Short-term water stress responses of grafted pepper plants are associated with changes in the hormonal balance

Frontiers in Plant Science

Plant Science

Yaiza Gara Padilla¹  Ángeles Calatayud¹  Ramón Gisbert-Mullor²  Salvador López-Galarza²  Purificación A. Martínez-Melgarejo³  Alfonso Albacete⁴ 

[1] Departamento de Horticultura, Instituto Valenciano de Investigaciones Agrarias, Moncada, Valencia, Spain;Departamento de Producción Vegetal, Centro Valenciano de Estudios sobre el Riego (CVER), Universitat Politècnica de València, Valencia, Spain;Department of Plant Nutrition, Centro de Edafología y Biología Aplicada del Segura (CEBAS-CSIC), Murcia, Spain;Department of Plant Nutrition, Centro de Edafología y Biología Aplicada del Segura (CEBAS-CSIC), Murcia, Spain;Institute for Agro-Environmental Research and Development of Murcia (IMIDA), Department of Plant Production and Agrotechnology, Murcia, Spain;

关键词: Capsicum annuum;    drought stress;    leaves;    phytohormones;    root;    water use efficiency;   

DOI  :  10.3389/fpls.2023.1170021

 received in 2023-02-20, accepted in 2023-04-05,  发布年份 2023

来源: Frontiers

【 摘 要 】

Phytohormones play an important role in regulating the plant behavior to drought. In previous studies, NIBER® pepper rootstock showed tolerance to drought in terms of production and fruit quality compared to ungrafted plants. In this study, our hypothesis was that short-term exposure to water stress in young, grafted pepper plants would shed light on tolerance to drought in terms of modulation of the hormonal balance. To validate this hypothesis, fresh weight, water use efficiency (WUE) and the main hormone classes were analyzed in self-grafted pepper plants (variety onto variety, V/V) and variety grafted onto NIBER® (V/N) at 4, 24, and 48h after severe water stress was induced by PEG addition. After 48h, WUE in V/N was higher than in V/V, due to major stomata closure to maintain water retention in the leaves. This can be explained by the higher abscisic acid (ABA) levels observed in the leaves of V/N plants. Despite the interaction between ABA and the ethylene precursor, 1-aminocyclopropane-1-carboxylic acid (ACC), in relation to stomata closure is controversial, we observed an important increase of ACC at the end of the experiment in V/N plants coinciding with an important rise of the WUE and ABA. The maximum concentration of jasmonic acid and salicylic acid after 48h was found in the leaves of V/N, associated with their role in abiotic stress signaling and tolerance. Respect to auxins and cytokinins, the highest concentrations were linked to water stress and NIBER®, but this effect did not occur for gibberellins. These results show that hormone balance was affected by water stress and rootstock genotype, where NIBER® rootstock displayed a better ability to overcome short-term water stress.

【 授权许可】

Unknown   
Copyright © 2023 Padilla, Gisbert-Mullor, López-Galarza, Albacete, Martínez-Melgarejo and Calatayud