Results 181 to 190 of about 4,944 (225)

A PRIMITIVE SPOROPHYTE IN MAIZE

American Journal of Botany, 1924
The production of seeds is a fundamental characteristic of the spermatophytes. In many angiosperms that have been studied, one of the male gametes fuses with the primary endosperm nucleus to form the endosperm nucleus; the other male gamete fuses with the egg to form the oospore. The endosperm nucleus divides rapidly and the cell containing it develops
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Reproduction and the origin of the sporophyte

2010
Perspective: the plant life cycle Reproduction in higher plants is relatively complex, involving a life cycle consisting of two phases, a diploid sporophyte phase and a haploid gametophyte phase, comprising what is called an alternation of generations .
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The Sporophyte of Mnium hymenophyllum

The Bryologist, 1957
M6NKEMEYER, W. 1927. Die Laubmoose Europas. In Rabenhorst, Kryptogamen-Flora von Deutschland, Osterreich und der Schweiz. IV. Band, Ergiinzungsband. Leipzig. ROTH, G. 1899. Uebersicht iiber die Familie der Hypnaceen. Hedwigia 38(Beibl.) : (3)-(8). SCHIMPER, W. P. 1876. Synopsis Muscorum Europaeorum . . . Ed. 2. 2 vols. Stuttgart. SULLIVANT, W. S. 1856.
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The Sporophyte Anatomy of Dicranolejeunea axillaris

The Bryologist, 1969
Previous descriptions of Dicranolejeunea axillaris (Nees & Mont.) Schiffn. lack details of the sporophyte anatomy and shoot-sporophyte relationship. A study of serial sections shows that the sporophyte develops entirely within the enlarged calyptra and does not penetrate the gametophyte axis.
Raymond E. Stotler, Barbara J. Crandall
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Anatomy and development of the fern sporophyte

The Botanical Review, 1995
Recent research on the developmental anatomy and morphology of the fern sporophyte is reviewed. Detailed histological and experimental studies of the organization of the fern shoot apical meristem have reconfirmed the recently controversial role of the shoot apical cell as the single apical initial of the meristem.
Richard A. White, Melvin D. Turner
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Morphology of Sporophyte of Marchantia domingensis

Botanical Gazette, 1929
1. At the time of fertilization of Marchantia domingensis both egg and sperm nucleoli are very conspicuous. Chromatin-like material surrounds the nucleolus of the egg, while granular strands usually project from the sperm. 2. The time of the appearance of the first wall varies. 3.
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Morphology of the Sporophyte of Riccia crystallina

Botanical Gazette, 1932
1. As soon as fertilization is accomplished in Riccia crystallina, the young embryo enlarges considerably and a thin wall is formed. The cells of the venter also enlarge, divide, and a two-layered calyptra develops. 2. The first division of the zygote is either transverse or inclined to the major axis of the archegonium.
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Sporophytic Self-Incompatibility

1992
The anemogamic or entomogamic pollination processes passively sustained by land plants and the wide occurence of hermaphrodism among most plant families, convergerge to favor a natural propensity for self-pollination, inbreeding and homozigosity. In fact, many plants species are known to be able to identify and to reject their own pollen.
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Sporophytic and Gametophytic Self-Incompatibility

1992
In this article the main features of the best-studied self- incompatibility (SI) systems will be summarized (see also Nasrallah and Nasrallah 1989, and Harings et al. 1991), followed by a more detailed description of potato pistil proteins and their possible role in SI.
H. Kaufmann, H. Kirch, T. Wemmer, A. Peil, F. Lottspeich, H. Uhrig, F. Salamini, R. Thompson   +7 more
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Development of Sporophyte of Marchantia chenopoda

Botanical Gazette, 1929
1. The first transverse division of the zygote in Marchantia chenopoda separates the foot from the seta and capsule, that is, the foot develops from the hypobasal cell, the seta and capsule from the epibasal cell. 2. Two primary transverse divisions seem to be the regular occurrence in the embryo, instead of a quadrant division. These divide the embryo
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