The role of abscisic acid and auxin in the response of poplar to abiotic stress

Plant Biology - Tập 12 Số 2 - Trang 242-258 - 2010
Jennifer Popko1, Robert Hänsch1, Ralf R. Mendel1, Andrea Polle2, Thomas Teichmann3,2
1Institut für Pflanzenbiologie, Technische Universität Braunschweig, Braunschweig, Germany
2Institut für Forstbotanik, Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Georg-August-Universität Göttingen, Göttingen, Germany
3Abteilung Zellbiologie der Pflanze, Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Georg-August-Universität Göttingen, Göttingen, Germany

Tóm tắt

AbstractThe plant hormones auxin and abscisic acid may at first sight appear to be a conflicting pair of plant regulators. Abscisic acid content increases during stress and protects plant water status. The content of free auxin in the developing xylem of poplar declines during stress, while auxin conjugates increase. This indicates that specific down‐regulation of a signal transduction chain is important in plant adaptation to stress. Diminished auxin content may be a factor that adapts growth and wood development of poplar during adverse environmental conditions. To allow integration of environmental signals, abscisic acid and auxin must interact. Data are accumulating that abscisic acid–auxin cross‐talk exists in plants. However, knowledge of the role of plant hormones in the response of trees to stress is scarce. Our data show that differences in the localisation of ABA synthesis exist between the annual, herbaceous plant Arabidopsis and the perennial woody species, poplar.

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