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Root graviresponsiveness and cellular differentiation in wild-type and a starchless mutant of Arabidopsis thalianaPrimary roots of a starchless mutant of Arabidopsis thaliana L. are strongly graviresponsive despite lacking amyloplasts in their columella cells. The ultrastructures of calyptrogen and peripheral cells in wild-type as compared to mutant seedlings are not significantly different. The largest difference in cellular differentiation in caps of mutant and wild-type roots is the relative volume of plastids in columella cells. Plastids occupy 12.3% of the volume of columella cells in wild-type seedlings, but only 3.69% of columella cells in mutant seedlings. These results indicate that: (1) amyloplasts and starch are not necessary for root graviresponsiveness; (2) the increase in relative volume of plastids that usually accompanies differentiation of columella cells is not necessary for root graviresponsiveness; and (3) the absence of starch and amyloplasts does not affect the structure of calyptrogen (i.e. meristematic) and secretory (i.e. peripheral) cells in root caps. These results are discussed relative to proposed models for root gravitropism.
Document ID
20040090372
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Moore, R.
(Wright State University Dayton, Ohio 45435)
Date Acquired
August 21, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Annals of botany
Volume: 64
ISSN: 0305-7364
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-734
Distribution Limits
Public
Copyright
Other
Keywords
NASA Program Space Biology
NASA Discipline Number 29-20
NASA Discipline Plant Biology
Non-NASA Center

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