Results 121 to 130 of about 455 (164)

Aposporie et sexualité chez les mousses. III

, 1907
Marchal, Elie, Marchal, Émile
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Induced Apospory in Polypodiaceous Ferns

Nature, 1958
THE induction of outgrowths of gametophytic tissue from the sporophyte in mosses has been accomplished many times since Pringsheim1 first reported it. In the ferns, the aposporous production of fully sexual gametophytes from genetically normal sporophytes has been considered to occur less readily. Although various forms of apospory in a number of ferns
P R Bell
exaly   +2 more sources

Apospory and parthenogenesis may be uncoupled in Poa pratensis: a cytological investigation

Sexual Plant Reproduction, 2001
Despite the potential that apomixis has for agriculture, there is little information regarding the genetic control of its functional components. We carried out a cytohistological investigation on an F1 segregating population of Poa pratensis obtained from a cross between a sexual and an apomictic parent.
Emidio Albertini, Andrea Porceddu, F Ferranti   +2 more
exaly   +4 more sources

Inheritance of Apospory in Buffelgrass

Crop Science, 1994
Previous studies on inheritance of monopolar (Panicum type) apospory in the Panicoideae resulted in three widely different genetic models and mutually incompatible data sets. We report additional data for tetraploid buffelgrass [Pennisetum ciliate (L.) Link = Cenchrus ciliaris L.] and attempt to reconcile earlier studies.
R. T. Sherwood, C. C. Berg, B. A. Young
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Ultrastructural characterization of apospory in Panicum maximum

Sexual Plant Reproduction, 1995
The nucellar ultrastructure of apomictic Panicum maximum was analyzed during the meiocytic stage and during aposporous embryo sac formation. At pachytene the megameiocyte shows a random cell organelle distribution and sometimes only an incomplete micropylar callose wall. The chalazal nucellar cells are meristematic until the tetrad stage. They can turn
Naumova, T.N., Willemse, M.T.M.
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Apogamy, apospory, and parthenogenesis in the Pteridophytes

The Botanical Review, 1939
There can be no doubt that the plants most favorable for the study of apogamy and apospory are the homosporous leptosporangiate Filicales, in many of which these deviations in life cycles have been found to occur in nature and also under cultural conditions. They are not, however, at present fully understood.
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Apospory in Sorghum bicolor (L.) Moench

Science, 1970
A line of Sorghum bicolor (L.) Moench was discovered to reproduce by apospory, a type of apomixis. The formation of an embryo by a nucellar cell without fertilization was established by cytological observations of ovaries and by progeny tests.
W W, Hanna, K F, Schertz, E C, Bashaw
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Apospory‐Linked Molecular Markers in Buffelgrass

Crop Science, 1997
Isolation of a gene controlling apomixis would be useful to plant breeders for fixing hybrid vigor. A single gene encodes for aposporous apomixis in buffelgrass (Pennisetum ciliare L. Link), which is inherited in a autotetraploid fashion. Only two molecular markers linked to the gene are known: C04‐600, a RAPD (random amplified polymorphic DNA) and ...
D. L. Gustine, R. T. Sherwood, D. R. Huff   +2 more
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Apospory in Paspalum thunbergii

Australian Journal of Botany, 2004
The cytology, development of aposporous embryo sac, pro-embryo and pseudogamy in Paspalum thunbergii Kunth ex Steud. was studied. P. thunbergii was found to be a tetraploid cytotype, with a chromosome number of 40. Meiosis of the pollen mother cells was irregular, pollen viability was low and multiporate pollens were often observed.
Guohua Ma, Xuelin Huang, Nanxian Zhao, Qiusheng Xu   +3 more
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INDUCED APOSPORY IN THE LIVERWORT BLASIA PUSILLA

American Journal of Botany, 1968
Immature sporophytes of Blasia pusilla L. collected in the field were excised from the protective gametophytic tissues and cultured on a slightly modified Knop's agar substrate in microphytotrons.
Livija Raudzens, Edwin B. Matzke
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