DNA Alteration and Programmed Cell Death During Ageing of Sunflower Seed

Overview

Journal J Exp Bot

Publisher Oxford University Press

Specialty Biology

Date 2011 Jul 19

PMID 21765164

Citations 39

Authors

Hayat El-Maarouf-Bouteau

Claire Mazuy

Francoise Corbineau

Christophe Bailly

Affiliations

Soon will be listed here.

Abstract

Sunflower (Helianthus annuus L.) seed viability is affected by moisture content (MC) during ageing and is related to accumulation of hydrogen peroxide and changes in energy metabolism. The aim of the present work was to investigate the effect of ageing on DNA alteration events by RAPD (random amplification of polymorphic DNA) analysis and to determine whether loss of seed viability might correspond to a controlled programmed cell death (PCD). Ageing of sunflower seeds was carried out at 35 °C for 7 d at different MCs. The higher the MC, the lower was the seed viability. RAPD analysis showed that DNA alterations occurred during ageing especially in seeds containing a high MC. In addition, PCD, as revealed by DNA fragmentation and TUNEL (terminal deoxynucleotide transferase-mediated dUTP nick-end labelling) assay, was detected in aged seeds at MCs which resulted in ∼50% seed viability. At the cellular level, TUNEL assay and propidium iodide staining showed that cell death concerns all the cells of the embryonic axis. The quantification of the adenylate pool highlights mitochondrial dysfunction in aged seeds containing a high MC. The involvement of oxidative burst, mitochondria dysfunction, and PCD in seed loss of viability is proposed.

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