J Integr Plant Biol. ›› 2011, Vol. 53 ›› Issue (5): 338-346.DOI: 10.1111/j.1744-7909.2011.01038.x

Special Issue: Rice Genomics and Agriculture

• Cell and Developmental Biology •     Next Articles

Genetic Analysis of Two Weak Dormancy Mutants Derived from Strong Seed Dormancy Wild Type Rice N22 (Oryza sativa)

Bingyue Lu1, Kun Xie1, Chunyan Yang1, Long Zhang1, Tao Wu1, Xi Liu1, Ling Jiang1* and Jianmin Wan1,2*   

  1. 1National Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing 210095, China
    2National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Abstract:

Two weak dormancy mutants, designated Q4359 and Q4646, were obtained from the rice cultivar N22 after treatment with 400 Gy 60Co gamma-radiation. Compared to the N22 cultivar, the dormancy of the mutant seeds was more readily broken when exposed to a period of room temperature storage. The mutants also showed a reduced level of sensitivity to abscisic acid compared to the N22 cultivar, although Q4359 was more insensitive than Q4646. A genetic analysis indicated that in both mutants, the reduced dormancy trait was caused by a single recessive allele of a nuclear gene, but that the mutated locus was different in each case. The results of quantitative trait locus (QTL) mapping, based on the F2 population from Q4359 x Nanjing35, suggested that Q4359 lacks the QTL qSdn-1 and carries a novel allele at QTL qSdn-9, while a similar analysis of the Q4646 x Nanjing35 F2 population suggested that Q4646 lacks QTL qSdn-5, both qSdn-1 and qSdn-5 are major effect seed dormancy QTL in N22. Therefore, these two mutants were helpful to understand the mechanism of seed dormancy in N22.

Lu B, Xie K, Yang C, Zhang L, Wu T, Liu X, Jiang L, Wan J (2011) Genetic analysis of two weak dormancy mutants derived from strong seed dormancy wild type rice N22 (Oryza sativa). J. Integr. Plant Biol. 53(5), 338–346.

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