J Integr Plant Biol. ›› 2006, Vol. 48 ›› Issue (4): -.DOI: 10.1111/j.1744-7909.2006.00247.x

• Research Articles •    

Genotyping the Heading Date of Male-Sterile Rice Line II-32A

Jun-Feng Xu, Ling Jiang, Xiang-Jin Wei, Wei-Wen Zhang, Shi-Jia Liu, Liang-Ming Chen, Chun-Ming Wang, Lin-Guang Luo and Jian-Min Wan   

Abstract: II-32A, an elite male-sterile line of rice (Oryza sativa L.), has been widely used for the production of hybrid rice seed in China. Heading date in most combinations using II-32A shows transgressive inheritance or similarity to the latter parent, but the genotype of II-32A with respect to major genes for heading time is unknown. This limits the further exploitation of this sterile line in breeding and hybrid seed production. Using a number of major gene heading date isogenic lines and heading date QTL near-isogenic lines, we genetically analyzed II-32B under both long- and short-day conditions. We show that II-32B carries two photoperiod-sensitive genes, E1 and E3, a recessive late-heading gene, ef-1, and a photoperiod-sensitive allele, Se-1u. In addition we identified in II-32B a recessive inhibitor for E1 or Se-1n and other modified photoperiod-sensitive genes. The heading-date constitution of II-32A was determined to be E1e2E3Se-1uef-1i-Se-1.(Author for correspondence.E-mail: wanjm@njau.edu.cn)

Key words: heading date, near-isogenic line, photoperiod-sensitive gene, recessive late-heading gene, rice.

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