Journal of Experimental Botany, Vol 50, 1289-1297, Copyright © 1999 by Oxford University Press
M Sanguineti, R Tuberosa, P Landi, S Salvi, M Maccaferri, E Casarini and S Conti
Abscisic acid (ABA) concentration is a quantitatively inherited trait which
plays a pivotal role in the response of plants to drought stress. A recent
study identified 17 quantitative trait loci (QTLs) controlling bulk-leaf
ABA concentration (L-ABA) in a maize (Zea mays L.)
population of 80 F4 random families tested for two years under droughted
field conditions. Sixteen of the QTL regions influencing L-ABA also
harboured QTLs for one or more of the following traits: stomatal
conductance, a drought sensitivity index, leaf temperature, leaf relative
water content, anthesis-silking interval, and grain yield. The analysis of
the effects of each QTL region on the investigated traits indicated that
L-ABA mainly represented an indicator of the level of drought stress
experienced by the plant at the time of sampling because an increase in
L-ABA was most commonly associated with a decrease in both stomatal
conductance and grain yield as well as an increase in leaf temperature.
Opposite results were observed at one QTL region on chromosome 7 near the
RFLP locus asg8. A model is presented to interpret
these contrasting results in terms of pleiotropic effects.Key
words: Abscisic acid, ABA, drought stress, quantitative trait
locus (QTL), molecular markers, Zea mays.
ARTICLES
QTL analysis of drought-related traits and grain yield in relation to genetic variation for leaf abscisic acid concentration in field-grown maize
Dipartimento di Agronomia, Universitá di Bologna, via Filippo Re 6-8, 40126 Bologna, Italy; Corresponding author e-mail: tuberosa@agrsci.unibo.it
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