Drought stress mitigation with humic acid in two Cucumis melo L. genotypes differ in their drought tolerance

Servinç Kıran,Gökçen Baysal Furtana,Şeküre Şebnem Ellialtıoğlu,Manar Talhouni

doi:10.1590/1678-4499.20190057

Servinç Kıran, Gökçen Baysal Furtana + Show 2 more

Open Access

https://doi.org/10.1590/1678-4499.20190057

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Journal: Bragantia	Publication Date: Dec 1, 2019
Citations: 22	License type: CC BY 4.0

Affiliation: Gazi University, Ankara University

Abstract

ABSTRACT Different responses of two melon (Cucumis melo L.) genotypes (Semame, drought and salt-tolerant and Ananas, drought and salt-sensitive) to drought stress with or without humic acid (HA) treatment were studied. The experiment was carried out under greenhouse conditions. The experimental design was two factorial randomized block with 4 replicates. HA treatment increased the shoot fresh and dry weights and leaf area of both genotypes under drought stress. HA stimulated accumulation of K and Ca ions, chlorophyll (SPAD value) and antioxidant enzyme activity (superoxide dismutase-SOD, catalase-CAT and glutathione reductase-GR) in both genotypes. This effect was more clear in the Semame genotype than in Ananas.As a result, HA treatment has been proved to influence the ability of melon genotypes to cope with drought stress and to increase their tolerance.

Highlights

Water deficit is generally known as drought and is expressed as the absence of the necessary water for normal plant growth and life cycle (Zhu 2002)
Fresh and dry weights of shoot-root, lengths of shoot-root and leaf area were decreased in both melon (Cucumis melo L.) genotypes as a response to drought stress (Table 2 and Fig. 1)
The accumulation and the roles of osmotic dissolutions have been revealed under drought stress

Summary

Introduction

Water deficit is generally known as drought and is expressed as the absence of the necessary water for normal plant growth and life cycle (Zhu 2002). Drought or water deficit considerably affects vegetable production in many parts of the world. It disturbs plant water relationships, reducing leaf size, root growth and root multiplication. Various mechanisms have been developed by drought-tolerant plants to adapt to the stress. Examples of these mechanisms are: increased water uptake by developing large and deep root systems, reduction of water loss by accumulation of osmolites, prevention of membrane disintegration and enzyme activation, and increase in K and Ca ions uptake (Mahajan and Tuteja 2005; Lotfi et al 2015; Kaya et al 2018)

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