科研之友
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摘要
Development of versatile hybrids has been one of the leading objectives of Plant breeders. Difficulties have been observed in the development of F-1 Cotton hybrids thereby triggering the possible utilization of F-2 hybrids for commercial cultivation. An experiment was conducted to determine the heterotic behavior of F-1 and F-2 hybrids. Twelve lines were crossed with four testers for development of 48 hybrids followed by selfing for the generation of F-2 hybrids. Z33 x IUB09 and CIM473 x IUB08 were outstanding F-1 hybrids while Z33 x IUB09 and CRSM2007 x IUB09 were superior hybrid combinations in F-2. Both F-1 and F-2 hybrids performed extraordinarily well for all of the traits studied in present experiment and incurred mild inbreeding depression in F-2 population. In addition to the F-1 and F-2 population analysis, selected elite hybrids performed significantly higher than three commercial varieties and among them Z33x IUB09 was top yielder followed by CRSM2007 x IUB09 and CIM496 x IUB09. Superior hybrids manifested the predominant influence of non-additive gene action other than dominance coupled with best hormonal combinations. It is inferred that Z33 x IUB09 performed well not only in F-1 and F-2 populations but in field comparison as well. Such hybrids must be extracted by breeding efforts and could be launched for commercial cultivation.
- 出版日期2015-6
