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PMID: 16963523 Published · ppublish English Journal Article Research Support, U.S. Gov't, Non-P.H.S.

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

Plant physiology ·Vol. 142 ·No. 3 ·2006-11-00 ·Pages 1065-74

Xiong L, Wang RG, Mao G, Koczan JM

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.

MeSH Terms
Abscisic Acid/pharmacology Arabidopsis/drug effects,genetics,metabolism Arabidopsis Proteins/genetics,metabolism Desiccation Disasters Gene Expression Profiling Gene Expression Regulation, Plant/drug effects Mannitol Mutation Plant Roots/drug effects,genetics,metabolism Water-Electrolyte Balance
Chemicals
Arabidopsis Proteins Mannitol Abscisic Acid
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Xiong Liming
Donald Danforth Plant Science Center, St. Louis, Missouri 63132, USA. [email protected]
Wang Rui-Gang
Mao Guohong
Koczan Jessica M
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Article Info
Journal
Plant physiology
Abbr.
Plant Physiol
ISSN
0032-0889
DOI
10.1104/pp.106.084632
Email
[email protected]
Published
2006-11-00
Epub
2006-00-08
Pages
1065-74
Language
English
Region
United States
NLM ID
0401224
PMCID
PMC1630748
Subset
IM
External Links
PubMed source DOI: 10.1104/pp.106.084632 PMC Full Text View journal details
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