Chinese Journal OF Rice Science >
Identification and Gene Mapping of a white-stripe leaf after transplanting at low temperature Mutant in Rice
Received date: 2018-03-13
Revised date: 2018-05-29
Online published: 2019-01-10
【Objective】 Isolation and characterization of leaf-color mutation related genes lays a firm theoretical foundation for dissecting the molecular mechanism underlying chloroplast development, chlorophyll biosynthesis, and photosynthesis in rice. 【Method】A spontaneous leaf-color mutant, termed as white stripe leaf after transplanting at low-temperature (wltt), was obtained from the progeny of japonica cultivar Zhennuo 19. The main agronomic traits of the wild type and wltt were determined at maturity. The pigment contents and ultrastructure of chloroplast of newly emerged leaves were analyzed at the seedling stage, fifteen days after transplanting, at the tillering stage under direct seeding. Genetic analysis was carried out by reciprocal cross of the wild type and wltt. An F2 population derived from the cross wltt×9311 was used for gene mapping. Quantitative RT-PCR was carried out to analyze the relative expression of genes associated with chloroplast development and chlorophyll biogenesis in the wild type and the wltt mutant. 【Result】The white-striped leaves in the wltt mutant only emerged at 15 days after transplanting at low temperature such as 20℃. No white-striped leaf was observed under direct seeding treatment. However, leaves of the mutant developed normally at the late tillering stage. Simulation experiments showed that the mutant phenotype was caused by root injury at low temperature. Compared with the wild type, the pigment contents in white-stripe leaves of the wltt mutant were significantly decreased, accompanying by reduced photosynthetic rate. Simultaneously, most of the mesophyll cells had no chloroplasts. The expression levels of genes associated with chloroplast development, chlorophyll biosynthesis, and photosynthetic system were all down-regulated in the mutant. At maturity, the mutant was featured with reduced plant height, panicle length, flag leaf length and number of spikelets per panicle relative to its wild type. Genetic analysis revealed that the mutant phenotype was controlled by a single recessive nuclear gene. Moreover, the WLTT gene was mapped within an 853 kb region near the centromere on chromosome 2, between InDel markers L22 and L26, in which no gene related to leaf color was reported. 【Conclusion】WLTT is a key gene regulating leaf color after transplanting at low temperature, which plays an important role in chloroplast development.
Tianzi LIN, Liting SUN, Hongbin GONG, Yihua WANG, Linglong LIU, Zhigang ZHAO, Ling JIANG, Jianmin WAN . Identification and Gene Mapping of a white-stripe leaf after transplanting at low temperature Mutant in Rice[J]. Chinese Journal OF Rice Science, 2019 , 33(1) : 1 -11 . DOI: 10.16819/j.1001-7216.2018.8026
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