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Abscisic Acid Concentration In Leaf And Xylem Sap, Leaf Water Potential, And Stomatal Conductance In Maize

R. Tuberosa, M. C. Sanguineti, P. Landi
Published 1994 · Biology

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Genetic variation of and the relationships among abscisic acid (ABA) concentration in the bulk-leaf tissue (L-ABA) and xylem sap (X-ABA), bulk-leaf water potential (Ψ), and stomatal conductance (SC) were investigated in eight early-maturity and seven medium-maturity maize (Zea mays L.) lines grown under drought conditions in the field. Data were collected in two samplings, 1 wk apart, during flowering. From the first to the second sampling, L-ABA and X-ABA increased 34,4 and 71.5%, respectively, Ψ declined 10.5%, whereas SC did not change appreciably. Significant differences (P < 0.05) among lines were found at both samplings for L-ABA (from 229 to 1025 ng ABA g −1 dry wt.), Ψ, and SC. Significant differences (P < 0.05) for L-ABA (from 10.1 to 41.1 nmol ABA L −1 ) were present only among medium-maturity lines at the first sampling [...]



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