Study on heterosis and gene action in intraspecific hybrids of upland cotton
2007
A`li Shah, O`mran | Al-Azmani, Musa
In order to study the genetic, combining ability and gene action for yield, yield components, some morphological traits and fiber quality traits, six cotton parent were evaluated in half-diallel crossing system in year 2004. Six parent with 15 hybrids (totally 21 genotypes) were studied in randomized complete block design (RCBD) with three replication at Hashem Abad Cotton Research Station (11 Km North West of Gorgan) in 2005. Some agronomic traits, including yeild, yeild components and some fiber quality traits were evaluated. Analysis of variance indicated significance differences (P0.05 and 0.01) among genotypes for some traits, as earliness, boll weight and some vegetative growth chracters. Based on yield mean comparison (Cok*349)×N:200 and (Asj2*Sealand) ×N:200 were superior hybrids than other parental and hybrids genotypes. Combining ability analysis showed that the additive variances were effective on plant height, number of monopodial branches and earliness, and additive and non additive gene action may important for the boll weight. Estimates of the genetically parameters according to Hayman-Jinks method supported the above results.
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