SH1-dependent maize seed development and starch synthesis via modulating carbohydrate flow and osmotic potential balance
文献类型： 外文期刊
作者： Zhang, Ke 1 ; Guo, Li 1 ; Cheng, Wen 2 ; Liu, Baiyu 1 ; Li, Wendi 1 ; Wang, Fei 3 ; Xu, Changzheng 4 ; Zhao, Xiangyu 5 ; Din 1 ;
作者机构： 1.Shandong Univ, Sch Life Sci, Minist Educ, Key Lab Plant Dev & Environm Adaptat Biol, Qingdao 266237, Peoples R China
2.Shandong Acad Agr Sci, Maize Inst, Jinan, Shandong, Peoples R China
3.Chinese Acad Sci, Shanghai Inst Biol Sci, Inst Plant Physiol & Ecol, Natl Key Lab Plant Mol Genet,CAS Ctr Excellence M, Shanghai 200032, Peoples R China
4.Southwest Univ, Sch Life Sci, Chongqing 400715, Peoples R China
5.Shandong Agr Univ, Coll Life Sci, State Key Lab Crop Biol, Tai An 271018, Shandong, Peoples R China
关键词： Glucose-1-phosphate; Seed development; SH1; Soluble sugars; Starch synthesis; Zea mays
期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）
ISSN： 1471-2229
年卷期： 2020 年 20 卷 1 期
页码：
收录情况： SCI
摘要： Background As the main form of photoassimilates transported from vegetative tissues to the reproductive organs, sucrose and its degradation products are crucial for cell fate determination and development of maize kernels. Despite the relevance of sucrose synthase SH1 (shrunken 1)-mediated release of hexoses for kernel development, the underlying physiological and molecular mechanisms are not yet well understood in maize (Zea mays). Results Here, we identified a new allelic mutant ofSH1generated by EMS mutagenesis, designated assh1*. The mutation ofSH1caused more than 90% loss of sucrose synthase activity insh1*endosperm, which resulted in a significant reduction in starch contents while a dramatic increase in soluble sugars. As a result, an extremely high osmolality in endosperm cells ofsh1*was generated, which caused kernel swelling and affected the seed development. Quantitative measurement of phosphorylated sugars showed that Glc-1-P in endosperm ofsh1*(17 mu g g(- 1)FW) was only 5.2% of that of wild-type (326 mu g g(- 1)FW). As a direct source of starch synthesis, the decrease of Glc-1-P may cause a significant reduction in carbohydrates that flow to starch synthesis, ultimately contributing to the defects in starch granule development and reduction of starch content. Conclusions Our results demonstrated that SH1-mediated sucrose degradation is critical for maize kernel development and starch synthesis by regulating the flow of carbohydrates and maintaining the balance of osmotic potential.
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