ZINC TREATMENT RESULTS IN TRANSPIRATION RATE DECREASES THAT VARY AMONG SOYBEAN GENOTYPES

Walid Sadok, Thomas R. Sinclair

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Zinc (Zn) pollution of croplands can have negative impacts on yields through its effects on key physiological functions such as transpiration rate (TR). Previous long-term experiments indicated that differential tolerance among soybean genotypes following exposure to high Zn levels existed in the shoots. There are, however, no studies of the possibility that short-term responses to Zn directly limit shoot TR. Measurements of TR of eight soybean genotypes were measured over 220 minutes after placing de-rooted shoots in 500 μM Zn solution. Six genotypes exhibited TR that decreased slowly in a linear fashion over time while two genotypes ('PI 416937' and 'N01-11136') exhibited very rapid decrease in TR following a Boltzmann sigmoid response. One possibility to explain these results is that there exists a Zn-sensitive AQP population in the leaves of 'PI 416937' and 'N01-11136' with abundance or activity that is much higher than in the leaves of the remaining six lines.

Original languageEnglish (US)
Pages (from-to)1866-1877
Number of pages12
JournalJournal of Plant Nutrition
Volume35
Issue number12
DOIs
StatePublished - Sep 2012

Bibliographical note

Funding Information:
We gratefully acknowledge the financial support provided by the United Soybean Board.

Keywords

  • VPD
  • aquaporins
  • phytotoxicity
  • soybean
  • transpiration
  • zinc

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