Journal of Integrative Agriculture ›› 2014, Vol. 13 ›› Issue (4): 713-721.DOI: 10.1016/S1671-2927(00)9386

• 论文 • 上一篇    下一篇

Identification and Genetic Analysis of a Novel Rice Spotted-Leaf Mutant with Broad-Spectrum Resistance to Xanthomonas oryzae pv. oryzae

SHEN Hai-chao; SHI Yong-feng; FENG Bao-hua; WANG Hui-mei; XU Xia; HUANG Qi-na; L   

  1. State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, P.R.China
  • 收稿日期:2013-03-03 出版日期:2014-04-01 发布日期:2014-04-16
  • 通讯作者: Correspondence WU Jian-li, Tel/Fax: +86-571-63370326, E-mail: beishangd@163.com
  • 基金资助:

    This work was supported by the Sate Key Laboratory of Rice Biology, China (ZZKT200801) and the National High-Tech R&D Program of China (2011AA10A101 and 2012AA101102).

Identification and Genetic Analysis of a Novel Rice Spotted-Leaf Mutant with Broad-Spectrum Resistance to Xanthomonas oryzae pv. oryzae

SHEN Hai-chao; SHI Yong-feng; FENG Bao-hua; WANG Hui-mei; XU Xia; HUANG Qi-na; L   

  1. State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, P.R.China
  • Received:2013-03-03 Online:2014-04-01 Published:2014-04-16
  • Contact: Correspondence WU Jian-li, Tel/Fax: +86-571-63370326, E-mail: beishangd@163.com
  • Supported by:

    This work was supported by the Sate Key Laboratory of Rice Biology, China (ZZKT200801) and the National High-Tech R&D Program of China (2011AA10A101 and 2012AA101102).

摘要: A spotted-leaf mutant of rice HM143 was isolated from an EMS-induced IR64 mutant bank. Brown lesions randomly distributed on leaf blades were observed about 3 wk after sowing. The symptom lasted for the whole plant growth duration. Histochemical analysis indicated that cell death occurred in and around the site of necrotic lesions accompanied with accumulation of hydrogen hyperoxide. Agronomic traits were largely similar to the wild type IR64 except seed setting rate and 1 000-grain weight which were significantly decreased in the mutant. Disease resistance of the mutant to multiple races of Xanthomonas oryzae pv. oryzae was significantly enhanced. Genetic analysis showed that the mutation was controlled by a single recessive gene, tentatively termed splHM143. In addition, using molecular markers and 1 023 mutant type individuals from an F2 segregating population derived from the cross HM143/R9308, the spotted-leaf gene was finally delimited to an interval of 149 kb between markers XX25 and ID40 on the long arm of chromosome 4. splHM143 is likely a novel rice spotted-leaf gene since no other similar genes have been identified near the chromosomal region.

关键词: rice , spotted-leaf mutant , hypersensitive response-like , bacterial blight resistance , molecular marker

Abstract: A spotted-leaf mutant of rice HM143 was isolated from an EMS-induced IR64 mutant bank. Brown lesions randomly distributed on leaf blades were observed about 3 wk after sowing. The symptom lasted for the whole plant growth duration. Histochemical analysis indicated that cell death occurred in and around the site of necrotic lesions accompanied with accumulation of hydrogen hyperoxide. Agronomic traits were largely similar to the wild type IR64 except seed setting rate and 1 000-grain weight which were significantly decreased in the mutant. Disease resistance of the mutant to multiple races of Xanthomonas oryzae pv. oryzae was significantly enhanced. Genetic analysis showed that the mutation was controlled by a single recessive gene, tentatively termed splHM143. In addition, using molecular markers and 1 023 mutant type individuals from an F2 segregating population derived from the cross HM143/R9308, the spotted-leaf gene was finally delimited to an interval of 149 kb between markers XX25 and ID40 on the long arm of chromosome 4. splHM143 is likely a novel rice spotted-leaf gene since no other similar genes have been identified near the chromosomal region.

Key words: rice , spotted-leaf mutant , hypersensitive response-like , bacterial blight resistance , molecular marker