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PHYSIOLOGICAL AND BIOCHEMICAL RESPONSES OF BUSH BEAN (PHASEOLUS VULGARIS) TO OZONE AND DROUGHT STRESS
Citation:
Bender, J., D. Tingey, H. Jager, K. Rodecap, AND C. Clark. PHYSIOLOGICAL AND BIOCHEMICAL RESPONSES OF BUSH BEAN (PHASEOLUS VULGARIS) TO OZONE AND DROUGHT STRESS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-91/143 (NTIS PB91219014), 1991.
Description:
Bush bean (Phaseolus vulgaris L.) plants were exposed to ozone (O3) episodes in open-top chambers in early and late season studies at Corvallis, Oregon. lants were grown in cultural systems that controlled plant water status. he 7-h seasonal mean O3 concentrations were 0.067 and 0.054 ppm for the early and late season experiments, respectively. t anthesis, part of the plants were subjected to drought-stress treatment that was maintained for 14 days, after which it was relieved. oth O3 and drought-stress treatments affected physiological and biochemical processes in beans during their reproductive stages of development. easurements of water potential, osmotic potential and relative water content revealed a mild leaf drought stress in plants grown under water deficit conditions. rought stress increased the foliar concentrations of several nutrients (Mg, K, Fe, S, P), while O3 exposure had very little effect. t final harvest when plants had reached pod maturation, the concentrations of total soluble sugars were reduced by O3. oth O3 and drought stress significantly affected the sum of free amino acids. f all amino acids quantified, proline showed the most remarkable increase (up to threefold) to drought stress. zone exposure impaired osmoregulation to drought stress.
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PHYSIOLOGICAL AND BIOCHEMICAL RESPONSES OF BUSH BEAN (PHASEOLUS VULGARIS) TO OZONE AND DROUGHT STRESS