Involvement of nitrogen in storage root growth and related gene expression in sweet potato (Ipomoea batatas)

文献类型： 外文期刊

第一作者： Yao, Z.

作者： Yao, Z.;Wang, Z.;Fang, B.;Chen, J.;Zhang, X.;Luo, Z.;Huang, L.;Zou, H.;Yang, Y.

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关键词： Expression patterns; nitrogen; storage root; sweet potato

期刊名称：PLANT BIOLOGY （ 影响因子：3.081； 五年影响因子：2.972 ）

ISSN： 1435-8603

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收录情况： SCI

摘要： Nitrogen (N) could affect storage root growth and development of sweet potato. To manage external N concentration fluctuations, plants have developed a wide range of strategies, such as growth changes and gene expression. Five sweet potato cultivars were used to analyse the functions of N in regulating storage root growth. Growth responses and physiological indicators were measured to determine the physiological changes regulated by different N concentrations. Expression profiles of related genes were analysed via microarray hybridization data and qRT-PCR analysis to reveal the molecular mechanisms of storage root growth regulated by different N concentrations. The growth responses and physiological indicators of the five cultivars were changed by N concentration. The root fresh weight of two of the sweet potato cultivars, SS19 and GS87, was higher under low N concentrations compared with the other cultivars. SS19 and GS87 were found to be having greater tolerance to low N concentration. The expression of N metabolism and storage root growth related genes was regulated by N concentration in sweet potato. These results reveal that N significantly regulated storage root growth. SS19 and GS87 were more tolerant to low N concentration and produced greater storage root yield (at 30 days). Furthermore, several N response genes were involved in both N metabolism and storage root growth.

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