Ecophysiology of Mesosphaerum suaveolens (L.) Kuntze (Lamiaceae) under saline stress and salicylic acid

Author:

Nóbrega Jackson Silva1ORCID,Figueiredo Francisco Romário Andrade2ORCID,Silva Toshik Iarley da3ORCID,Fátima Reynaldo Teodoro de4ORCID,Ferreira Jean Telvio Andrade4ORCID,Ribeiro João Everthon da Silva1ORCID,Bruno Riselane de Lucena Alcântara1ORCID

Affiliation:

1. Universidade Federal da Paraíba (UFPB), Brazil

2. Universidade Federal Rural do Semi-Árido (UFERSA), Brazil

3. Universidade Federal de Viçosa (UFV), Brazil

4. Universidade Federal de Campina Grande (UFCG), Brazil

Abstract

ABSTRACT: Mesosphaerum suaveolens (L.) Kuntze is a species widely used in folk medicine and has a high aromatic and therapeutic potential. However, its cultivation in semi-arid regions can be limited by salts in the irrigation water. The objective of this study was to evaluate the effect of salicylic acid (SA) as a mitigator of saline stress on the growth and gas exchange of M. suaveolens. The experimental design used was the randomized blocks in an incomplete factorial scheme (Central Composite Design), with five electrical conductivities water (ECw = 0.5, 1.45, 5.0, 8.55, and 10.0 dS m-1) and five SA doses (0.0, 0.29, 1.0, 1.71, and 2.0 mM). Plant height, number of leaves, stem diameter, leaf area, root length, and height/diameter ratio, and gas exchange (stomatal conductance, net CO2 assimilation rate, transpiration rate, instantaneous, and intrinsic water use efficiency, instantaneous carboxylation efficiency, and leaf temperature) were evaluated. The application of 0.9 mM SA attenuates the negative effect of saline stress on the number of leaves and leaf area of M. suaveolens. The application of SA stimulates the number of leaves, plant height, and root growth, but does not affect the gas exchange of M. suaveolens. ECw reduces the growth and gas exchange of M. suaveolens plants.

Publisher

FapUNIFESP (SciELO)

Subject

General Veterinary,Agronomy and Crop Science,Animal Science and Zoology

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