Drought tolerance in citrus rootstocks is associated with better antioxidant defense mechanism

Hussain Sajjad, Fasih Khalid Muhammad, Saqib Muhammad, Ahmad Shakeel, Zafar Waseem, Junaid Rao Muhammad, Morillon Raphaël, Akbar Anjum Muhammad. 2018. Drought tolerance in citrus rootstocks is associated with better antioxidant defense mechanism. Acta Physiologiae Plantarum, 40:135, 10 p.

Quartile : Q2, Sujet : PLANT SCIENCES

Résumé : Citrus is one of the major fruit crops grown worldwide. Citrus trees are affected by different abiotic stresses including drought which decrease its yield. In this study, six different citrus rootstocks (Volkameriana lemon, Brazilian sour orange, Carrizo citrange, Eureka lemon, Gada dahi, and Rangpur lime) were subjected to drought stress (24 days) and leaf relative water content (LRWC), chlorophyll 'a' and 'b', antioxidant capacity (AC), total phenolic content, and proline content (PRO) were measured. Hydrogen peroxide (H2O2), lipid peroxidation (MDA), total soluble proteins (TSP), and enzymatic antioxidant activities, such as superoxidase dismutase (SOD), catalase (CAT), and peroxidase (POD), were measured in leaves and roots of the rootstocks. Drought-stressed Volkameriana lemon had the minimum LRWC but higher SOD activity in its leaves. Carrizo citrange possessed the minimum amount of Chl 'a' and 'b' in leaves and exhibited lesser MDA and H2O2 in roots but greater TSP content in leaves and roots. SOD, CAT, POD, PRO, MDA, H2O2, and AC decreased in the leaves of Eureka lemon and Rangpur lime under drought stress. MDA and H2O2 contents were observed higher in leaves of Brazilian sour orange (a drought sensitive rootstock). However, higher SOD activity in roots and higher CAT and POD activities in leaves and roots were recorded in Carrizo citrange (a drought-tolerant rootstock). The results indicated that all the studied rootstocks were different in their defense mechanism. Tolerant rootstocks exhibited less amount of MDA and H2O2 and more antioxidant enzymatic activities (SOD, CAT, and POD) to cope with reactive oxygen species produced during drought stress.

Mots-clés libres : Citrus, Rootstock, Drought, Antioxidant

Classification Agris : F01 - Culture des plantes
F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Hussain Sajjad, Bahauddin Zakariya University (PAK)
• Fasih Khalid Muhammad, Bahauddin Zakariya University (PAK)
• Saqib Muhammad, Bahauddin Zakariya University (PAK)
• Ahmad Shakeel, International Institute of Information Technology (PAK)
• Zafar Waseem, Bahauddin Zakariya University (PAK)
• Junaid Rao Muhammad, Bahauddin Zakariya University (PAK)
• Morillon Raphaël, CIRAD-BIOS-UMR AGAP (GLP)
• Akbar Anjum Muhammad, Bahauddin Zakariya University (PAK) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/589292/)

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