Morpho-physiological studies in field-grown maize genotypes selected for abscisic acid content
2003
Ljubojevic, L. (University of Belgrade, Belgrade - Zemun (Serbia and Montenegro). Faculty of Agriculture) | Pekic, S. | Stikic, R. | Jovanovic, Z. | Prokic, Lj. | Quarrie, S.A.
Selection program to produce closely related genotypes varying in the leaf content of plant hormone abscisic acid (ABA) was done with maize to test morpho-physiological consequences of this genetic modification. The cross was done between two maize lines Polj-17 and F-2 that have previously been shown to differ by up to three-fold in leaf abscisic acid concentration in the field. The progeny was classified into high ABA (H) and low ABA (L) lines according to leaf ABA contents of individual plants in the F4 generation. The lines were studied in the field with the aim to characterize the differences amongst the lines in some morpho-physiological traits (leaf ABA and xylem ABA contents, stomatal conductance, water potential, plant height and leaf number) and yield. Data analysis done by ANOVA program has shown statistically significant differences between two classes of lines in leaf and xylem ABA contents, plant height and number of leaves. Obtained results also showed that high-ABA lines out yielded low-ABA lines. Differences between the ABA lines in both, leaf ABA content and xylem ABA content were unlikely to be due to differences in leaf water status. Therefore, other possible explanations for the genotypic differences and their consequences on yield are discussed.
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