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Ultrastructural study on dynamics of plastids and mitochondria during microgametogenesis in watermelon.
MedLine Citation:
PMID:  22079899     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Dynamics of plastids and mitochondria during microgametogenesis in watermelon were examined by means of transmission electron microscopy. Plastids are present as proplastids in the microspore and as amyloplasts in the vegetative cell of the bicellular pollen grain, whereas the generative cell is completely devoid of plastids, suggesting that microspore plastids are excluded from the generative cell during the microspore mitotic division. Therefore, watermelon is classified as Lycopersicon type, where plastids exclusion from the generative cell leads to purely maternal plastid inheritance. Mitochondria in the generative cell show noticeable alterations in size and cristae during microgametogenesis. The diameter of mitochondria is about 0.5μm in the newly born generative cell, while only about 0.16μm in the spindle-shaped generative cell. Numerous cristae are present in mitochondria in the spherical generative cell, but, in contrast, mere two or three cristae retain in the spindle-shaped generative cell in the mature pollen grain. In conclusion, the size and cristae number of mitochondria in the generative cell are reduced significantly during microgametogensis in watermelon.
Authors:
Lin Liu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-20
Journal Detail:
Title:  Micron (Oxford, England : 1993)     Volume:  -     ISSN:  1878-4291     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9312850     Medline TA:  Micron     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Affiliation:
College of Life Sciences, Linyi University, Linyi 276000, China.
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