Genetic Mechanism of Dominant Earliness in Kefeng A, a New Rice Cytoplasmic Male Sterile Line

doi:10.1016/S1672-6308(08)60090-6

Abstract

Abstract: Kefeng A is an early maturing indica cytoplasmic male sterile (CMS) line of rice. Combinations derived from Kefeng A and late maturing indica restorer lines showed dominant earliness to various extents. To understand the genetic basis of dominant earliness, the genotype of photoperiod-sensitive genes in Kefeng A was analyzed using a complete set of heading time near isogenic lines (NILs) EG0 to EG7, ER, LR, T65, T65Eb, T65Ebm, T65m, NIL(Hd1) and NIL(Hd4). Results indicated that Kefeng A contained two dominant photoperiod-sensitive alleles E₁ and Se-1^u on E₁ and Se-1 loci, respectively, and the genotype of photoperiod-sensitivity genes for heading time in Kefeng A was E₁E₁e₂e₂E₃E₃Se-1^uSe-1^uEf-1Ef-1. Based on the detected heading time genotype, in combination with the heading time of Kefeng A and the early maturing phenomenon in its derived F₁hybrids, it is speculated that Kefeng A might carry a dominant inhibitor gene Su-E₁ for the dominant photoperiod- sensitive gene E₁, and a recessive inhibitor gene i-Se-1 for another dominant photoperiod-sensitive gene Se-1. The reason why F₁ hybrids from Kefeng A exhibited early maturing was hereby analyzed and the breeding value of dominant earliness related genes in Kefeng A was discussed.

Key words: dominant earliness, heading time, genotype, genetic mechanism, cytoplasmic male sterile line, rice

XIAO Yu-long, YU Chuan-yuan, LEI Jian-guo, LI Ma-zhong, JIANG Lin, WAN Jian-min. Genetic Mechanism of Dominant Earliness in Kefeng A, a New Rice Cytoplasmic Male Sterile Line[J]. RICE SCIENCE, 2009, 16(4): 267-273 .

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