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

• Published in: 植物学报：英文版 2011, Vol.53 (5), p.338-346
• Main Author: Bingyue Lu KunXie Chunyan Yang Long Zhang Tao Wu Xi Liu Ling Jiang Jianmin Wan
• Format: Article
• Language: English
• Subjects: F2群体; 数量性状位点; 水稻品种; 种子休眠; 突变体; 等位基因; 遗传分析; 野生型
• ISSN: 1672-9072; 1744-7909

Two weak dormancy mutants, designated Q4359 and Q4646, were obtained from the rice cultivar N22 after treatment with 400 Gy 6Co 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.