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Fine mapping and photosynthetic characteristics of the lower chlorophyll b 1 mutant in rice ( Oryza sativa L.)
Author(s) -
Liu Jin,
Wang Jiayu,
Yao Xiaoyu,
Dong Xiaoyan,
Chen Wenfu
Publication year - 2015
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12320
Subject(s) - biology , oryza sativa , chlorophyll , chloroplast , photosynthesis , mutant , chlorophyll fluorescence , chlorophyll b , population , botany , chlorophyll a , gene , genetics , demography , sociology
Chlorophylls absorb and transfer light energy to the photosynthetic system. Consequently, chlorophyll content is strongly related to crop biomass and yield. We isolated a rice spontaneous mutant, lower chlorophyll b 1 ( lcb1 ), from a recombinant inbred line population. Under normal growth conditions, lcb1 plants produced yellow leaves with decreased total chlorophyll and chlorophyll b contents, but normal chlorophyll a content. Photosynthetic and fluorescence parameters differed between wild‐type and lcb1 plants. Compared with wild type, lcb1 had a higher electron transfer rate, a lower photochemical quenching coefficient and significantly reduced grain number, biomass and yield. A recessive nuclear gene controlled the mutant trait. Through map‐based cloning, we located the LCB 1 gene in a 117.4‐kb region on the short arm of chromosome 3, close to the centromere, in a region containing 15 predicted candidate genes. None of these genes was directly related to chlorophylls or the chloroplast; therefore, lcb1 may be a mutation of a novel gene. These results will be useful for further research on the molecular mechanisms controlling biogenesis and chloroplast biochemical processes.

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