Identification of drought tolerance determinants by genetic analysis of root response to drought stress and abscisic acid

Liming Xiong*, Rui Gang Wang, Guohong Mao, Jessica M. Koczan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

259 Scopus citations

Abstract

Drought stress is a common adverse environmental condition that seriously affects crop productivity worldwide. Due to the complexity of drought as a stress signal, deciphering drought tolerance mechanisms has remained a major challenge to plant biologists. To develop new approaches to study plant drought tolerance, we searched for phenotypes conferred by drought stress and identified the inhibition of lateral root development by drought stress as an adaptive response to the stress. This drought response is partly mediated by the phytohormone abscisic acid. Genetic screens using Arabidopsis (Arabidopsis thaliana) were devised, and drought inhibition of lateral root growth (dig) mutants with altered responses to drought or abscisic acid in lateral root development were isolated. Characterization of these dig mutants revealed that they also exhibit altered drought stress tolerance, indicating that this root response to drought stress is intimately linked to drought adaptation of the entire plant and can be used as a trait to access the elusive drought tolerance machinery. Our study also revealed that multiple mechanisms coexist and together contribute to whole-plant drought tolerance.

Original languageEnglish (US)
Pages (from-to)1065-1074
Number of pages10
JournalPlant physiology
Volume142
Issue number3
DOIs
StatePublished - Nov 1 2006

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science

Fingerprint

Dive into the research topics of 'Identification of drought tolerance determinants by genetic analysis of root response to drought stress and abscisic acid'. Together they form a unique fingerprint.

Cite this