MICROSPOROGENESIS AND THE MALE GAMETOPHYTE AT SOME TAXACEAE FAMILY TAXA
Journal Title: Analele Stiintifice ale Universitatii Alexandru Ioan Cuza din Iasi, Serie noua, Sectiunea II a. Biologie vegetala - Year 2009, Vol 55, Issue 1
Abstract
In this paper we point out the microsporogenesis and male gametophyte at some representatives of the Taxaceae family, Taxus L. and Torreya Arn. Both of them are dioecious plants. In Romania Taxus is cultivated and spontaneous while Torreya is only cultivated. The male cones are usually herbaceous and much less conspicuous even at full maturity. The male cones (microstrobilus cones or pollen cones) of cultivated Taxus baccata L. are 2-5 mm long, globose. From a central axis 6-12 peltate microsporophylls are radially extending out. Under each microsporophyll 6-8 microsporangia (pollen sacs) are attached on the adaxial, inner side. The male cones shed pollen in the early spring (March and April), that is carried on the wind to the female cone. Male cones of Torreya species (T. californica Torr., T. nucifera (L.) Sieb. et Zucc., and T. taxifolia Arnott) are ovoid or oblong, bigger than those of Taxus cones but have a similar structure. We emphasize the sporogenous tissue, the sporogenous cells, another wall structure, tetrads, the released young microspores from tetrads, and non-saccate pollen. SEM examination of the pollen point out the verrucose outer part of the exine of the pollen of Taxus baccata L., Torreya californica Torr., Torreya nucifera (L.) Sieb. et Zucc., and Torreya taxifolia Arnott.
Authors and Affiliations
GENŢIANA PREDAN, ANGELA TONIUC
Keywords
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