Chinese Journal OF Rice Science >
Identification and Gene Mapping of a Rolled Leaf Mutant rl(t) in Rice
Online published: 2017-03-10
【Objective】Rice leaf is an important factor for ideal plant architecture in rice, and moderate rolling of the leaves can improve light acceptance and photosynthetic rate. Genetic analysis and primary mapping of the target genes are useful in map-based cloning and function analysis.【Method】A stable inherited mutant, derived from an indica maintainer line Yixiang 1B by EMS treatment, exhibited significantly inward-rolling, more erect and green leaves. At the maturity stage, 10 plants of rl(t) and its wild type(WT) were randomly selected to measure the main agronomic traits including leaf rolling index and leaf erect index. At the tillering stage, the same part of leaf of rl16(t) and WT was taken and fixed by FAA for paraffin sectioning. The chlorophyll content in rl16(t) and WT was tested at the same stage. At the heading stage, the photosynthetic rate, intercellular carbon dioxide concentration, stamatal conductance,and transpiration rate of flag leaves in rl15(t) and WT were measured by using the portable gas exchange system Li-6400.【Result】Compared to wide type, rl(t) displayed reduced plant height, shortened panicle length as well as other agronomic traits. Leaf photosynthetic pigment contents were significantly higher than those of the wild type. However, no difference is observed in photosynthetic efficiency. Cytological analysis showed that the rolled leaf phenotype was possibly caused by the reduced size of bulliform cells. Genetic analysis indicated that rolled leaf phenotype in rl(t) was controlled by a single recessive nuclear gene. In an F2 population derived from a cross between the mutant and Nipponbare, RL(t) was mapped to a 610 kb region between Ind3 and Ind4 on the long arm of chromosome 7. In target region, there are 102 genes altogether.【Conclusion】The rolled leaf of rl(t) was due to increased area of bulliform cells in adaxial layer and no gene related to roll-leaf was reported in the target region. So, RL (t) gene would be a putative novel rolled leaf gene.
Key words： rice; rolled leaf; gene mapping
Baolin HAN, Yu TAO, Hongkai ZHANG, Chaojian GU, Yongxiang LIAO, Yongbin PENG, Hongyu ZHANG, Peizhou XU, Xiaoqiong CHEN, Xianjun WU . Identification and Gene Mapping of a Rolled Leaf Mutant rl(t) in Rice[J]. Chinese Journal OF Rice Science, 2017 , 31(2) : 149 -156 . DOI: 10.16819/j.1001-7216.2017.6137
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