Heslop-Harrison, Y. ; Heslop-Harrison, J. ; Shivanna, K. R. (1981) Heterostyly in Primula. 1. Fine-structural and cytochemical features of the stigma and style in Primula vulgaris huds Protoplasma, 107 (1-2). pp. 171-187. ISSN 0033-183X
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Official URL: http://www.springerlink.com/content/jjg562600726j8...
Related URL: http://dx.doi.org/10.1007/BF01275616
The stigmas of the heterostylous genus Primula are of the "dry" type without a free-flowing surface secretion. The papillae of the stigma surface cells of the two morphs, in pin (stigma exserted) and thrum (stamens exserted), bear a thin proteinaceous surface pellicle, overlying a discontinuous cuticle. The vacuoles of the papillate cells contain tannins, and tannin cells extend in files through the stigma heads and form a loose sheath surrounding the pollen-tube transmitting tract in the styles. The cells of the transmitting tissue in the stigma heads have a normal complement of organelles, and abundant ribosomal endoplasmic reticulum. The intercellular spaces contain an internal secretion which reacts cytochemically for both carbohydrate and protein. The transmitting tract in the styles forms a central core surrounded by several vascular strands. The cells are elongated, and the intercellular spaces here also have a carbohydrate-protein content. In a compatible pollination, thrum pollen tubes enter the stigma by penetrating the cuticle at the tip or on the flank of the pin papilla. Pin tubes on the thrum stigma enter between adjacent papillae, penetrating the thin cuticle at the base. The tubes grow through the transmitting tracts in the intercellular material.
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|Keywords:||Breeding System; Heterostyly; Pollen-stigma Interaction; Pollen Tube Growth; Primula; Self-incompatibility|
|Deposited On:||19 Jul 2011 12:49|
|Last Modified:||19 Jul 2011 12:49|
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