Improving elms performance under drought stress: The pretreatment with abscisic acid

• Tipo: Artigo em Revista Científica Internacional
• Data: 2014

Autores

Dias, MC (Autor) Outra; Oliveira, H (Autor) Outra; Costa, A (Autor) Outra; Santos, C (Autor) Outra

Revista

Título: Environmental and Experimental Botany

Vol. 100

Páginas: 64-73

ISSN: 0098-8472

Editora: Elsevier

Indexação

ISI Web of Knowledge - 24 Citações

Scopus - 30 Citações

Outras Informações

ID Authenticus: P-008-ZAK

DOI: 10.1016/j.envexpbot.2013.12.013

Abstract (EN): Hormonal conditioning of plants in order to increase photosynthetic performance and reduce oxidative stress may improve plants' tolerance to stress. This study aims to elucidate the effects of ABA pretreatment on the photosynthetic apparatus and antioxidant battery of Ulmus minor plants under well watered (WW) and drought stress (DS) conditions. Leaves were sprayed with ABA (50 and 100 mu M). After 25 days of treatment DS was initiated by withholding water for 6 days. Water deficit decreased the RWC, induced stomatal closure and impaired net CO2 assimilation rate (A). However, independently of the water regime, ABA pretreatment increased plant DW accumulation, A, carotenoids and Ch1 a contents and reduced water loss. DS induced oxidative stress, but ABA application increased DS tolerance by the enhancement of the antioxidant system. Under WW conditions, the benefits of ABA application in reducing the cell membrane damages were noticeable. ABA pretreatment and DS induced changes in U. minor cell cycle of leaf cells, with a delay in S phase and an increase of FPCV coefficient. We propose that ABA pretreatment improves plant performance by increasing plant DW accumulation and augmenting the antioxidant system of U. minor plants, not only under DS conditions, but also under WW conditions. The use of ABA as pretreatment to alleviate the negative effects of DS seems to be a promising strategy to reduce plant's water loss and improve plant productivity in drought prone habitats.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10