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Aposporous Embryo Sacs in Sexual Plants Aposporous embryo sacs, embryo
sac-like structures, or initials have repeatedly been reported to occur in sexual
species.4 However, caution is indicated, according to Nogler,63 in interpreting ...
Sven Asker, Lenn Jerling, 1992
2
Genetic control of self-incompatibility and reproductive ...
Unlike the sexual, megasporocyte which undergoes meiotic reduction, the
aposporous initials form unreduced embryo sacs by mitotic processes. The
mechanisms which allow the differentiation of additional cells programmed to
form embryo ...
Elizabeth G. Williams, A.E. Clarke, R.B. Knox, 1994
3
The Flowering of Apomixis: From Mechanisms to Genetic ...
The degeneration of meiotically derived megaspores and early stages of
aposporous initiation has recently been investigated in Brachiaria brizantha. In
this grass, aposporous initials appear to contain dedifferentiated organelles
reminiscent ...
Yves Savidan, John G. Carman, Thomas Dresselhaus, 2001
Table 10.3 Some examples of the genetic control of agamospermy (after Asker,
1980) Sorbus A genomes for S. aria (Whitebeam), B genomes from (aposporous)
S. aucuparia (Rowan). A genomes apparently influence apospory in polyploids, ...
5
Plant Biotechnology and Agriculture: Prospects for the 21st ...
The signals that control degeneration of meiotic products in aposporous apomicts
are not known. It is possible that timing of aposporous initial specification, growth
rate, and competition for space with the functional megaspore are key ...
A. Altman, Paul M. Hasegawa, 2012
triploids from sexual, diploid mothers. In the aposporous subgenus Hieracium
Pilosella, hybridization is common between sexual and apomictic species, and
complex population structures with varying ploidy states exist (Fehrer et al., 2007)
.
Numerous cells can enlarge and immediately begin the mitotic events of
aposporous embryo sac formation. The cells initiating apospory, like those
undergoing megagametogenesis in sexual plants, lack callose in their walls (
Peel et al., 1997; ...
Sharman D. O'Neill, Jeremy A. Roberts, 2002
8
Apomixis: Exploiting Hybrid Vigor in Rice
These aposporous cells enlarge, become vacuolated and their nuclei divide
mitotically to produce sacs usually with one to five nuclei. The number of
aposporous sacs in an ovule varies from one to many depending on the species.
Mature ...
9
Botany For Degree Pteridophyta
f. 1. It. I Epidermis "In 5 . “ L: I ilk" I ' .. Mesophyll Root J Fig. 1.2 (A-.]). Apogamy
and Apospory in ferns. A. Apogamous sporophyte arising from the gametophyte
of (After Ian g); B—C. Aposporous gametophytes arising from the primary leaves
of ...
10
Molecular Breeding for the Genetic Improvement of Forage ...
Materials and methods A mapping population of 113 individuals was generated
by crossing a tetraploid sexual plant (Q4188) with an aposporous individual from
accession Q4117. Progenies were classified for their mode of reproduction ...
Mervyn O. Humphreys, 2005
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