葡萄树拂晓前的叶片水势不一定能很好地反映土壤水分状况。
Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture.
机构信息
Department of Viticulture and Enology, Irrigated Agriculture Research and Extension Center, Washington State University, Prosser, WA, USA.
Present Address: Central and Northern Arava Research and Development Center, Hatzeva, Israel.
出版信息
BMC Plant Biol. 2023 Jul 25;23(1):369. doi: 10.1186/s12870-023-04378-6.
BACKGROUND
In plant water relations research, predawn leaf water potential (Ψ) is often used as a proxy for soil water potential (Ψ), without testing the underlying assumptions that nighttime transpiration is negligible and that enough time has passed for a hydrostatic equilibrium to be established. The goal of this research was to test the assumption Ψ = Ψ for field-grown grapevines.
RESULTS
A field trial was conducted with 30 different cultivars of wine grapes grown in a single vineyard in arid southeastern Washington, USA, for two years. The Ψ and the volumetric soil water content (θ) under each sampled plant were measured multiple times during several dry-down cycles. The results show that in wet soil (Ψ > - 0.14 MPa or relative extractable water content, θ > 0.36), Ψ was significantly lower than Ψ for all 30 cultivars. Under dry soil conditions (Ψ < - 0.14 MPa or θ < 0.36) Ψ lined up better with Ψ. There were differences between cultivars, but these were not consistent over the years.
CONCLUSION
These results suggest that for wet soils Ψ of grapevines cannot be used as a proxy for Ψ, while the Ψ = Ψ assumption may hold for dry soils.
背景
在植物水分关系研究中，常常用黎明前叶片水势（Ψ）来替代土壤水势（Ψ），而没有检验夜间蒸腾可以忽略不计且达到静水压力平衡所需时间这两个基本假设。本研究的目的是检验大田生长的葡萄植株中 Ψ= Ψ这一假设。
结果
在干旱的美国华盛顿东南部的一个单一葡萄园里，对 30 种不同的酿酒葡萄品种进行了为期两年的田间试验。在几次干燥循环中，对每个采样植株下的 Ψ 和体积土壤含水量（θ）进行了多次测量。结果表明，在湿润土壤（Ψ> -0.14 MPa 或相对可提取水含量，θ>0.36）中，所有 30 个品种的 Ψ 均显著低于 Ψ。在干燥土壤条件下（Ψ< -0.14 MPa 或 θ<0.36），Ψ 与 Ψ 更接近。不同品种之间存在差异，但这些差异并不稳定。
结论
这些结果表明，在湿润土壤中，葡萄的 Ψ 不能作为 Ψ 的替代物，而在干燥土壤中， Ψ= Ψ 的假设可能成立。
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