Drought, heat, and their combined effect on the photosynthetic performance of Psidium myrtoides O. Berg (Myrtaceae)

Q3 Agricultural and Biological Sciences

Revista Ceres Pub Date : 2023-01-01 DOI:10.1590/0034-737x202370050002

Icaro Leite Souza, Ramon Negrão Santos Junior, Leonardo Faria-Silva, Diolina Moura Silva

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Abstract

Popularly known as araçá-una, Psidium myrtoides is an endemic tree species in Brazil, with fruits much appreciated by the fauna. It is indicated for the composition of reforestation and for enriching the vegetation of degraded areas. This work aimed to evaluate the effects of drought, heat, and the interaction of both in the physiological attributes of Psidium myrtoides plants. Monitored fluorescence, gas exchange, and chlorophyll index in araçá-una plants induced by drought, heat, and the combination of both during 1, 3, and 7 days after treatment induction (DAT). After, the plants were returned to their initial condition, and their recovery was evaluated at 15 DAT. The results indicate that Psidium myrtoides plants reduce photosynthetic activity in the absence of water, contrary to what has been shown in other studies; in addition, they are not potentiated by the combination with heat. Therefore, we conclude that this species has a potential tolerance to heat (Tmean 30.3 °C). However, if water is available in the soil, it maintains photosynthetic activity at normal levels.

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干旱、高温及其对桃金娘科桃金娘光合性能的影响

俗称araçá-una，桃金娘Psidium myrtoides是巴西的一种特有树种，其果实深受动物群的喜爱。它可用于再造林的组成和丰富退化地区的植被。本研究旨在探讨干旱、高温及其相互作用对桃金娘植物生理特性的影响。在处理诱导(DAT)后1、3和7 d，监测干旱、高温和两者联合诱导araçá-una植株的荧光、气体交换和叶绿素指数。之后，将植物恢复到初始状态，并在15dat时评估其恢复情况。研究结果表明，在缺水的情况下，桃金娘石楠会降低光合活性，这与其他研究结果相反;此外，它们不因与热结合而增强。因此，我们得出结论，该物种具有潜在的耐热性(平均30.3℃)。然而，如果土壤中有水，它将光合作用维持在正常水平。

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来源期刊

Revista Ceres Veterinary-Veterinary (all)

CiteScore

1.10

自引率

0.00%

发文量

审稿时长

16 weeks

期刊介绍： Ceres Journal is a journal bimonthly published by Universidade Federal de Viçosa (Federal University of Viçosa - UFV). It is intended for the publication of unpublished scientific papers, with technical and scientific relevance, resulting from studies related to innovations and solutions to the problems of agriculture, with emphasis on tropical-related studies. Ceres publishes papers ni: -Plant production -Soil and plant nutrition -Plant breeding applied to agriculture -Plant Health -Physiology and morphology applied to agriculture -Vegetative and seminiferous propagation -Agricultural Engineering (specifically: Irrigation and Drainage; Soil Physics; Agrometeorology; Precision ---Agriculture; Technology and Application of Pesticides) -Animal production and health applied to agriculture