Nitrogen utilization characteristics and early storage root development in nitrogen-tolerant and nitrogen-susceptible sweet potato
文献类型： 外文期刊
作者： Duan, Wenxue 1 ; Zhang, Haiyan 1 ; Xie, Beitao 1 ; Wang, Baoqing 1 ; Hou, Fuyun 1 ; Li, Aixian 1 ; Dong, Shunxu 1 ; Qin, 1 ;
作者机构： 1.Shandong Acad Agr Sci, Crop Res Inst, 202 Gongyebei Rd, Jinan 250100, Shandong, Peoples R China
2.Minist Agr & Rural Affairs, Sci Observat & Expt Stn Tuber & Root Crops Huang, Jinan, Peoples R China
3.Shandong Acad Agr Sci, Jinan, Peoples R China
4.Shandong Normal Univ, Coll Life Sci, Jinan, Peoples R China
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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