Nitrogen utilization characteristics and early storage root development in nitrogen-tolerant and nitrogen-susceptible sweet potato

文献类型： 外文期刊

第一作者： Duan, Wenxue

作者： Duan, Wenxue;Zhang, Haiyan;Xie, Beitao;Wang, Baoqing;Hou, Fuyun;Li, Aixian;Dong, Shunxu;Qin, Zhen;Wang, Qingmei;Zhang, Liming;Duan, Wenxue;Zhang, Haiyan;Xie, Beitao;Wang, Baoqing;Hou, Fuyun;Li, Aixian;Dong, Shunxu;Qin, Zhen;Wang, Qingmei;Zhang, Liming;Zhang, Liming;Zhang, Liming

作者机构：

期刊名称：PHYSIOLOGIA PLANTARUM （ 影响因子：4.5； 五年影响因子：4.576 ）

ISSN： 0031-9317

年卷期： 2021 年 173 卷 3 期

页码：

收录情况： SCI

摘要： In recent years, sweet potato has been cultivated not only in marginal lands but also in fertile plains in northern China. The fertile nitrogen (N)-rich soil may inhibit storage root formation. Cultivars with different N tolerances and split application of reduced N rates should be considered. To investigate the effects of N on the N utilization, root differentiation, and storage root formation of cultivars with different N tolerances, the cultivars Jishu26 (J26) and Xushu32 (X32) were treated with three N levels supplied by urea: 0 (N0), 200 (N1) and 400 mg kg(-1) (N2). With increasing N rates, "X32" absorbed less N in plants and distributed more N to developing storage roots than "J26." The storage root development of "J26" was sensitive to both N1 and N2, while that of "X32" was only sensitive to N2. High N nutrition upregulated the expression of certain genes during storage root formation, such as PAL, CHI, F3H, C4H, 4CL, CAD, alpha-amylase, and beta-amylase. Under N1 and N2, "X32" led to an increased sugar supply in sink organs and downregulated the expression of genes related to lignin and flavonoid synthesis, which promoted the C flux toward starch metabolism, thus reducing lignification and promoting starch accumulation during storage root formation. These results provide evidence for the effects of N on the C distribution in different metabolic pathways by regulating the expression of related key genes. N-tolerant cultivars are suitable in fertile plain areas because of the earlier formation of storage roots under high N conditions.

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