Fine mapping and candidate gene analysis of <Emphasis Type="Italic">ptgms2-1</Emphasis>, the photoperiod-thermo-sensitive genic male sterile gene in rice (<Emphasis Type="Italic">Oryza sativa</Emphasis> L.) |
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Authors: | Jianjun Xu Baohe Wang Yinhui Wu Peina Du Jun Wang Man Wang Chuandeng Yi Minghong Gu Guohua Liang |
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Institution: | (1) Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of the Ministry of Education for Plant Functional Genomics, Yangzhou University, 88 Daxue Road, 225009 Yangzhou, Jiangsu Province, People’s Republic of China;(2) Lixiahe Region Agricultural Research Institute of Jiangsu, 225007 Yangzhou, People’s Republic of China; |
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Abstract: | Photoperiod-thermo-sensitive genic male sterile (PTGMS) rice exhibits a number of desirable traits for hybrid rice production.
The cloning genes responsible for PTGMS and those elucidating male sterility mechanisms and reversibility to fertility would
be of great significance to provide a foundation to develop new male sterile lines. Guangzhan63S, a PTGMS line, is one of
the most widely used indica two-line hybrid rice breeding systems in China. In this study, genetic analysis based on F2 and BC1F2 populations derived from a cross between Guangzhan63S and 1587, determined a single recessive gene controls male sterility
in Guangzhan63S. Molecular marker techniques combined with bulked-segregant analysis (BSA) were used and located the target
gene (named ptgms2-1) between two SSR markers RM12521 and RM12823. Fine mapping of the ptgms2-1 locus was conducted with 45 new Insertion–Deletion (InDel) markers developed between the RM12521 and RM12823 region, using
634 sterile individuals from F2 and BC1F2 populations. Ptgms2-1 was further mapped to a 50.4 kb DNA fragment between two InDel markers, S2-40 and S2-44, with genetic distances of 0.08 and
0.16 cM, respectively, which cosegregated with S2-43 located on the AP004039 BAC clone. Ten genes were identified in this
region based on annotation results from the RiceGAAS system. A nuclear ribonuclease Z gene was identified as the candidate
for the ptgms2-1 gene. This result will facilitate cloning the ptgms2-1 gene. The tightly linked markers for the ptgms2-1 gene locus will further provide a useful tool for marker-assisted selection of this gene in rice breeding programs. |
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