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Plant and Cell Physiology, 1999, Vol. 40, No. 5 542-548
© 1999

A Crucial Role for Gibberellins in Stress Protection of Plants

Nataraj N. Vettakkorumakankav1, Duane Falk2, Praveen Saxena2 and R. Austin Fletcher1,3

1 Departments of Environmental Biology, University of Guelph Guelph, Ontario NIG 2W1, Canada
2 Plant Agriculture, University of Guelph Guelph, Ontario N1G 2W1, Canada

3FAX, +519-837-0442; e-mail, afletch{at}evbhort.uoguelph.ca

The hypothesis that there is an intimate relationship between gibberellin levels and plant stress protection has been tested using near-isogenic lines of a normal and dwarf barley (Hordeum vulgare L.). Application of paclobutrazol (a triazole), induced stress protection in the normal line and application of GA3 to the dwarf reversed the inherent stress tolerance. Reversal of the dwarf phenotype by specific gibberellins (GAs) suggests that the conversion of GA20 to GA1 and GA9 to GA4 has been compromised. These observations indicate that modulation of specific GAs plays a key role in stress protection. The preferential use of non-chemical technologies including enzyme regulation, phytochrome A overexpression, and breeding for induction of stress tolerance in plants are discussed.

(Received November 26, 1998; Accepted March 11, 1999)
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