Performance of Rapeseed (Brassica napus L.) Hybrids and Parental Mutant Lines in Three Environments
Thagana, W. M.
MetadataShow full item record
Commercial hybrids of rapeseed have been developed due to inherent and exploitable heterosis for yield and agronomic traits. The objective of the present study was to compare the performance of hybrids derived from cytoplasmic-genetic male sterility, cultivars and mutant lines of rapeseed. Twenty six entries of rapeseed comprising of mutant hybrids, cytoplasmic-genetic male sterility hybrids, intercultivar hybrids and parents were planted in 2-metre long single rows at 30-cm spacing in randomized complete block design, with 3 replicates at Njoro, Mau Narok and Molo in 2006. Data was taken on days to first flowering, days to 50% flowering, plant height, seed yield and 1,000 seed weight. The data were analysed using SAS-General Linear Model and least significant difference was used to separate means. Mutant and intercultivar hybrids out-yielded cytoplasmic male sterility hybrids and parental lines. The mutant lines were the shortest, flowered early and were distinct from their parents. Regent mutant dwarf (RmD) was short and had the heaviest 1,000 seed weight in all the three sites. Mutation was effective in creating variability and heterotic lines.