MeNINV1: An Alkaline/Neutral Invertase Gene of Manihot esculenta, Enhanced Sucrose Catabolism and Promoted Plant Vegetative Growth in Transgenic Arabidopsis

文献类型： 外文期刊

第一作者： Wang, Ya-Jie

作者： Wang, Ya-Jie;Zhen, Xing-Hou;Zhou, Yang-Jiao;Hou, Jing-Yi;Wang, Xin;Hu, Xin-Wen;Geng, Meng-Ting;Wang, Ya-Jie;Wang, Yun-Lin;Li, Rui-Mei;Liu, Jiao;Yao, Yuan;Guo, Jian-Chun

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关键词： cassava; alkaline/neutral invertase; MeNINV1; Arabidopsis thaliana; sucrose metabolism; vegetative growth

期刊名称：PLANTS-BASEL （ 影响因子：4.658； 五年影响因子：4.827 ）

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年卷期： 2022 年 11 卷 7 期

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收录情况： SCI

摘要： Alkaline/neutral invertase (A/N-INV) is an invertase that irreversibly decomposes sucrose into fructose as well as glucose and plays a role in plant growth and development, starch synthesis, abiotic stress, and other plant-life activities. Cassava is an economically important starch crop in tropical regions. During the development of cassava tuber roots, A/N-INV activity is relatively high, which indicates that it may participate in sucrose metabolism and starch synthesis. In this study, MeNINV1 was confirmed to function as invertase to catalyze sucrose decomposition in yeast. The optimal enzymatic properties of MeNINV1 were a pH of 6.5, a reaction temperature of 40 degrees C, and sucrose as its specific catalytic substrate. VB6, Zn2+, and Pb2+ at low concentrations as well as EDTA, DTT, Tris, Mg2+, and fructose inhibited A/N-INV enzymic activity. In cassava, the MeNINV1 gene was mainly expressed in the fibrous roots and the tuber root phloem, and its expression decreased as the tuber root grew. MeNINV1 was confirmed to localize in chloroplasts. In Arabidopsis, MeNINV1-overexpressing Arabidopsis had higher A/N-INV activity, and the increased glucose, fructose, and starch content in the leaves promoted plant growth and delayed flowering time but did not change its resistance to abiotic stress. Our results provide new insights into the biological function of MeNINV1.

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