Leaf movement, stress avoidance and photosynthesis in Vitis californica

J. A. Gamon, R. W. Pearcy

Research output: Contribution to journalArticlepeer-review

122 Scopus citations

Abstract

Gas exchange and chlorophyll fluorescence techniques were used to evaluate the hypothesis that leaf movement in Vitis californica Benth. (California wild grape) allows a compromise between sunlight interception and stress damage in order to maximize photosynthetic carbon gain over the life of the leaf. Leaves that were restrained horizontally tolerated their increased radiation loads if critical temperatures were not exceeded. Reductions in photosynthetic capacity and the FV/FM fluorescence ratio only occurred in leaves that attained high temperatures. Leaf orientation and canopy position were important determinants of leaf temperature. These results indicate that excessive leaf temperature, not high PFD, can be a principle cause of reduced carbon gain and senescence in this species in the wild. Leaf movement appears to protect photosynthetic components in midsummer.

Original languageEnglish (US)
Pages (from-to)475-481
Number of pages7
JournalOecologia
Volume79
Issue number4
DOIs
StatePublished - Jun 1989
Externally publishedYes

Keywords

  • Heat stress
  • Leaf movement
  • Photoinhibition
  • Photosynthesis
  • Vitis californica

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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