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Ultracytochemical localization of calcium in rice central cell before and after fertilization

100%

Yang J., Zhao J., Liang S. P., Yang H. Y.

Acta Biologica Cracoviensia. Series Botanica

2002

tom 44

Temporal and spatial changes of calcium distribution in rice central cells were studied ultracytochemically by potassium antimonate precipitation. Before anthesis the calcium level was quite low. Calcium increased remarkably just after pollination and then decreased again gradually. Calcium precipitates were localized in the polar nuclei, including the nucleolus and nucleoplasm, and the cytoplasm surrounding polar nuclei. In the large central vacuole the calcium amount was negligible, though pollination-independent calcium elevation occurred in the chalazal region of the vacuole. During fertilization, abundant calcium was found in the fusing sperm and polar nuclei. Fertilization-induced calcium accumulation in the micropylar region of the central vacuole appeared after fertilization and during early mitosis of free endosperm nuclei. No obvious change of calcium level was observed in emasculated but unpollinated central cells, and in this case the level was much lower than in pollinated central cells. Calcium was also localized in the antipodal cells, embryo sac wall and nucellus, and no change was observed in these places before and after pollination.

Light microscopy study on the kinetics of double fertilisation in Secale cereale L.

80%

Jurkowska K. A., Mol R.

Biological Bulletin of Poznań

2001

tom 38

nr 1

Ultrastructure of the cephalic rosette glands in Mesidotea entomon [L.]

70%

Broekere-Biesiadka B., Hryniewiecka-Szyfter Z.

Bulletin de la Societe des Amis des Sciences et des Lettres de Poznan. Seria D: Science Biologiques

1992

tom 29

Ograniczanie wyników

1 Acta Biologica Cracoviensia. Series Botanica

1 Biological Bulletin of Poznań

1 Bulletin de la Societe des Amis des Sciences et des Lettres de Poznan. Seria D: Science Biologiques

1 Broekere-Biesiadka B.

1 Hryniewiecka-Szyfter Z.

1 Jurkowska K. A.

1 Liang S. P.

1 Mol R.

1 Yang H. Y.

1 Yang J.

1 Zhao J.

1 2002

1 2001

1 1992

Wyniki wyszukiwania

Ultracytochemical localization of calcium in rice central cell before and after fertilization

Light microscopy study on the kinetics of double fertilisation in Secale cereale L.

Ultrastructure of the cephalic rosette glands in Mesidotea entomon [L.]