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Genetic variation in lbl1 contributes to depth of leaf blades lobes between cotton subspecies, Gossypium barbadense and Gossypium hirsutum

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Journal of Integrative Agriculture 2018年第11期17卷 2394-2404页

作者： HE Dao-fang ZHAO Xiang LIANG Cheng-zhen ZHU Tao Muhammad Ali Abid CAI Yong-ping HE Jin-ling ZHANG Rui School of Life Science Anhui Agricultural University Biotechnology Research Institute Chinese Academy of Agricultural Sciences

Leaf is a essential part of the plants for photosynthetic activities which mainly economize the resources for boll heath. Significant variations of leaf shapes across the Gossypium sp. considerably influence the infiltration of sunlight for photosynthesis. To understand the genetic variants and molecular processes underlying for cotton leaf shape, we used F2 population derived from upland cotton genotype P30A （shallow-lobed leaf） and sea-island cotton genotype ISR （deep-lobed leaf） to map leaf deep lobed phenotype controlling genes lbl1 and lbl2. Genetic analysis and localization results have unmasked the position and interaction between both loci of lbl1 and lbl2, and revealed the co-dominance impact of the genes in regulating depth of leaf blades lobes in cotton. lbl1 had been described as a main gene and member of transcription factor family leucine zipper （HD-ZIPI） from a class I homologous domain factor ***2G244000. The qRT-PCR results elaborated the continuous change in expression level of lbl1 at different growth stages and leaf parts of cotton. Higher expression level was observed in mature large leaves followed by medium and young leaves respectively. For further confirmation, plants were tested from hormonal induction treatments, which explained that lbl 1 expression was influenced by hormonal signaling. Moreover, the highest expression level was detected in brassinolides （BR） treatment as compared to other hormones, and this hormone plays an important role in the process of leaf blade lobed formation.

关键词： leaf blades lobes HD-ZIPI lbl1 cotton Gossypium barbadense Gossypium hirsutum

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