Effects of elevated CO2 and nitrogen supply on leaf gas exchange, plant water relations and nutrient uptake of tomato plants exposed to progressive soil drying
Effects of elevated CO2 and nitrogen supply on leaf gas exchange, plant water relations and nutrient uptake of tomato plants exposed to progressive soil drying
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DOI：
10.1016/j.scienta.2021.110643
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发表时间：
2022-01
影响因子：
4.3
通讯作者：
Xin Yang;Peng Zhang;Zhenhua Wei;Jie Liu;Xiaotao Hu;Fulai Liu
中科院分区：
文献类型：
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作者：
Xin Yang;Peng Zhang;Zhenhua Wei;Jie Liu;Xiaotao Hu;Fulai Liu
研究了土壤CO2浓度升高（e[CO2]，800 ppm）条件下，氮素供应对番茄叶片气体交换、水分关系和养分吸收的影响。两种内源脱落酸（阿坝）水平不同的番茄基因型，即Ailsa克雷格和其ABA缺陷突变体（flacca）在温室细胞中的盆中生长，具有环境CO2（a[CO2]，400 ppm）或[CO2]。两个N级，即，使用N1，0.5 g pot-1和N2，1.0 g pot-1，并且在移栽前将N肥料（NH 4 NO3）与灌溉水一起施用。结果表明，[CO2]和N2提高了番茄的光合作用和水分利用效率（WUE）。N2通过提高土壤干燥过程中蒸腾速率的下降来改善植物的水分关系。[CO2]胁迫下，植株氮素吸收量和木质部汁液中主要离子浓度降低，这种负效应可通过增加供氮量来补偿。野生型（WT）的叶片（[阿坝]leaf）和木质部汁液（[阿坝]xylem）中阿坝含量随土壤可透性水含量的降低而增加，而赤藓型（Flaccathis）仅在[阿坝]leaf中观察到。与野生型相比，flacca具有较低的木质部汁液离子浓度和WUE。总的来说，番茄植株对土壤逐步干燥条件下的CO2和氮素供应的响应具有基因型依赖性，内源阿坝水平在调节这种响应中起重要作用。
The effects of nitrogen (N) supply on the response of leaf gas exchange, leaf water relations and plant nutrient uptake of tomato plants exposed to progressive soil drying under elevated CO2(e[CO2], 800 ppm) were investigated. Two tomato genotypes differing in their endogenous abscisic acid (ABA) level, i.e. Ailsa Craig and its ABA-deficient mutant (flacca) were grown in pots in greenhouse cells with either ambient CO2(a[CO2], 400 ppm) ore[CO2]. Two N levels, i.e., N1, 0.5 g pot−1and N2, 1.0 g pot−1were used and the N fertilizer (NH4NO3) was applied with the irrigation water before transplanting. The results showed thate[CO2] and N2 increased photosynthesis and water use efficiency (WUE) of tomato plants. N2 improved plant water relations by sensitizing the decline of transpiration rate during soil drying. The plant N acquisition and major ionic concentrations in xylem sap were lowered undere[CO2], such negative effect was compensated by increasing N supply. For WT, the ABA concentrations in leaf ([ABA]leaf) and xylem sap ([ABA]xylem) were increased with the decrease of the fraction of transpirable soil water, whereas, forflaccathis was only observed in [ABA]leaf. Compared to WT,flaccahad lower xylem sap ionic concentrations and WUE. Collectively, the responses of tomato plants toe[CO2] and N supply under progressive soil drying were genotypic-dependent, and endogenous ABA level could play an important role in modulating the responses.