数字农科院2.0

Heterogeneous distribution of salinity and nitrogen in the root-zone influence nitrogen harvest index and natural 15N abundance of tomato

文献类型： 外文期刊

作者： Jinjing Liu;Zhenchang Wang;Yuexiong Wang;Yaosheng Wang;Yousef Alhaj Hamoud;Cheng Hong;Hiba Shaghaleh;Rangjian Qiu;Jiaming You;Minghao Tian;Kexin Chen;Xiaoman Qiang;Sheng Chen

作者机构：

关键词： Nitrogen heterogeneity;Nitrogen utilization efficiency;Solanum lycopersicum L.;δ15N

期刊名称： Plant Science

ISSN： 0168-9452

年卷期： 2025 年 362 卷

页码：

收录情况： SCIE（2025版）

摘要： Plant growth in heterogeneous saline soils has been widely investigated. However, how plants adapting to simultaneous salinity and nitrogen (N) heterogeneity remains largely elusive. This study aimed to investigate the combined effects of heterogeneous distribution of salinity and N on ions concentration, N utilization efficiency (NUE), and 15N natural abundance (δ15N) in tomatoes, using a split‑root approach. The treatments comprised three salinity distribution patterns, viz. S1:5, (1 ‰/5 ‰ by mass of soil in low-salt side/high-salt side), S2:4 (2 ‰/4 ‰) and S3:3 (3 ‰/3 ‰). Additionally, three N supply patterns were implemented including N4:0 (270/0 mg kg−1 of low-salt side/high-salt side), N0:4 (0/270 mg kg−1) and N2:2 (135/135 mg kg−1). Compared to the S3:3, the non-uniform salinity (S1:5 and S2:4) combined with localized N supply in high-salt side (N0:4) treatments increased the proportion of high-salt side root length and water consumption by high-salt side roots, resulting in an elevated interface with soil Na+ and a decreased leaf K+/Na+ ratio. The root length arithmetic mean salinity (RLMS) correlated strongly with leaf Na+ concentration and K+/Na+ ratio, suggesting that RLMS may be a reliable salinity distribution indicator in the root zone. The reduced leaf K+/Na+ ratio and increased RLMS under N0:4 was associated with increased salinity stress, which significantly inhibited stomatal conductance (gs) and led to a decrease in stem δ15N, while simultaneously increasing the N harvest index (NHI) in tomatoes. Furthermore, localized N supply (N0:4 and N4:0) treatments significantly decrease the leaf N/Ca2+ ratio, indicating enhanced N reallocation from leaf to fruit. This increased N reallocation altered the δ15N patterns in both leaves and fruits, and might disrupt the typical relationship between δ15N and NHI across different plant organs. Consequently, our findings suggest that δ15N, particularly in stems, could serve as a valuable indicator of NHI in regions where tomato production is challenged by heterogeneous salinity and N distribution.

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