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THE SECRETORY SYSTEM OF THE STIGMA OF OENOTHERA ORGANENSIS MUNZ: SOME DEVELOPMENTAL AND QUANTITATIVE FEATURES

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The four-lobed stigma of Oenothera organensis Munz bears at maturity a copious surface secretion, the exclusive product of the papillate epidermal cells. The secretion is an emulsion, with 68–75% lipid forming a continuous phase and a disperse phase in the form of aqueous polysaccharide-containing globules. The latter are rich in pectins, and also contain a conspicuous particulate or granular calcofluor white-staining component, which apparently condenses from the contents of the aqueous globules after their release from the secretory cells. The secretion, which shows esterase activity, contains glucose and sucrose and a minor cytochemically-detectable protein fraction. The behaviour of the secretory cells has been followed over the final 7–10 days of stigma development. The sequence is as follows: (a) an interval of limited protein secretion, grading into (b) a period of lipid secretion when the cuticle is finally disrupted and dispersed, passing in turn into (c) an interval in which the polysaccharide-containing globules are released rapidly into the lipid from the outer faces of the cells to form the final emulsion. The average emission rate attained for the secretion as a whole is estimated at 1.09 X 102 μm3 h−1 per surface cell averaged over a 6-day period.

Affiliations: 1: Cell Physiology Laboratory, Welsh Plant Breeding Station

10.1080/0021213X.1985.10677021
/content/journals/10.1080/0021213x.1985.10677021
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/content/journals/10.1080/0021213x.1985.10677021
1985-05-13
2018-09-23

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