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RESPONSE OF TWO OLD FIELD PERENNIALS TO INTERACTIONS OF CO 2 ENRICHMENT AND DROUGHT STRESS
Author(s) -
Wray Susan M.,
Strain Boyd R.
Publication year - 1986
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1986.tb10894.x
Subject(s) - advanced spaceborne thermal emission and reflection radiometer , perennial plant , biology , drought stress , andropogon , photosynthesis , old field , botany , agronomy , horticulture , remote sensing , digital elevation model , geology
Aster pilosus Willd. (aster, C 3 ) and Andropogon virginicus L. (broomsedge, C 4 ) were grown in growth chambers at 26/20 C day/night temperatures with a PPFD of 1,000 μ mol s –1 m –2 . Water was withheld for a 2‐wk drought period under three CO 2 concentrations (approximately 380, 500, and 650 μ l 1 –1 ). There were significant effects of CO 2 enrichment on aster so that drought stress did not occur in plants grown with CO 2 enrichment. Non‐watered plants with CO 2 enrichment had greater leaf water potentials, greater photosynthetic rates, and greater total dry wt than non‐watered plants grown at 380 μ l 1 –1 CO 2 . The response of broomsedge to drought was the same in all CO 2 treatments and there was no significant interaction of CO 2 enrichment and drought. The decreased severity of drought stress and the increased growth of aster with CO 2 enrichment may increase its competitive ability during droughts, allowing it to persist for longer periods during succession in abandoned fields.