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Three stages of meiotic homologous chromosome pairing in wheat: cognition, alignment and synapsis
Springer Science and Business Media LLC - - 1997
Trude Schwarzacher
Chromosome painting enabled the study of homologous chromosome behaviour prior to and during meiosis. Total genomic DNA from rye, used as a probe for in situ hybridization, identified the rye chromosome arm in a wheat-rye translocation line (T5AS·5RL) at meiotic prophase and the preceding interphase. Accurate staging of the development of the meiocytes was attained by parallel studies of chromati...... hiện toàn bộ
The evolution of double fertilization and endosperm: an ”historical” perspective
Springer Science and Business Media LLC - Tập 11 - Trang 6-16 - 1998
William E. Friedman
One hundred years ago, the developmental origin of endosperm from double fertilization was discovered independently by Navashin and Guignard. For much of the twentieth century, specific events related to the evolutionary origin of the endosperm of flowering plants remained a mystery. However, during the past 20 years, advances in phylogenetic reconstruction of seed plants, genetic theory associat...... hiện toàn bộ
An ultrastructural study of the mature spermatozoid of the fern Asplenium trichomanes L. subsp. trichomanes
Springer Science and Business Media LLC - Tập 10 - Trang 142-148 - 1997
P. Gori, Simonetta Muccifora, Sheridan L. Woo, Lorenza M. Bellani
Asplenium trichomanes L. subsp. trichomanes spermatozoids are spirals of about five turns. Keels link the elements of the microtubular ribbon with the plates of the lamellar layer (LL) which are uninterrupted, parallel and curved with an inner angle of about 150°. Electron-opaque filaments connect the microtubules of the multilayered structure (MLS) and the osmiophilic crest, the LL and the MLS-a...... hiện toàn bộ
Evidence for spontaneous diploid androgenesis in Brassica napus L.
Springer Science and Business Media LLC - Tập 2 - Trang 15-17 - 1989
B. Y. Chen, W. K. Heneen
Seeds of androgenetic origin were obtained among the F1 progenies of two crosses between resynthesized and cultivated forms of Brassica napus. The high-erucic, white-flowered, resynthesized line No7076 acted as the female, and the zero-erucic, yellow-flowered, cultivars ‘Topas’ and ‘Puma’, as males. No androgenetic seeds were obtained in the reciprocal crosses. Resynthesized rape could thus be of ...... hiện toàn bộ
Acknowledgements to referees 2003
Springer Science and Business Media LLC - Tập 16 - Trang 311-311 - 2004
Localization and fine mapping of gaMS-1, a male gametophytic mutant of maize
Springer Science and Business Media LLC - Tập 14 - Trang 95-99 - 2001
R. Fink, E. Gatti, L. Gianfranceschi, A. Gallavotti, P. G. Isaac, M. Sari-Gorla, M. E. Pè
Post-meiotic mutants affecting pollen development are fundamental tools for defining the genetic program controlling microsporogenesis and pollen function. An example of such mutants is gametophytic male sterile-1 (gaMS-1). Heterozygous plants gaMS-1/+ that have a normal phenotype and are female fertile, segregate 1:1 normal:sterile pollen grains and their selfed progeny segregates 1:1 normal:semi...... hiện toàn bộ
Some permeability properties of angiosperm pollen grains, pollen tubes and generative cells
Springer Science and Business Media LLC - Tập 1 - Trang 65-73 - 1988
J. Heslop-Harrison, Y. Heslop-Harrison
The permeability of pollen grains, pollen tubes and generative cells of Helleborus foetidus and Galanthus nivalis has been investigated using four probes spanning a wide range of molecular weights: 4,6-diamidino-2-phenyl indole (DAPI; mol.wt. 350). Evans blue (mol.wt. 960), FITC-dextran (average mol.wt. 19400) and FITC-albumin (average mol.wt. 67000). DAPI penetrated into the vegetative cells of d...... hiện toàn bộ
Cloning and characterisation of two CTR1-like genes in Cucurbita pepo: regulation of their expression during male and female flower development
Springer Science and Business Media LLC - Tập 23 - Trang 301-313 - 2010
Susana Manzano, Cecilia Martínez, Pedro Gómez, Dolores Garrido, Manuel Jamilena
Ethylene is an essential regulator of flower development in Cucurbita pepo, controlling the sexual expression, and the differentiation and maturation of floral organs. To study the action mechanism of ethylene during the male and female flower development, we have identified two CTR1 homologues from C. pepo, CpCTR1 and CpCTR2, and analysed their expressions during female and male flower developmen...... hiện toàn bộ
Herbicide-tolerant corn by pollen selection
Springer Science and Business Media LLC - Tập 2 - Trang 65-69 - 1989
M. Sari Gorla, E. Ottaviano, E. Frascaroli, P. Landi
Maize pollen was exposed to the herbicide Chlorsulfuron (CS), and segregation for tolerance was observed. The resulting plant generation exhibited significantly greater tolerance to CS than other (control) progeny. Since the increase in tolerance occurred after only one generation of pollen exposure, this result demonstrates that pollen selection can be used to develop herbicide-resistant crop spe...... hiện toàn bộ
Incidence and post-pollination mechanisms of nonrandom mating in Arabidopsis thaliana
Springer Science and Business Media LLC - Tập 22 - Trang 257-262 - 2009
Ann L. Carlson, Megan Telligman, Robert J. Swanson
Compatible pollinations from many different taxa display nonrandom mating. Here we describe a system for examining questions of nonrandom mating in Arabidopsis thaliana. Using this system, we demonstrate that Arabidopsis thaliana displays nonrandom mating between distinct accessions. Statistical analysis of these data demonstrates aspects of both pollen competition and male–female complementarity ...... hiện toàn bộ
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