Plant Physiol. Drug Metab Dispos
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Plant Physiology 76:326-330 (1984)
© 1984 American Society of Plant Biologists

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Articles

Gibberellin A4/7 and the Promotion of Flowering in Pinus radiata1

Effects on Partitioning of Photoassimilate within the Bud during Primordia Diferentiation

Stephen D. Ross, Mark P. Bollmann2, Richard P. Pharis and Geoffrey B. Sweet2

Western Forestry Research Center, Weyerheuser Co., 505 North Pearl Street, Centralia, Washington 98531, Forest Research Institute, Private Bag, Rotorua, New Zealand, Biology Department, University of Calgary, Calgary, Alberta T2N 1N4 Canada

Gibberellin A4/7 mixture (GA4/7), a highly effective promoter of early and enhanced flowering in the Pinaceae, caused a significant reallocation of dry matter and 14C-photosynthate within terminal buds of Pinus radiata D. Don within 8 days of hormone treatment. Treatment with GA4/7 to terminal shoots of vigorous, potentially flowering mature grafted propagules reduced the flow of photoassimilated 14C and dry matter into the terminal bud as a whole, but significantly increased the dry matter and 14C allocated within the bud to developing long-shoot primordia (potential seed-cone buds). This was accomplished at the expense of the structural tissues, the apical dome region, and the vegetative branch buds. Although GA3 caused a similar reallocation of dry matter within the terminal bud, it was significantly less effective than GA4/7 thus appears to have, in addition to any nutrient diversion abilities, a distinct morphogenic function in sexual differentiation.

2 Present address: Research Branch, British Columbia Ministry of Forests, 1450 Government Street, Victoria, B.C. V8W 3E7 Canada.

1 Supported in part by a Killam Resident Fellowship (U. Calgary) to R. P. Pharis and by Natural Sciences and Engineering Research Council Grant A-2585 to R. P. Pharis and GO-633 to R. P. Pharis and J. N. Owens. S. D. Ross' involvement in this research was made possible through a scientist exchange program between the Weyerheuser Co., U.S.A., and the Forest Research Institute of the New Zealand Forest Service.






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Copyright © 1984 by the American Society of Plant Biologists