Karyotype and mechanism of sex determination in Ephedra foliata Boiss. - A dioecious gymnosperm.
نویسندگان
چکیده
منابع مشابه
Karyotype and Sex Expression in Coccinia indica, a Dioecious Cucurbit
Cytological and immunochemical studies were carried out on dioecious Coccinia indica to understand the genetic control of sex expression. The somatic chromosome number of both the sex forms of C. indica was found to be 2n = 24 and the karyotype shows high homogeneity, though a distinct heteromorphic pair of sex chromosomes is found in male sex forms of C. Indica. Soluble protein profile from th...
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Angiosperm species that produce unisexual flowers present the opportunity for separate analysis of the male and female programs for floral differentiation and gametogenesis. A vast literature describes the genetic and physiological basis of sex determination in these species. (For reviews, see Westergaard, 1958; Grant, 1975; Frankel and Galun, 1977; Durand and Durand, 1984.) Recently, it has be...
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Most gymnosperms are wind-pollinated, but some are insect-pollinated, and in Ephedra (Gnetales), both wind pollination and insect pollination occur. Little is, however, known about mechanisms and evolution of pollination syndromes in gymnosperms. Based on four seasons of field studies, we show an unexpected correlation between pollination and the phases of the moon in one of our studied species...
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Angiosperms are the most diverse group of land plants which provides fruits, food, seed for cultivation and material for hybridization purpose etc. Approximately 90% of all angiosperm species have hermaphrodite (bisexual) flowers and the remaining, onetenth are either monoecious (male and female flowers are separate but grow in same plant) or dioecious (male and female flower grow on different ...
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reinsurance is widely recognized as an important instrument in the capital management of an insurance company as well as its risk management tool. this thesis is intended to determine premium rates for different types of reinsurance policies. also, given the fact that the reinsurance coverage of every company depends upon its reserves, so different types of reserves and the method of their calc...
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ژورنال
عنوان ژورنال: CYTOLOGIA
سال: 1981
ISSN: 0011-4545,1348-7019
DOI: 10.1508/cytologia.46.173