Apoptosis-like degradation of pollen grains in siberian squill related to the lack of low temperatures during their development

Apoptosis-like degradation of pollen grains in siberian squill related to the lack of low... Low temperature is necessary for completing the cycle of anther development in early-spring ephemeroids. Pollen grains were investigated in Scilla sibirica L. growing under natural conditions in a park and taken to a greenhouse for the cold season. In control plants grown in the open ground, the development of microspores was normal. The plants transferred to the greenhouse sharply differed from control material. By the middle of November, the aggregations of condensed chromatin were formed near the nucleus envelope of their generative cells. In some mitochondria, the system of cristae was reduced. In December, all the mitochondria showed a reduced system of cristae. In the matrix of some mitochondria with ruptured envelopes, rather large vesicles were detected. In the vegetative and generative cells, autophagic vacuoles were formed. They also occurred in the nucleus itself; as a result, the cells of pollen grains became much more vacuolated. In January, only the products of protoplast lysis were detected in all the pollen grains. It was concluded that the lack of low temperatures induced apoptosis-like degradation of the cells of Siberian squill pollen grains. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Apoptosis-like degradation of pollen grains in siberian squill related to the lack of low temperatures during their development

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Publisher
Springer Journals
Copyright
Copyright © 2009 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Sciences ; Plant Physiology
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443709060168
Publisher site
See Article on Publisher Site

Abstract

Low temperature is necessary for completing the cycle of anther development in early-spring ephemeroids. Pollen grains were investigated in Scilla sibirica L. growing under natural conditions in a park and taken to a greenhouse for the cold season. In control plants grown in the open ground, the development of microspores was normal. The plants transferred to the greenhouse sharply differed from control material. By the middle of November, the aggregations of condensed chromatin were formed near the nucleus envelope of their generative cells. In some mitochondria, the system of cristae was reduced. In December, all the mitochondria showed a reduced system of cristae. In the matrix of some mitochondria with ruptured envelopes, rather large vesicles were detected. In the vegetative and generative cells, autophagic vacuoles were formed. They also occurred in the nucleus itself; as a result, the cells of pollen grains became much more vacuolated. In January, only the products of protoplast lysis were detected in all the pollen grains. It was concluded that the lack of low temperatures induced apoptosis-like degradation of the cells of Siberian squill pollen grains.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Nov 6, 2009

References

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