Enhanced susceptibility of photosynthesis to high leaf temperature in triazine-resistant Solanum nigrum L. Evidence for photosystem II D1 protein site of action

Jean Marc Ducruet, Donald R. Ort

Research output: Contribution to journalArticle

Abstract

We have used nuclearly isogenic lines of Solanum nigrum, that differ genetically in the triazine-resistance trait, to investigate the mechanistic basis for the greater susceptibility of photosynthesis in resistant biotypes to elevated leaf temperature. Based on measurement of CO2-dependent oxygen evolution by leaf discs, of electron transfer partial reactions in isolated thylakoid membranes, and of chlorophyll fluorescence induction parameters of both leaves and thylakoid membranes, we conclude that: (1) The single base substitution in the chloroplast psb A gene that is responsible for triazine resistance is almost certainly also responsible for the decreased tolerance to high temperature; (2) The high temperature-induced inhibition of photosynthesis in the resistant biotype is caused by an inhibition of electron transfer between the primary and secondary quinone acceptors of photosystem II; (3) The enhanced temperature susceptibility is likely to be a significant contributing factor in the competitive disadvantage of triazine-resistant biotypes.

Original languageEnglish (US)
Pages (from-to)39-48
Number of pages10
JournalPlant Science
Volume56
Issue number1
DOIs
StatePublished - 1988

Keywords

  • D protein
  • Solanum nigrum L
  • chlorophyll fluorescence
  • methyl purple
  • photosystem II
  • triazine-resistance

ASJC Scopus subject areas

  • Genetics
  • Agronomy and Crop Science
  • Plant Science

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