Nuclear Phenomena in the Basidium of Ceratobasidium Praticolum (kotila) Olive'
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چکیده
The nuclear phenomena in the basidiuni of Ceratobnsidia~~n pralicoll~tn (Pellicz~laria praticola), studied by the Giemsa technique, are described and illustrated with photographs. The cells of the vegetative hyphae are multinucleate and those of the hymenia bi,n~~cleate. Before fusion the two nuclei in the young basiclium become closely adjacent, and their chromosomes are differentiated as elongated threads in two distinct groups. After the association of the knryolymph of the two rluclei, the chromosomes come into contact and pair. .l'he diploid nucleus then undergoes meiosis. The h;~ploid chrornosorne number is about sis, with sis bivalents present a t the hrst meiotic (disjunctional) division. Apparent chromatid bridges were observed a t anaphase I. The second meiotic division is equational. The spindle asis during both these divisions may be longitudinal, transverse, or oblique. The mature basidium has fo~lr nuclei which migrate through sterigmata into the basidiospores. Most of the basidiospores are uninucleate when young, but become binucleate a t maturity. 'I'he basidiospore germinates by repetition or directly by a germ tube. In either case coenocytic growth is produced which, upon further development, is divided into multin~~cleate hyphal cells by the formation of cross septa.
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تاریخ انتشار 2007