Results 171 to 180 of about 744 (199)

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, B. M. RICHARDS
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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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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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The fine structure of fern root cells showing apospory

Developmental Biology, 1970
Abstract Isolated roots of the fern, Pteridium aquilinum were grown on growth-supporting medium (White's plus 5% coconut milk) and on apospory-promoting medium (Knudson's inorganic salts with or without 10−7 M kinetin). In the latter medium growth of the root ceased and diploid gametophytes were formed in 8 to 10 weeks from outer cells of the root ...
M H, Munroe, P R, Bell
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A Study of Apospory in Pteridium aquilinum

American Fern Journal, 1949
thesis on the Ferns of Quebec,7 Brother Marie-Victorin included this fern, remarking that since it occurs in Vermont almost up to the Canadian boundary, it is surely present in Quebec also. Although this was doubted by others, the fern was later discovered near Bedford, in Quebec a few miles north of the Vermont border, as reported by Mousley.8 In ...
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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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Parthenogenesis, apogamy and apospory in Alaria crassifolia (Laminariales)

Marine Biology, 1973
In cultures of Alaria crassifolia Kjellman, unfertilized eggs developed normally into haploid sporophytes which differentiated into a holdfast, stipe and blade with a midrib. The terminal cells of a male gametophyte grew apogamously into haploid sporophytes with narrow blades which lack the midrib.
H. Nakahara, Y. Nakamura
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Laboratory-Induced Apogamy and Apospory in Ceratopteris richardii

2010
All land plants progress through a life cycle that alternates between two multicellular generations, the haploid gametophyte and the diploid sporophyte. The lifespan and autotrophy of the two generations have evolved from bryophytes to seed plants in opposite directions: the sporophyte generation became long-lived and autotrophic whereas the ...
Angela R. Cordle, Linh Thuy Bui, Erin E. Irish, Chi-Lien Cheng   +3 more
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