ACTA AGRICULTURAE BOREALI-SINICA ›› 2021, Vol. 36 ›› Issue (3): 83-89. doi: 10.7668/hbnxb.20191813

Special Issue: Rice

• Crop Genetics & Breeding·Germplasm Resources·Biotechnology • Previous Articles     Next Articles

Mapping QTLs Tolerant to Cold Stress in Rice Root by Chromosome Segment Substitution System

ZHANG Xiangyu1, YU Meixia1, TAN Jingai1, WANG Peng1, LI Caijing1, WU Guangliang1, CHENG Qin1, WANG Yanning1, JIANG Ningfei1, HUANG Shiying1, HE Haohua1,2,3, BIAN Jianmin1,2,3   

  1. 1. Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Nanchang 330045, China;
    2. Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding Jiangxi Province, Nanchang 330045, China;
    3. Jiangxi Rice High Level Engineering Research Center, Nanchang 330045, Chin
  • Received:2021-03-21 Published:2021-06-28

Abstract: To analyze the genetic mechanism of rice root number under low temperature and detect the cold stress related QTL, a chromosome segment substitution line (CSSLs) population of japonica variety Nipponbare in the background of indica cultivar 9311 used as the materials. The CSSL lines were treated under 15℃ for 10 days and then restore 7 days at 25℃ temperature, the root number was measured and QTL for root number was detected. The result display Nipponbare average root number was 4.50;9311 average root number was 7.20.The two kind of rice variety had very difference obvious. CSSL lines average root number was 4.84 and exist transgressive segregation.A total of two major QTLs, qCSRN1.1 and qCSRN3, were detected for root number. The two QTLs were located 31.75-33.15 Mb on chromosome 1 and 32.2-32.7 Mb on chromsome 3, respectively.The LOD values of these QTLs were 4.91 and 2.86 respectively, and the phenotypic variation explained by these QTL were 16.27% and 9.06%, respectively. The positive allele of qCSRN1.1 was from Nipponbare while positive allele of qCSRN3 was from the 9311.Candidate gene analysis showed that there were 138 candidate genes in qCSRN1.1;68 genes were related to protein synthesis;42 genes were related to enzymatic synthesis;3 genes was transcription factor. qCSRN3 had 88 candidate genes;62 genes were related to protein synthesis;9 genes were related to enzymatic synthsis;3 genes was transcription factor.Furthermore, two QTLs epistatic QTLs were detected on chromosomes 1 and 9, their epistatic effected were-0.34 and-0.43;LOD values of these QTLs were 5.60 and 5.75.The results showed that in low temperature stress, the development of rice root number was quantitative trait and affected by QTL interaction. The localization of these root number QTLs laids a foundation for the cloning of root number genes and the analyzed of root number genetic mechanism under low temperature stress in future.

Key words: Rice, QTL, Root number, Cold stress, Chromosome

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Cite this article

ZHANG Xiangyu, YU Meixia, TAN Jingai, WANG Peng, LI Caijing, WU Guangliang, CHENG Qin, WANG Yanning, JIANG Ningfei, HUANG Shiying, HE Haohua, BIAN Jianmin. Mapping QTLs Tolerant to Cold Stress in Rice Root by Chromosome Segment Substitution System[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(3): 83-89. doi: 10.7668/hbnxb.20191813.

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