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Effects of low concentrations of O 3 , leaf age and water stress on leaf diffusive conductance and water use efficiency in soybean
Author(s) -
Reich Peter B.,
Schoettle Anna W.,
Amundson Robert G.
Publication year - 1985
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1985.tb02818.x
Subject(s) - conductance , stomatal conductance , water stress , horticulture , botany , biology , transpiration , glycine , chemistry , photosynthesis , biochemistry , mathematics , amino acid , combinatorics
Ozone, leaf age and water stress each affected leaf conductance in soybean [ Glycine max (L.) Merr. Hodgson], but there were no interactions among these factors. Exposure to increased concentrations of O 3 (0.01, 0.05, 0.09. and 0.13 μl l −1 ) resulted in linear declines in abaxial and adaxial conductances in leaves of all ages. There were no differences in relative response to O 3 between the two leaf surfaces. For well‐watered plants, water use efficiency also decreased with exposure to increased O 3 concentrations (water‐stressed plants were not tested). Abaxial conductance increased as leaves aged from 4 to 10 days and then declined with further aging. Adaxial conductance decreased with all increases in leaf age beyond 4 days, and the ratio of abaxial/adaxial conductance increased continuously throughout the leaf lifespan. During water‐stress cycles (water withheld for 2–3 days) leaves of water‐stressed plants had lower conductances than those from well‐watered plants, and there was no difference in relative response between abaxial and adaxial stomata.