Perspectives on Drought Preconditioning Treatments With a Case Study Using Western Larch.
Perspectives on Drought Preconditioning Treatments With a Case Study Using Western Larch.
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DOI：
10.3389/fpls.2021.741027
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发表时间：
2021
影响因子：
5.6
通讯作者：
Nelson AS
中科院分区：
文献类型：
--
作者：
Moler ERV;Nelson AS
随着对抗旱树苗的需求随着全球气温的升高而上升，有必要优化苗木干旱预适应方法，以提高种植苗木的田间表现。这篇观点文章主张对干旱预适应研究采取更全面的方法，考虑植物发育阶段对干旱预适应影响的调节作用。我们找出了过去根生长潜力(RGP)对干旱预适应响应的研究中的差异，并强调了一些研究表明，这种差异可能是由于干旱预适应实施时间的研究之间的不一致所致。然后，我们通过展示一年生西部落叶松(Larix ocsidentalis Nutt.)的气培RGP试验的原始研究来说明我们的观点。幼苗在三种土壤水分条件下暴露6个月。我们评估了干旱预适应是否可以在随后的生长期内用来增加根与叶组织质量的比例或增强幼苗的生理活力。干旱预适应增加了根叶组织质量比，增强了幼苗的生理活力。土壤水分含量与新根生物量呈负相关，与新根生物量呈正相关，与新根长和新根数呈负相关(p<；0.001)。同时，在气培生长之前的干旱预处理后，侧根的质量与气培生长过程中产生的新根的质量、数量和长度之间的相关性很弱。我们认为，评估干旱预适应处理时机的重要性构成了植物科学中的一个重要研究前沿。
As the demand for drought hardy tree seedlings rises alongside global temperatures, there is a need to optimize nursery drought preconditioning methods to improve field performance of planted seedlings. This perspective article advocates for a more holistic approach to drought preconditioning research that considers the moderating role of plant developmental stage on the effects of drought preconditioning. We identify discrepancies in past studies of root growth potential (RGP) responses to drought preconditioning and highlight studies that suggest such discrepancies may result from inconsistencies among studies in the timing of drought preconditioning implementation. We then illustrate our perspective by presenting original research from an aeroponic RGP trial of 1st-year western larch (Larix occidentalis Nutt.) seedlings exposed to three soil moisture contents for 6months. We evaluated whether drought preconditioning could be used to increase the ratio of root: foliar tissue mass or enhance seedling physiological vigor during a subsequent growth period. Drought preconditioning was found to increase the ratio of root: foliar tissue mass and enhance seedling physiological vigor. Specifically, soil moisture content related negatively with new root biomass, positively with new foliar biomass, and negatively with the length and number of new roots (p<0.001). Meanwhile, the mass of lateral root production following drought preconditioning, but prior to aeroponic growth, correlated weakly to the mass, count, and length of new roots produced during aeroponic growth. We propose that evaluating the importance of the timing of drought preconditioning treatments constitutes an important research frontier in plant science.
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影响因子：
2.6
作者：
Alvarez, Sara;Banon, Sebastian;Jesus Sanchez-Blanco, M.
通讯作者：
Jesus Sanchez-Blanco, M.
影响因子：
2.3
作者：
Guarnaschelli, AB;Lemcoff, JH;Basci, SO
通讯作者：
Basci, SO
影响因子：
2.2
作者：
VANDENDRIESSCHE, R
通讯作者：
VANDENDRIESSCHE, R
影响因子：
3
作者：
Benigno, Stephen M.;Dixon, Kingsley W.;Stevens, Jason C.
通讯作者：
Stevens, Jason C.
影响因子：
2.2
作者：
Grossnickle, Steven C.
通讯作者：
Grossnickle, Steven C.