A Crucial Role for Gibberellins in Stress Protection of Plants |
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| Authors: | Vettakkorumakankav Nataraj N; Falk Duane; Saxena Praveen; Fletcher R Austin |
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| Institution: | 1 Departments of Environmental Biology, University of Guelph Guelph, Ontario NIG 2W1, Canada
2 Plant Agriculture, University of Guelph Guelph, Ontario N1G 2W1, Canada |
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| Abstract: | The hypothesis that there is an intimate relationship betweengibberellin levels and plant stress protection has been testedusing near-isogenic lines of a normal and dwarf barley (Hordeumvulgare L.). Application of paclobutrazol (a triazole), inducedstress protection in the normal line and application of GA3to the dwarf reversed the inherent stress tolerance. Reversalof the dwarf phenotype by specific gibberellins (GAs) suggeststhat the conversion of GA20 to GA1 and GA9 to GA4 has been compromised.These observations indicate that modulation of specific GAsplays a key role in stress protection. The preferential useof non-chemical technologies including enzyme regulation, phytochromeA overexpression, and breeding for induction of stress tolerancein plants are discussed. (Received November 26, 1998; Accepted March 11, 1999) |
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