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Annals of Botany 85 (Supplement A): 59-68, 2000
© 2000 Annals of Botany Company

Signalling Pathways in Pollen Tube Growth and Reorientation

Rui Malhó 1, Luísa Camacho 1, and Ana Moutinho 1

1 Departamento de Biologia Vegetal, Faculdade de Ciências de Lisboa, Bloco C2, 1749-016 Lisboa, Portugal

Fax +351 21 7500048, r.malho{at}fc.ul.pt

Plant fertilization is an essential process for seed production. One of the most interesting and important aspects is pollen tube growth from the stigma to the ovary. Understanding of the guidance mechanisms involved has been much debated, and important insights into the biochemical and physiological aspects of these events have been reported recently. Yet, the specific morphogenetic mechanisms which provide the pollen tube with these attributes remain very much unknown. In experimental terms, a substantial amount of research has dealt with the identification of cellular messengers, their capacity to generate a signal and how the information is coded in that signal. The role of cytosolic free calcium ([Ca2+]c) has received a great deal of attention but research is extending rapidly to other areas.

Calcium gradient, oscillations, pollen tube guidance, second messengers

Submitted on July 21, 1999
Revised on August 25, 1999
Accepted on September 14, 1999


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