Peanut (Arachis Hypogaea L) is an economic cash crop mainly planted in arid and semi-arid regions where drought causes approximately 20% yield losses every year. It has been demonstrated that drought tolerance can be achieved by two different mechanisms in plants: either by saving water or by extracting more water from the soil (water spender genotypes). The objective of this research was to screen for these two mechanisms of drought tolerance in peanut. Plants were grown in rainout shelters under irrigated conditions until mid-pod filling, then drought was induced using rain-out shelters. Gas exchange parameters were measured regularly during the drought period and recovery. Genotypes PI 502120 and AU-NPL 17 were classified as water spender genotypes as they showed high yield, Δ¹³C, photosynthesis, and stomatal conductance under drought. This is the first time that water spender genotypes have been identified in peanut. On the other hand, genotypes Line-8 and AU16-28 were classified as water savers as they showed equally high yields but with low Δ¹³C and stomatal conductance and moderate photosynthesis under drought stress. In this study, water spender genotypes did not show a yield advantage in comparison with water savers.

中文翻译：

---

花生耐旱可通过高水分利用效率或高效用水来实现

花生 ( Arachis Hypogaea L) 是一种经济经济作物，主要种植在干旱和半干旱地区，干旱导致每年约 20% 的产量损失。已经证明，植物的耐旱性可以通过两种不同的机制来实现：要么通过节水，要么通过从土壤中提取更多的水（耗水基因型）。本研究的目的是筛选花生耐旱的这两种机制。植物在灌溉条件下在避雨棚中生长，直到豆荚中部填充，然后使用避雨棚诱导干旱。在干旱期和恢复期定期测量气体交换参数。基因型 PI 502120 和 AU-NPL 17 被归类为耗水基因型，因为它们显示出高产量，Δ ¹³C，干旱下的光合作用和气孔导度。这是第一次在花生中鉴定出耗水基因型。另一方面，基因型 Line-8 和 AU16-28 被归类为节水型，因为它们表现出同样高的产量，但在干旱胁迫下具有低 Δ ¹³ C 和气孔导度和适度的光合作用。在这项研究中，与节水者相比，节水者基因型没有显示出产量优势。