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Abscisic Acid Concentration in Leaf and Xylem Sap, Leaf Water Potential, and Stomatal Conductance in Maize

Dipartimento di Agronomia, University of Bologna, Via Filippo Re 6-8, 40126 Bologna, Italy

^* Corresponding author (tz4bot61{at}cine88.cineca.it).

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 (), and stomatal conductance 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, 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.), , and SC. Significant differences (P < 0.05) for X-ABA (from 10.3 to 41.1 nmol ABA L^–1) were present only among mediummaturity lines at the first sampling. Correlation coefficients computed on a single-plot and variety-mean basis (r_p and r_v, respectively) were generally similar. L-ABA and X-ABA were positively correlated. On a variety-mean basis, SC was more strongly correlated with X-ABA than with L-ABA at the first and second samplings (r_v of – 0.60* vs. –0.40 and –0.71** vs. –0.19, respectively). The association between and SC changed markedly from the first to the second sampling (r_p from –0.46** to 0.66**; r_v from –0.37 to 0.31). An analogous trend was found for the correlations computed on a single-plant basis within each line: all of the 13 lines characterized by negative correlations in the first sampling showed positive coefficients 1 wk later. The negative relationship between and SC at the first sampling suggests that SC was controlling .

Received for publication December 1, 1993.

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