Evolution of C3 and C4 plants along an environmental moisture gradient: patterns of photosynthetic differentiation in Hawaiian Scaevola and Euphorbia species.

R. H. Robichaux, R. W. Pearcy

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Light-saturated photosynthetic capacities range from 12.0n24.7 mu mol CO2 m-2 s-1 in the Scaevola species and from 18.2-51.4 mu mol CO2 m-2s-1 in the Euphorbia species. Within each genus, differences in light-saturated photosynthetic capacity are paralleled by differences in mesophyll and leaf conductances to CO2. Within each habitat, the C4 Euphorbia species exhibits a significantly higher photosynthetic capacity and a significantly higher mesophyll conductance than the corresponding C3, Scaevola species, differences greatest in the dry scrub habitat and least in the wet forest habitat. One photosynthetic characteristic that exhibits little variation among the species within each genus, yet that exhibits a consistently large difference between the species within each habitat, is photosynthetic water-use efficiency. The C4 Euphorbia species possess water-use efficiencies that are 2-3.5 times as high as those of the C3 Scaevola species. -from Authors

Original languageEnglish (US)
Pages (from-to)121-129
Number of pages9
JournalAmerican journal of botany
Volume71
Issue number1
DOIs
StatePublished - Jan 1 1984
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Plant Science

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