Responses in gas exchange and water status between drought-tolerant and -susceptible soybean genotypes with ABA application

Md Mokter Hossain, Hon Ming Lam, Jianhua ZHANG*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

27 Citations (Scopus)


The purpose of this study was to investigate the physiological responses of drought-tolerant and drought-susceptible soybean genotypes to exogenous abscisic acid (ABA) application during progressive soil drying at seedling stages. Five-day old soybean seedlings were transplanted into PVC tubes filled with soil mixture. Seedlings were watered daily with similar water volumes until second trifoliate leaves emerged, and thereafter soil drying with or without exogenous ABA application was imposed. Half of the seedlings of each genotype were left for regular watering as control plants. Soil water status declined significantly over seven days of withholding water supply for both genotypes. Leaf expansion rate, stomatal conductance (gs), leaf water potential (ψw), and relative water content of leaves (%RWC) declined significantly under soil drying as well as soil drying with ABA application, compared to their values for well-watered soybean genotypes. However, a drought-tolerant genotype (C12) responded more rapidly than a drought-susceptible genotype (C08) after imposition of soil drying and soil drying with exogenous ABA. In addition, application of exogenous ABA to water-restricted soybeans resulted in higher %RWC and ψw in the drought-tolerant than in the drought-susceptible genotype. Compared to the drought-susceptible genotype, the drought-tolerant genotype was more responsive to exogenous ABA application, resulting in a higher root-to-shoot ratio.

Original languageEnglish
Pages (from-to)500-506
Number of pages7
JournalCrop Journal
Issue number6
Publication statusPublished - 1 Dec 2015

Scopus Subject Areas

  • Agronomy and Crop Science
  • Plant Science

User-Defined Keywords

  • Drought stress
  • Exogenous ABA
  • Leaf relative water content
  • Soybean genotypes
  • Stomatal conductance


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