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Plant and Cell Physiology Advance Access published online on June 22, 2009
Plant and Cell Physiology, doi:10.1093/pcp/pcp082
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Physiological and Molecular Approaches to Improve Drought Resistance in Soybean

Lakshmi P. Manavalan1, Satish K. Guttikonda1, Lam-Son Phan Tran1,2,* and Henry T. Nguyen1,*

1National Center for Soybean Biotechnology and Division of Plant Sciences, University of Missouri, Columbia, Missouri 65211, USA

Corresponding author: Dr. Lam- Son Phan Tran, Signaling Pathway Research Unit, Gene Discovery Research Group, RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, JAPAN 230-0045, Tel. (81)-45-503-9593, Fax. (81)-45-503-9591, Email: tran{at}psc.riken.jp or Henry T. Nguyen, 2-24 Agriculture Bldg, University of Missouri Columbia, MO 65211-7140, Tel: 573-882-5494, Fax: 573-882-1469, nguyenhenry{at}missouri.edu


  Abstract

Drought stress is a major constraint to the production and yield stability of soybean (Glycine max (L.) Merr.). For developing high yielding varieties under drought conditions, the most widely employed criterion has traditionally been direct selection for yield stability over multiple locations. However, this approach is time consuming and labor intensive, because yield is a highly quantitative trait with low heritability, and influenced by differences arising from soil heterogeneity and environmental factors. The alternative strategy of indirect selection using secondary traits has succeeded only in a few crops, due to problems with repeatability and lack of phenotyping strategies, especially for root related traits. Considerable efforts have been directed towards identifying traits associated with drought resistance in soybean. With the availability of the whole genome sequence, physical maps, genetics and functional genomics tools, integrated approaches using molecular breeding and genetic engineering offer new opportunities for improving drought resistance in soybean. Genetic engineering for drought resistance with candidate genes has been reported in the major food crops, and efforts for developing drought resistant soybean lines are in progress. The objective of this article is to consolidate the current knowledge of physiology, molecular breeding and functional genomics which may be influential in integrating breeding and genetic engineering approaches for drought resistance in soybean.

Keywords: Soybean (Glycine max (L.) Merr.) - Drought resistance - Genetic engineering - Marker assisted selection - Physiological traits

2 Current address Signaling Pathway Research Unit, Gene Discovery Research Group, RIKEN Plant Science Center, 1-7-22 Suehiro, Tsurumi, Yokohama, Japan 230-0045

(Received April 13, 2009; Accepted June 4, 2009)
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