The root nitrogen uptake response to partial nitrogen stress is related to previous nutritional status

文献类型： 外文期刊

第一作者： Niu, Xiaoli

作者： Niu, Xiaoli;Duan, Aiwang;Zhang, Jiyang;Niu, Xiaoli;Hu, Tiantian;Zhang, Fucang;Niu, Xiaoli

作者机构：

关键词： Root N inflow rate; N use efficiency; N stress severity; Previous nutritional status; Partial root system; Maize

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

ISSN： 0167-6903

年卷期： 2019 年 87 卷 1 期

页码：

收录情况： SCI

摘要： We investigated the dynamics and factors influencing the N uptake capacity in two sub-root systems of maize seedlings under partial N stress. Maize seedlings were grown in split-root containers containing nutrient solutions. Two N application conditions prior to partial N stress (full-strength N (4.0 mM): CP; N stress: SP) were considered. Thus, two experiments were conducted: (A) four treatments: CPNc, CPN2, CPN1 and CPN0, in which half of the root system was exposed to 4.0 mM, 2 mM, 1 mM and 0 mM N (CPNc-c, CPN2-2, CPN1-1 and CPN0-0), respectively, and the other half received full-strength N (CPNc-c, CPN2-c, CPN1-c and CPN0-c); (B) four treatments: SPNc, SPN2, SPN1 and SPN0, in which both sub-root systems received 4.0 mM, 2 mM, 1 mM and 0 mM N for 6 days, respectively, after which half of the root system was maintained at original N level (SPNc-c, SPN2-2, SPN1-1 and SPN0-0) and the other half received full-strength N (SPNc-c, SPN2-c, SPN1-c and SPN0-c). At 0.25 days after treatment (DAT), CPN2-c and CPN1-c enhanced N inflow rates (I-root), whereas CPN0-c decreased it by 27.3% compared with CPNc-c, I-root in CPN2-c, CPN1-c and CPN0-c was uniformly enhanced at 1 DAT, but were only enhanced in CPN0-c at 5 DAT compared with CPNc-c. In contrast, SPN1-c had a significantly increased I-root by 10.52% compared with SPNc-c, although other treatments showed a negative effect on I-root at 0.25 DAT. At 1 and 5 DAT, I-root in SPN2-c, SPN2-2, SPN1-c, SPN1-1 and SPN0-c were significantly lower than that in SPNc-c. Furthermore, CP significantly enhanced I-root in non-stressed sub-roots compared with SP. Additionally, CPN2 improved shoot dry mass and N use efficiency even under SPN2. Thus, N uptake capacity in each sub-root zone varied not only depending on the severity and duration of the N stress, but was also related to the N status prior to partial N stress. Moreover, the occurrence and disappearance of the root compensatory effect were delayed with increasing N stress severity. A higher compensatory effect developed following CP, even under CPN0.

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