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Expressions of ABA biosynthesis genes and catabolism genes are generally co-regulated in plant development and responses to environmental stress. Up-regulation of  OsNCED3  gene, a key gene in ABA biosynthesis, has been suggested as a way to enhance plant drought resistance but little is known for the role of ABA catabolic genes during drought stress. In this study, we found that  OsABA8ox3  was the most highly expressed gene of the  OsABA8ox  family in rice leaves. Expression of  OsABA8ox3  was promptly induced by rehydration after PEG-mimic dehydration, a tendency opposite to the changes of ABA level. We therefore constructed rice  OsABA8ox3  silencing (RNA interference, RNAi) and overexpression plants. There were no obvious phenotype differences between the transgenic seedlings and wild type under normal condition. However,  OsABA8ox3  RNAi lines showed significant improvement in drought stress tolerance while the overexpression seedlings were hypersensitive to drought stress when compared with wild type in terms of plant survival rates after 10 days of unwatering. Enzyme activity analysis indicated that  OsABA8ox3  RNAi plants had higher superoxide dismutase (SOD) and catalase (CAT) activities and less malondialdehyde (MDA) content than those of wild type when the plants were exposed to dehydration treatment, indicating a better anti-oxidative stress capability and less membrane damage. DNA microarray and real-time PCR analysis under dehydration treatment revealed that expressions of a group of stress/drought-related genes, i.e.  LEA  genes, were enhanced with higher transcript levels in  OsABA8ox3  RNAi transgenic seedlings. We therefore conclude that that  OsABA8ox3  gene plays an important role in controlling ABA level and drought stress resistance in rice.

A Key ABA Catabolic Gene, OsABA8ox3, Is Involved in Drought Stress Resistance in Rice