Does shading mitigate water restriction in Ormosia arborea seedlings?

Q4 Agricultural and Biological Sciences
L. C. Reis, V. M. B. Freitas, S. P. Q. Scalon, A. Foresti, D. Dresch, C. C. Santos
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引用次数: 1

Abstract

Abstract This study aimed to evaluate the potential of shading in reducing the stressful effect of water restriction on photosynthetic and antioxidant metabolism, favoring the growth of Ormosia arborea seedlings and the recovery metabolic. The shadings levels studied were: 0, 30 and 70%. Two water regimes were implemented: control, in which the plants were irrigated at 75% of soil water retention capacity and water restriction, in which the irrigation was suspended until the photosynthetic rate reached values close to zero (P0), period at which the seedlings were re-irrigated. There were two evaluation periods: P0 and recovery. We observed that water restriction reduced photosynthetic metabolism, growth and quality of O. arborea seedlings by increasing the activity of antioxidant enzymes. The seedlings present higher quality index, stomatal conductance, intrinsic carboxylation efficiency and transpiration when cultivated under 70% shading in recovery. The stressful effect of water restriction was mitigated by the shading of 70%, where the seedlings were able to recover, resuming their photosynthetic metabolism and quality after resumption of irrigation. In addition, 0% shading is not indicated for this species.
遮荫是否减轻了红豆幼苗的水分限制?
摘要本研究旨在探讨遮荫在降低限水胁迫对红豆幼苗光合和抗氧化代谢的影响,促进红豆幼苗生长和恢复代谢方面的潜力。研究的遮阳水平为:0、30和70%。实施了两种水处理方案:控制,即以75%的土壤保水能力灌溉植株;限水,即暂停灌溉,直到光合速率达到接近零(P0)的值,在此期间重新灌溉幼苗。分为P0期和恢复期两个评价期。研究发现,水分限制通过增加抗氧化酶的活性,降低了杉木幼苗的光合代谢、生长和品质。在70%遮荫条件下,幼苗在恢复期表现出较高的品质指数、气孔导度、内在羧化效率和蒸腾速率。70%的遮荫减轻了水分限制的胁迫效应,使幼苗能够恢复,恢复灌溉后的光合代谢和质量。此外,该物种没有显示0%的阴影。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Rodriguesia
Rodriguesia Agricultural and Biological Sciences-Horticulture
CiteScore
1.00
自引率
0.00%
发文量
55
审稿时长
13 weeks
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