits, yields and it' component in Rice Research Institute of Iran in Rasht and Amol during 2004-2006. Analysis of variance showed that there was significantly difference among all rice cultivars and their cross combinations for all traits. Combining ability analysis based on Method II and Model Mixed B (Griffing 1956) revealed that mean of squares for GCA and SCA were significantly difference, hence both additive and non-additive components of genetic variance were important in controlling of traits. For most of traits additive components was predominant but for yield, number of tiller and gel temperature non-additive genetic variance was predominant. Cultivars Neda, Dasht and SHZ2 were good combiner for increasing resistance to blast disease, yield and its componens. Most of combinations showed high significant SCA for components of resistance. Cross combinations including Domsiah/Neda, Neda/Ahlami-tarom and Dasht/Ahlami-tarom showed the best sca for yield and some of its component. Genetic analysis through Hayman (1954) also proved the results of Griffing' method.
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