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The Role of Plant Growth Regulators in the Development and Germination of Conifer Pollen

  • Chapter
Hormonal Control of Tree Growth

Part of the book series: Forestry Sciences ((FOSC,volume 28))

  • 133 Accesses

Abstract

All classes of PGRs have been identified in pollen and at least implicated in its growth and development. When added exogenously, their effects on in vitro pollen germination and tube growth can be either neutral, promotive or inhibitory. It is generally agreed that PGRs play an important role in regulating germination and tube growth but endogenous levels appear to be sufficient and significant responses to in vitro applications are seldom observed. Specific roles of PGRs in conifer pollen have not been elucitated but certain speculations are offered. In pines, auxins derived from pollen may be important in the continued development of the ovule, since unpollinated ovules abort. However, in several other genera (Pseudotsuga for example) pollen is not required to continue ovule development. Gibberellins (GAs) may have a role in the early stages of germination and tube growth. Both polar and non-polar GAs have been isolated from conifer pollen but in germinating pollen, it is the polar GAs which rise and the non-polar GAs that decline during the time of maximum tube growth. Abscisic acid (ABA) occurs in the pollen, styles and ovaries of many angiosperm species and some conifers but it does not have any apparent role in germination or tube growth. It may, however, play an important role in regulating incompatibility reactions. Brassinolides have not been studied in any detail but their occurrence in conifer pollen has been confirmed. Cyclic-adenosine monophosphate (cAMP) may not be considered a PGR but it has been identified in conifer pollen and it does mimic the effects of other PGRs in pollen germination studies. In vitro PGR effects are discussed in relationship to media effects which can have a dramatic influence on pollen germination and tube growth and may explain the lack of a PGR response in certain cases.

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  1. Research Branch, British Columbia Ministry of Forests and Lands, 1320 Glyn Road, Victoria, B.C., V8Z 3A6, Canada

    J. E. Webber (Research Scientist)

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  1. USDA Forest Service, University of Florida, Gainesville, Florida, USA

    Susan V. Kossuth

  2. Research Branch, British Columbia Ministry of Forest and Lands, Victoria, B.C., Canada

    Steve D. Ross

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Webber, J.E. (1987). The Role of Plant Growth Regulators in the Development and Germination of Conifer Pollen. In: Kossuth, S.V., Ross, S.D. (eds) Hormonal Control of Tree Growth. Forestry Sciences, vol 28. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1793-9_10

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