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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (11): 1-9.doi: 10.11924/j.issn.1000-6850.casb2022-0293

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Characteristics and Genotype Analysis of High-quality Indica Rice Photo-Thermo-Sensitive Genic Male Sterile Line ‘7-163S’

ZHANG Caijuan1,2(), ZHOU Kunneng1, XIA Jiafa1, WANG Yuanlei1, YUN Peng1, MA Tingchen1, WU Dexiang2, LI Zefu1()   

  1. 1 Rice Research Institute/Key Laboratory of Rice Genetics and Breeding of Anhui Province, Anhui Academy of Agricultural Sciences, Hefei 230031
    2 College of Agronomy, Anhui Agricultural University, Hefei 230036
  • Received:2022-04-14 Revised:2022-08-27 Online:2023-04-15 Published:2023-04-10

Abstract:

In order to develop a suitable breeding strategy, the characteristics and genotypes of the indica rice photo-thermo-sensitive genic male sterile (PTGMS) line ‘7-163S’ were analyzed. ‘7-163S’ and its combinations or varieties were used to investigate the key agronomic characteristics. The genotypes of ‘7-163S’ were also determined using genome sequencing and the RiceNavi database. The results show that ‘7-163S’ has excellent agronomic characteristics, good fecundity, low beginning temperature of fertility alteration, and medium resistance to rice blast and bacterial blight. Four hybrid combinations or varieties were bred, showing moderate growth periods, good quality and high yield. Genotype analysis reveals that ‘7-163S’ contains resistance alleles to rice blast, bacterial blight and brown planthopper, as well as excellent alleles of low chalkiness, high nitrogen utilization efficiency and cold tolerance. However, the broad-spectrum blast resistance genes Pi2, Pi9 and Pigm, broad-spectrum bacterial blight resistance gene Xa23, fragrance gene fgr, and cadmium low accumulation genes OsCd1 and OsNRAMP5 are absent in ‘7-163S’. Combining genotypes with phenotypes can provide theoretical support for gene aggregation to enhance ‘7-163S’ resistance and breeding of new varieties.

Key words: rice, indica photo-thermo-sensitive genic male sterile (PTGMS) line, ‘7-163S’, characteristics, genotype analysis