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Journal of Experimental Botany, Vol. 54, No. 380, pp. 47-54, January 1, 2003
© 2003 Oxford University Press

Adhesion and guidance in compatible pollination

Received 12 April 2002; Accepted 30 August 2002

E. M. Lord1,

Department of Botany and Plant Sciences, University of California Riverside, Riverside, CA 92521-0124, USA

1 To whom correspondence should be addressed. E-mail: LORD{at}ucracl.ucr.edu

The mechanisms of compatible pollination are less studied than those of incompatible pollination and yet most of the angiosperms show self-compatibility. From the release of pollen from anthers to the penetration of the micropyle by the pollen tube tip, there are numerous steps where the interaction between pollen and the pistil can be regulated. Recent studies have documented some diverse ways in which pollen tubes carrying sperm cells are guided to the ovules through the pistil extracellular matrices of the transmitting tract. What is still missing is an understanding of pollen tube cell biology in vivo. A recent finding supports the role of the synergids in the crucial guidance cue for the pollen tube tip at the micropyle, but experimental evidence for other ‘guidepost’ cells in the pistil is still lacking. The fact that the pollen tube must first travel through the matrices of the stigma and style before it can respond to the cue from the ovule makes it likely that there is a hierarchy of signalling events in pollen–pistil interactions starting at the stigma and ending at the micropyle. On the pistil side, several model systems have been used in the discovery of molecules implicated in either physical or chemical guidance. In lily, which has a hollow style, adhesion molecules (pectin and SCA) are implicated in guidance. SCA alone is also capable of inducing pollen chemotropism in an in vitro assay, suggesting that this peptide plays a dual role in lily pollination: chemotactic in the stigma and haptotactic (adhesion mediated) in the style.

Key words: Adhesion, guidance mechanisms, pollen–pistil interactions, pollen tube cells, signalling.


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