Crop water stress index characterizes maize productivity under water and salt stress by using growth stage-specific non-water stress baselines

IF 5.6 1区 农林科学 Q1 AGRONOMY
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Abstract

Context

The use of non-destructive, continuous, and rapid canopy temperature (Tc) indices for crop stress diagnosis is of significant importance for improving crop water productivity (WP). However, the comprehensive applicability of the crop water stress index (CWSI), grounded in Tc, in diagnosing both single and combined water and salt stress, as well as characterizing physiological and growth traits, remains inadequately explored.

Objective

We aim to investigate the ability of CWSI to diagnose single and combined water and salt stress and to test whether a non-water stress baseline (NWSB) with or without growth stage and genotype differences influences CWSI to characterise maize leaf physiological and growth traits.

Methods

Here, we measured the Tc using infrared radiation thermometers of two maize genotypes (XY335 and ZD958) under both single and combined water and salt stress over two growing seasons, compared the differences of NWSB in three growth stages, and established CWSI. Our analysis involved scrutinizing the differences in characterizing crop physiology and growth traits between CWSI calculated using NWSB with and without growth stage differentiations.

Results

Our findings indicated that Tc is modulated by an interplay of soil water content, VPD, and soil salinity. The NWSB exhibited variations with both growth stage (pslope < 0.001) and genotype (pslope or pintercept < 0.01). The CWSI can diagnose single and combined water and salt stress suffered by maize. Under no stress, and single and combined water and salt stress, CWSI was significantly correlated with stomatal conductance (R2 ≥ 0.31, p < 0.1) and net photosynthetic rate (R2 ≥ 0.38, p < 0.1), rather than with hydraulic traits. The mean CWSI across the entire growth period closely correlated with leaf area index (LAI), canopy photosynthetically active radiation interception, biomass, yield, and evapotranspiration across varying treatments (R2 ≥ 0.54, p < 0.1). Contrary to CWSI derived from NWSB without growth stage variations, utilizing CWSI with growth stage distinctions better characterized physiological traits, while the former was more suitable for delineating yield and WP.

Implications

This research underscores the efficacy of CWSI for stress diagnosis and the evaluation of gas exchange and productivity in maize under both single and combined soil water-salt stress. This investigation significantly propels forward the implementation of crop-centric irrigation strategies aimed at optimizing water utilization efficiency.

作物水分胁迫指数利用特定生长阶段的非水分胁迫基线描述玉米在水分和盐分胁迫下的生产力特征
背景使用非破坏性、连续、快速的冠层温度(Tc)指数诊断作物胁迫对提高作物水分生产率(WP)具有重要意义。目的我们旨在研究作物水分胁迫指数(CWSI)诊断单一和综合水分胁迫和盐分胁迫的能力,并测试有无生长阶段和基因型差异的非水分胁迫基线(NWSB)是否会影响作物水分胁迫指数(CWSI)对玉米叶片生理和生长性状的描述。方法在两个生长季中,我们使用红外辐射温度计测量了两种玉米基因型(XY335 和 ZD958)在单一和水盐联合胁迫下的 Tc,比较了三个生长阶段中 NWSB 的差异,并确定了 CWSI。结果我们的研究结果表明,Tc 受土壤含水量、VPD 和土壤含盐量的相互影响。NWSB 随生长阶段(pslope < 0.001)和基因型(pslope 或 pintercept < 0.01)的变化而变化。CWSI 可以诊断玉米遭受的单一胁迫和水盐联合胁迫。在无胁迫、单一胁迫和水盐联合胁迫下,CWSI与气孔导度(R2≥0.31,p <0.1)和净光合速率(R2≥0.38,p <0.1)显著相关,而与水分性状无关。整个生长期的平均 CWSI 与不同处理的叶面积指数(LAI)、冠层光合有效辐射截获、生物量、产量和蒸散量密切相关(R2 ≥ 0.54,p < 0.1)。这项研究强调了 CWSI 在单一土壤水分-盐分胁迫和综合土壤水分-盐分胁迫下对玉米进行胁迫诊断以及气体交换和生产力评估的有效性。这项研究极大地推动了以作物为中心的灌溉策略的实施,旨在优化水的利用效率。
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来源期刊
Field Crops Research
Field Crops Research 农林科学-农艺学
CiteScore
9.60
自引率
12.10%
发文量
307
审稿时长
46 days
期刊介绍: Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.
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