Summary
The aim of the present study has been to elucidate the cytology of the glandular stigma inLycopersicum peruvianum Mill. and the mechanism of the secretory process during the stigma development.
The glandular stigma (papillae and superficial stigmatic tissue) has been studied by light and electron microscopy (S.E.M. and T.E.M.).
At anthesis, the longitudinal intercellular spaces are filled with exudate in the form of heterogeneous droplets and form an intercommunicating system which allows transmitting tissue to communicate with superficial papillae.
The presence of cytoplasmic droplets similar in appearance to the exudate has been noted in the developing stigmatic tissue. Cytoplasmic events which may be related to their production include transitory vacuolar accumulations, modifications of the morphology of plastids and development of smooth endoplasmic reticulum. At anthesis, observations possibly related to the origin of these droplets include their contiguity with endoplasmic reticulum cisternae and their relationship to the Golgi apparatus.
Some observations suggest that cytoplasmic droplets are extruded by a process of exocytotic secretion. In addition, the cytoplasmic transport of secretory products in a non-visible form may explain the involvement of several cell compartments and the heterogeneity of the secretory products.
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Research partially supported by C.N.R.S. “R.C.P. 429” and by C.N.R. programme “Biology of reproduction”.
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Dumas, C., Rougier, M., Zandonella, P. et al. The secretory stigma inLycopersicum peruvianum Mill.: Ontogenesis and glandular activity. Protoplasma 96, 173–187 (1978). https://doi.org/10.1007/BF01279584
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DOI: https://doi.org/10.1007/BF01279584