While improved crop water-deficit tolerance is considered of primary importance, many phenotyping efforts focusing on quantifying structural root traits make assumptions about architecture representing root function. Therefore, the aim of this study was to quantify whole plant water-use traits among disparate peanut (Arachis hypogaea L.) genotypes and determine their impact on water-deficit tolerance. Mini-rhizotrons were installed to evaluate genotypic root architecture and developmental changes to two irrigation regimes imposed during early development. Following the early-season irrigation regimes, above- and below-ground traits were studied across a range of soil water conditions through measures of: (a) leaf-level gas exchange and (b) soil water depletion quantified using a novel soil water probe inserted into mini-rhizotrons allowing for matched root architecture and soil water depletion measures. While differential water treatments influenced root system architecture development among the genotypes, soil water depletion locations were primarily determined by water availability in the soil profile, not simply by having greater root length at a given soil location. This contradicts the assumption that greater root presence is a consistent indicator of increased root activity. Phenotypic selection of root traits for improving the efficiency of crop water use should consider both structural and functional traits in relation to the intended production environments slated for future cultivar development.

中文翻译：

---

受水分利用性状和土壤水分可用性影响的花生亚种土壤水分消耗,受水分利用性状和土壤水分可用性影响的花生亚种土壤水分消耗

While improved crop water-deficit tolerance is considered of primary importance, many phenotyping efforts focusing on quantifying structural root traits make assumptions about architecture representing root function. Therefore, the aim of this study was to quantify whole plant water-use traits among disparate peanut (Arachis hypogaeaL.) 基因型并确定它们对缺水耐受性的影响。安装了微型根瘤菌以评估基因型根结构和早期发育期间施加的两种灌溉制度的发育变化。在早期灌溉制度之后，通过以下措施研究了一系列土壤水分条件下的地上和地下特征：（a）叶级气体交换和（b）使用新型土壤水分探针量化的土壤水分消耗插入到微型根管中，允许匹配的根结构和土壤水分消耗措施。虽然不同的水处理影响了基因型之间的根系结构发育，但土壤水分消耗的位置主要取决于土壤剖面中的水分可用性，而不仅仅是在给定的土壤位置具有更大的根系长度。这与认为更大的根存在是增加根活性的一致指标的假设相矛盾。为提高作物水分利用效率而进行的根性状表型选择应考虑与未来栽培品种开发的预期生产环境相关的结构和功能性状。,虽然提高作物缺水耐受性被认为是最重要的，但许多专注于量化根结构性状的表型研究对代表根功能的结构做出了假设。因此，本研究的目的是量化不同花生（Arachis hypogaeaL.) 基因型并确定它们对缺水耐受性的影响。安装了微型根瘤菌以评估基因型根结构和早期发育期间施加的两种灌溉制度的发育变化。在早期灌溉制度之后，通过以下措施研究了一系列土壤水分条件下的地上和地下特征：（a）叶级气体交换和（b）使用新型土壤水分探针量化的土壤水分消耗插入到微型根管中，允许匹配的根结构和土壤水分消耗措施。虽然不同的水处理影响了基因型之间的根系结构发育，但土壤水分消耗的位置主要取决于土壤剖面中的水分可用性，而不仅仅是在给定的土壤位置具有更大的根系长度。这与认为更大的根存在是增加根活性的一致指标的假设相矛盾。为提高作物水分利用效率而进行的根性状表型选择应考虑与未来栽培品种开发的预期生产环境相关的结构和功能性状。