RICE SCIENCE ›› 2007, Vol. 14 ›› Issue (3): 172-180 .

• Research Paper • Previous Articles     Next Articles

Identification and Fine Mapping of a Gene Related to Pale Green Leaf Phenotype near the Centromere Region in Rice (Oryza sativa)

ZHU Li, LIU Wen-zhen, WU Chao, LUAN Wei-jiang, FU Ya-ping, HU Guo-cheng, SI Hua-min, SUN Zong-xiu   

  1. State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China
  • Received:2007-06-29 Online:2007-09-28 Published:2007-09-28
  • Contact: SUN Zong-xiu
  • Supported by:
    the National Basic Research Program of China (Grant Nos. G199901116-1 and 2005CB120801), and the National High-Tech Research and Development Program (Grant No. 2002AA2Z1001).

Abstract: A thermo-insensitive pale green leaf mutant (pgl2) was isolated from T-DNA inserted transgenic lines of rice (Oryza sativa L. subsp. japonica cv. Nipponbare). Genetic analysis indicated that the phenotype was caused by a recessive mutation in a single nuclear-encoded gene. To map the PGL2 gene, an F2 population was constructed by crossing the mutant with Longtefu (Oryza sativa L. subsp. indica). The PGL2 locus was roughly linked to SSR marker RM331 on chromosome 8. To finely map the gene, 14 new InDel markers were developed around the marker, and PGL2 was further mapped to a 2.37 Mb centromeric region. Analysis on chlorophyll contents of leaves showed that there was no obvious difference between the mutant and the wild type in total chlorophyll (Chl) content, while the ratio of Chl a / Chl b in the mutant was only about 1, which was distinctly lower than that in the wild type, suggesting that the PGL2 gene was related to the conversion between Chl a and Chl b. Moreover, the method of primer design around the centromeric region was discussed, which would provide insight into fine mapping of the functional genes in plant centromeres.

Key words: centromere, gene, fine mapping, pale green leaf mutant, chlorophyll a, chlorophyll b, rice