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Dynamics of vegetative cytoplasm during generative cell formation and pollen maturation in Arabidopsis thalianaUltrastructural changes of pollen cytoplasm during generative cell formation and pollen maturation in Arabidopsis thaliana were studied. The pollen cytoplasm develops a complicated ultrastructure and changes dramatically during these stages. Lipid droplets increase after generative cell formation and their organization and distribution change with the developmental stage. Starch grains in amyloplasts increase in number and size during generative and sperm cell formation and decrease at pollen maturity. The shape and membrane system of mitochondria change only slightly. Dictyosomes become very prominent, and numerous associated vesicles are observed during and after sperm cell formation. Endoplasmic reticulum appears extensively as stacks during sperm cell formation. Free and polyribosomes are abundant in the cytoplasm at all developmental stages although they appear denser at certain stages and in some areas. In mature pollen, all organelles are randomly distributed throughout the vegetative cytoplasm and numerous small particles appear. Organization and distribution of storage substances and appearance of these small particles during generative and sperm cell formation and pollen maturation are discussed.
Document ID
20040089385
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kuang, A. (Louisiana State University Agricultural Center Baton Rouge, United States)
Musgrave, M. E.
Date Acquired
August 21, 2013
Publication Date
January 1, 1996
Publication Information
Publication: Protoplasma
Volume: 194
ISSN: 0033-183X
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-3759
CONTRACT_GRANT: NAG10-0075
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Plant Biology