RICE SCIENCE ›› 2010, Vol. 17 ›› Issue (4): 276-281 .DOI: 10.1016/S1672-6308(09)60027-5

• Research Paper • Previous Articles     Next Articles

Genetic Analysis and Mapping of a Thermo-sensitive White Stripe-Leaf Mutant at Seedling Stage in Rice (Oryza sativa)

LI Chao1; LIN Dong-zhi1; DONG Yan-jun1; YE Sheng-hai2; ZHANG Xiao-ming2   

  1. 1Laboratory of Plant Genetics and Functional Genes, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, China; 2Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2010-06-10 Online:2010-12-28 Published:2010-12-28
  • Contact: LIN Dong-zhi; DONG Yan-jun
  • Supported by:
    the National Natural Science Foundation of China (Grant No. 30971552), Shanghai Municipal Education Commission of China (Grant No. 09YZ167), Shanghai Municipal Science and Technology Commission of China (Grant Nos. 08PJ14085, 9391912300 and 09DJ1400505), and the Leading Academic Discipline Project of Shanghai Municipal Education Commission, China (Grant No. J50401).

Abstract: A thermo-sensitive white stripe-leaf mutant (tws) was selected from the M2 progeny of a japonica variety, Jiahua 1, treated by 60Co γ-radiation. In comparison with the wild type parent, the mutant displayed a phenotype of white stripe on the 3rd and 4th leaves, but began to turn normal green on the 5th leaf when grown at low temperatures (20°C and 24°C). Furthermore, the content of total chlorophyll showed an obvious decrease in the leaves with white stripe. These results suggest that the expression of the mutant trait was thermo-sensitive and correlated with the leaf age of seedlings. The genetic analysis indicated that the mutant trait was controlled by a single recessive nuclear gene, designated as tws. In addition, by using SSR markers and an F2 segregating population derived from the cross between the tws mutant and 9311, tws was mapped between the markers MM3907 and MM3928 with a physical distance of 86 kb on rice chromosome 4

Key words: rice, thermo-sensitivity, white stripe-leaf mutant, gene mapping, genetics