Results 151 to 160 of about 48,184 (186)

Mechanisms of Microspore Embryogenesis

1992
As Haldane stated in 1937 “Every species is at the mercy of its pollen grains”, and although this motto is undoubtedly true in evolutionary terms, it is only relatively recently that we have been able to disrupt at will this critical phase of plant development.
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Microspore Derived Embryogenesis

1992
The period of cellular development that encompasses meiosis and microsporogenesis is of key scientific and commercial interest, but the complex cytological organisation of the anther and the rapid pace of differentiation has made it difficult to investigate by standard molecular methodology.
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Scanning electron microscopy of microspore embryogenesis inBrassica spp.

Plant Cell Reports, 1997
Scanning electron microscopy was employed to study and compare microspore embryogenesis in vitro with pollen development in planta inBrassica napus andB. oleracea. An exine with its specific pattern had already been formed, when microspores were released from tetrads.
T, Nitta, Y, Takahata, N, Kaizuma
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Wheat microspore embryogenesis during in vitro anther culture

Theoretical and Applied Genetics, 1984
Cytological analysis of microspore embryogenesis during in vitro culture reveals a high mortality in the first week and a latency phase of about one week before the first embryogénic mitosis. Genotypic differences observed during our wheat anther culture do not seem to originate at the induction level but are linked to the different abortion rates.
Y, Henry, J, De Buyser, T, Guenegou, C, Ory   +3 more
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Embryogenesis in microspore culture of Vitis subspecies

2015
VITIS - Journal of Grapevine Research, Vol. 36 No.
Sefc, Kristina M., Ruckenbauer, P., Regner, F.   +2 more
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Defined Nuclear Changes Accompany the Reprogramming of the Microspore to Embryogenesis

Journal of Structural Biology, 2000
The switch of the gametophytic developmental program toward pollen embryogenesis to form a haploid plant represents an important alternative for plant breeding. In the present study, the switch of the gametophytic developmental program toward a sporophytic pathway, "embryogenesis," has been studied in three different plant species, Brassica, tobacco ...
Testillano, Pilar S., Coronado, María José, Seguı́, J. M., Domenech, Jezabel, González-Melendi, Pablo, Raska, Ivan, Risueño, María Carmen   +6 more
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REGULATION OF THE INDUCTIVE PHASE OF MICROSPORE EMBRYOGENESIS IN BRASSICA NAPUS

Acta Horticulturae, 1996
In cultured microspores from Brassica napus, embryogenesis can be synchronously and irreversibly induced by elevating the culture temperature to 32°C for a minimum of 8 h. Culture at 18°C allows gametophytic development to continue, and results in the formation of pollen in vitro.
Custers, J.B.M., Cordewener, J.H.G., Dons, H.J.M., van Lookeren Campagne, M.M.   +3 more
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Influence of ethylene in microspore embryogenesis

1996
Ethylene (C2H4) is the simplest olefin and exists in the gaseous state under normal physiological conditions; it regulates many aspects of plant growth, development and senescence and its effects are commercially important (Yang and Hoffman, 1984). Some of the physiological processes influenced by ethylene are release of seed, bud dormancy, seedling ...
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Programmed Cell Death and Microspore Embryogenesis

2008
Programmed cell death (PCD) occurs in the anther during in vivo micro-spore/pollen development. The first hallmarks are detected in the tapetum at meiosis and consist in progressive degeneration of organelles such as mitochondria, as well as DNA degradation into multiple of 180 kpb fragments.
A. L. Varnier, C. Jacquard, C. Clément
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Evidence for microspore embryogenesis in wheat anther culture

In Vitro Cellular & Developmental Biology - Plant, 1991
In wheat, plants may be regenerated from microspores via direct embryogenesis or organogenesis or embryogenesis from callus. Light and scanning electron microscopy were used to carefully study morphogenesis of microspore-derived plants from anther culture on modified 85D12 starch medium and to determine whether the plants were formed via organogenesis ...
J. J. Rybczynski, R. L. Simonson, P. S. Baenziger   +2 more
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