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Advances in Crop Science and Technology

.: Home > Advances in Crop Science and Technology > 2015 > Volume 3 Number 3 > Alyne Oliveira Lavinsky*, Paulo César Magalhães, Roniel Ávila, Carlos César Gomes-Jr and Newton Portilho Carneiro

Analysis of Maize Photosyntheis Parameters and Whole Plant Oxidative Damage Under Long-term Drought

Alyne Oliveira Lavinsky*, Paulo César Magalhães, Roniel Ávila, Carlos César Gomes-Jr and Newton Portilho Carneiro
Embrapa Milho e Sorgo, Rodovia MG-424, Km 45 Caixa Postal: 285 ou 151 CEP: 35701-970, Sete Lagoas, MG, Brazil
Abstract :

We test if maize maintain yield under long-term drought throught improvement of photosyntheis (A) coupled with up-regulation of the antioxidant system induced by increase in levels of abscisic acid (ABA). Four maize genotypes with constrasting drought tolerance: BRS1010 and 2B710 (sensitive) and DKB 390 and BRS1055 (tolerant) in two soil water levels, field capacity (FC) and water deficit (WD) were used. WD was applied at the pre-flowering stage for 12 days, and oxidative damage was measured as malondialdehyde (MDA) accumulation in whole plant. Plants from tolerant genotypes DKB390 and BRS1055 showed higher A and had no signal of oxidative damage compared to sensitive genotypes 2B710 and BRS1010 under WD, resulting in a higher yield attributes. For our surprising, it was dissociated from up-regulation of the antioxidant system ABA-mediated. In turn, plants from two sensitive genotypes under WD showed compared to FC consistent reduction of A due to mesophyll conductance (gm) limitation. Only WD plants from sensitive genotype BRS1010 presented leaf ABA levels increased related to its counterparts under FC; however, due to the inactivation of catalase activity the oxidative damage control was not effective, resulting a hardly MDA acumulation in both leaves and roots. The maize tolerance under long-term drought is linked to scape of gm decline.

Keywords :
Antioxidant system; Mesophyll conductance; Malondialdehyde; Photorespiration; Abscisic acid

Date Deposited : 04 Apr 2016 12:17

Last Modified : 04 Apr 2016 12:17

Official URL: http://www.esciencecentral.org/journals/archive-advances-in-crop-science-and-technology-open-access.php

Volume 3, Number 3, May 2015 , ISSN ISSN: 2329-8863

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