Jiangsu Key Laboratory of Crop Genetics and Physiology, Yangzhou University, 225009 Yangzhou, Jiangsu, China.
Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, 225009 Yangzhou, Jiangsu, China.
Front Biosci (Landmark Ed). 2024 Feb 5;29(2):57. doi: 10.31083/j.fbl2902057.
L. Schott is a main traditional root crop in China, serving as an important vegetable and staple food. Drought stress plays vital role on the growth and development of taro corm.
Two different varieties of taro in Jiangsu were selected: Xiangsha taro and Longxiang taro. The accumulation characteristics, morphological structure, and physicochemical properties of taro corm starch were studied by microscopic observation, particle size analysis, and X-ray diffractometer (XRD) analysis. Transcriptome analyses were used to identify the related genes of taro corm under drought stress.
During the growth of taro, the number of amyloplasts showed an obvious increasing trend and shifted from being dispersed throughout the cells to being gathered on one side of the cells, and morphological observations showed that smaller granular distribution gradually changed to a larger lumpy distribution. The particle size of Longxiang taro is smaller than that of Xiangsha taro. Under drought stress conditions, the occurrence of starch grains and corm size were inhibited in Xiangsha taro. Transcriptome sequencing of drought-stressed taro corms showed that the enzymes related to starch synthesis were differentially expressed. Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis of drought-stressed taro corms showed that drought affected hormone signal transduction, material metabolism, drought stress tolerance, plant growth and development, and stress resistance, which triggered the plant drought adaptive response.
Drought stress inhibits starch accumulation in taro.
蕌头是中国的一种主要传统根茎作物，既是重要的蔬菜，也是主要的粮食作物。干旱胁迫对芋艿球茎的生长和发育起着至关重要的作用。
选择江苏的两个不同品种的芋艿：香沙芋和龙香芋。通过微观观察、粒径分析和 X 射线衍射（XRD）分析研究了芋艿球茎淀粉的积累特性、形态结构和理化性质。利用转录组分析鉴定了干旱胁迫下芋艿球茎的相关基因。
在芋艿的生长过程中，淀粉体的数量呈现明显的增加趋势，并从分散在细胞中的状态转移到聚集在细胞一侧的状态，形态观察表明较小的颗粒分布逐渐变为较大的块状分布。龙香芋的粒径小于香沙芋。在干旱胁迫条件下，香沙芋的淀粉粒发生和球茎大小受到抑制。干旱胁迫芋艿球茎的转录组测序表明，与淀粉合成相关的酶表现出差异表达。干旱胁迫芋艿球茎的京都基因与基因组百科全书（KEGG）富集分析表明，干旱影响激素信号转导、物质代谢、耐旱性、植物生长发育和应激抗性，从而引发植物的干旱适应反应。
干旱胁迫抑制芋艿淀粉的积累。
