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Pollen wall development in flowering plants
Author(s) -
Blackmore Stephen,
Wortley Alexandra H.,
Skvarla John J.,
Rowley John R.
Publication year - 2007
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2007.02060.x
Subject(s) - pollen , microspore , tetrad , biology , palynology , botany , meiosis , ultrastructure , ontogeny , developmental stage , evolutionary biology , cell wall , stamen , gene , genetics , psychology , developmental psychology
Summary The outer pollen wall, or exine, is more structurally complex than any other plant cell wall, comprising several distinct layers, each with its own organizational pattern. Since elucidation of the basic events of pollen wall ontogeny using electron microscopy in the 1970s, knowledge of their developmental genetics has increased enormously. However, self‐assembly processes that are not under direct genetic control also play an important role in pollen wall patterning. This review integrates ultrastructural and developmental findings with recent models for self‐assembly in an attempt to understand the origins of the morphological complexity and diversity that underpin the science of palynology.ContentsSummary 483 I. Introduction 483 II. Progress of research on pollen wall development 485 III. The developmental role of the special cell wall 487 IV. Meiosis and the establishment of microspore symmetry 489 V. The origins of the exine during the tetrad stage 490 VI. The free microspore stage to pollen maturation 495 VII. Conclusions 495Acknowledgements 496References 496