Wyniki wyszukiwania

1

Localization of calcium-dependent ATPase in germinating pollen grain and pollen tube in Vicia faba

100%

Bednarska E.

Folia Histochemica et Cytobiologica

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1993

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tom 31

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nr 3

2

Cytological events during progamic phase in maize [Zea mays L.]

100%

Mol R., Filek M., Dubert F., Matthys-Rochon E.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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1999

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tom 41

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nr 1

3

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Cytoembryological analysis of causes for poor seed set in alfalfa (Medicago sativa L.)

84%

Mol R., Weigt D., Broda Z.

Acta Biologica Cracoviensia. Series Botanica

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2011

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tom 53

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nr 1

Poor seed set is a limiting factor in alfalfa breeding, as it slows the selection response. One strategy used to overcome this problem is to search for mutations of inflorescence morphology. Long-peduncle (lp), branched-raceme (br) and top-flowering (tf) inflorescence mutations increase the number of flowers per inflorescence, but they do not improve seed set per flower. Here we assessed pollen tube growth in styles of those inflorescence mutants and we observed embryo and endosperm development in seeds 1 to 16 days after pollination (DAP). The number of pollen tubes penetrating the style and the ovary was similar in all tested mutants and in the reference cultivar Radius. At 2 DAP, fertilized ovules were 2.7–3.9 times less numerous in certain inflorescence mutants than in the short-raceme cv. Radius. Ovule degeneration progressed at 2–4 DAP in all analyzed plants. Most ovules were not properly developed in the control cultivar (62%), nor in the forms with mutated inflorescence morphology (69–86%). The number of seeds per pod was lowest in the tf form despite its having the highest number of ovules per ovary. It appears that the number of ovules per pistil is not a crucial factor in seed set in alfalfa when fertilization efficiency is very low. Both poor fertilization and gradual ovule degeneration were factors causing poor seed set in the investigated alfalfa genotypes.

4

Evaluation of pollen fertility in pepino (Solanum muricatum Ait.)

84%

Kowalczyk K., Kobryn J., Zielinski W.

Folia Horticulturae

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2008

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tom 20

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nr 1

5

Impact of manganese on pollen germination and tube growth in Lily

84%

Sawidis T., Baycu G., Weryszko-Chmielewska E., Sulborska A.

Acta Agrobotanica

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2021

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tom 74

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nr 1

6

Abortive embryogenesis in Taiwan fir [Abies kawakamii Hayata-Ito]

84%

Kormutak A., Yang J. C.

Bulletin of the Polish Academy of Sciences. Biological Sciences

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1997

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tom 45

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nr 2-4

7

Intra- and interspecific pollination between Lupinus albus L., Lupinus mutabilis Sweet. and Lupinus angustifolius L.

67%

Przyborowski J. A., Samborska-Ciania A., Wiwart M.

Journal of Applied Genetics

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1996

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tom 37

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nr 3

The pollen grain germination and the growth of pollen tubes after intra- and interspecific reciprocal pollination of Lupinus albus L., L. mutabilis Sweet, and L. angustifolius L. were examined. Results of microscopic observations of pollen grain germination and pollen tube growth enable to deny the existence of certain barriers that prevent fertilization after pollination of L. albus flowers with pollen of L. angustifolius and vice versa, as well as after pollination of L. mutabilis flowers with pollen of L. angustifolius and vice versa. Some delay in pollen grain germination and a slower growth of pollen tubes were observed in all combinations, as related to intraspecific ones, though in the case of each interspecific combination pollen tubes reached the ovary. Moreover, a different level of pollination efficiency (the number of growing pollen tubes) and various rates of pollen grain germination and pollen tube growth, depending on the direction of pollination, were found. The noted pollination efficiency may generally be considered to be low.

8

The discovery of sexual reproduction in higher plants

59%

Cresti M., Linskens H. F.

Acta Biologica Cracoviensia. Series Botanica

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1999

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tom 41

A brief historical overview of the discovery of sexuality in flowering plants (Angiosperms) is given. The former assumption that pictures on Assyrian and Babylonian buildings represent pollination activity has to be corrected by new archeological insights. Antiquity and the Middle Ages delivered no real progress in the knowledge of higher plant sexuality. Real progress is linked to the introduction of light microscopy and experimentation. Investigators such as N. Grew, J. Bobart and R. J. Camerarius provided new information on sex organs in plants. Countercurrents of opinion remained active, based on Aristotle’s and Theophrastus’s beliefs. J.G. Koelreuter and G.B. Amici made breakthroughs in the recognition of the equal role of the sexes in reproduction. Fusion of the sperm and egg nuclei was observed by E. Strasburger. Double fertilization was a multiple discovery by S. Navashin and L. Guignard. New strategies are making the sexual and fertilization processes amenable to genetic manipulation and biotechnology.

Ograniczanie wyników

Localization of calcium-dependent ATPase in germinating pollen grain and pollen tube in Vicia faba

Cytological events during progamic phase in maize [Zea mays L.]

Cytoembryological analysis of causes for poor seed set in alfalfa (Medicago sativa L.)

Evaluation of pollen fertility in pepino (Solanum muricatum Ait.)

Impact of manganese on pollen germination and tube growth in Lily

Abortive embryogenesis in Taiwan fir [Abies kawakamii Hayata-Ito]

Intra- and interspecific pollination between Lupinus albus L., Lupinus mutabilis Sweet. and Lupinus angustifolius L.

The discovery of sexual reproduction in higher plants