Department of Agricultural Sciences, Universidad Católica del Maule, Curicó P.O. Box 684, Chile.
Plant Breeding and Phenomic Center, Faculty of Agricultural Sciences, Universidad de Talca, Talca P.O. Box 747, Chile.
Sensors (Basel). 2019 Jun 13;19(12):2676. doi: 10.3390/s19122676.
Canopy temperature (Tc) by thermal imaging is a useful tool to study plant water status and estimate other crop traits. This work seeks to estimate grain yield (GY) and carbon discrimination (ΔC) from stress degree day (SDD = Tc - air temperature, Ta), considering the effect of a number of environmental variables such as the averages of the maximum vapor pressure deficit (VPDmax) and the ambient temperature (Tmax), and the soil water content (SWC). For this, a set of 384 and a subset of 16 genotypes of spring bread wheat were evaluated in two Mediterranean-climate sites under water stress (WS) and full irrigation (FI) conditions, in 2011 and 2012, and 2014 and 2015, respectively. The relationship between the GY of the 384 wheat genotypes and SDD was negative and highly significant in 2011 (r = 0.52 to 0.68), but not significant in 2012 (r = 0.03 to 0.12). Under WS, the average GY, ΔC, and SDD of wheat genotypes growing in ten environments were more associated with changes in VPDmax and Tmax than with the SWC. Therefore, the amount of water available to the plant is not enough information to assume that a particular genotype is experiencing a stress condition.
冠层温度（Tc）通过热成像技术是研究植物水分状况和估计其他作物特性的有用工具。本研究旨在通过胁迫度日（SDD=Tc-空气温度 Ta）来估算籽粒产量（GY）和碳差异（ΔC），同时考虑了许多环境变量的影响，如最大蒸气压亏缺（VPDmax）和环境温度（Tmax）的平均值，以及土壤含水量（SWC）。为此，在 2011 年和 2012 年以及 2014 年和 2015 年，在两个地中海气候条件下，分别对 384 个和 16 个春小麦基因型进行了评估，这些基因型处于水分胁迫（WS）和充分灌溉（FI）条件下。在 2011 年，384 个小麦基因型的 GY 与 SDD 之间呈负相关且高度显著（r=0.52 至 0.68），但在 2012 年不显著（r=0.03 至 0.12）。在 WS 条件下，在十个环境中生长的小麦基因型的平均 GY、ΔC 和 SDD 与 VPDmax 和 Tmax 的变化更相关，而与 SWC 的相关性较低。因此，植物可获得的水量不足以假设特定基因型正在经历胁迫条件。
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