Pollinator preferences and relative fitness of Nicotiana alata, N. forgetiana and their F1 hybrids
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منابع مشابه
Pollinator preferences for Nicotiana alata, N. forgetiana, and their F1 hybrids.
The role of pollinators in plant speciation and maintenance of species boundaries is dubious because most plant species are visited by several types of pollinators, and most pollinator species visit several species of plants. We investigated pollinator preferences and their efficacy as ethological isolation mechanisms between two interfertile species, Nicotiana alata and N. forgetiana and their...
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ENETIC tumors in Nicotiana species hybrids have been reported by several Ginvestigators. These tumors are formed in certain specific hybrid combinations on stems, roots, and occasionally on leaves of all or part of the F, progeny. Since the discovery by KOSTOFF (1930) of nine interspecific tumorous hybrids, almost 20 additional hybrid combinations have been reported in which the entire progeny ...
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A new genetic interpretation of self-sterility as manifested in Sicotiana alata Lk. and Otto var. grandijiora Comes and Sicotiana forgetiana Hort. (Sand.), or their hybrids, has been proposed recently (EAST and M ~ N G E L S DORF 192.5). The detailed evidence on which this interpretation rests i< given in the present paper. Self-sterility appears to behave as a simple recessive when the,e speci...
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Although S-locus RNases (S-RNases) determine the specificity of pollen rejection in self-incompatible (SI) solanaceous plants, they alone are not sufficient to cause S-allele-specific pollen rejection. To identify non-S-RNase sequences that are required for pollen rejection, a Nicotiana alata cDNA library was screened by differential hybridization. One clone, designated HT, hybridized strongly ...
متن کاملPollination in Nicotiana alata stimulates synthesis and transfer to the stigmatic surface of NaStEP, a vacuolar Kunitz proteinase inhibitor homologue
After landing on a wet stigma, pollen grains hydrate and germination generally occurs. However, there is no certainty of the pollen tube growth through the style to reach the ovary. The pistil is a gatekeeper that evolved in many species to recognize and reject the self-pollen, avoiding endogamy and encouraging cross-pollination. However, recognition is a complex process, and specific factors a...
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