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Amyloplast division progresses simultaneously at multiple sites in the endosperm of rice.
Plant Cell Physiol. 2009 Sep; 50(9):1617-26.PC

Abstract

The amyloplast, a form of differentiated plastid, proliferates in sink tissues, where it synthesizes and stores starch granules. Little is known about the molecular mechanism for amyloplast division and development. The rice (Oryza sativa) endosperm provides an excellent model system for studying molecular mechanisms involved in amyloplast division and starch synthesis. We compared amyloplast division processes in the endosperm of wild type and a mutant of ARC5, a member of the dynamin superfamily. Plant growth and fertility of arc5 were not significantly different from the wild type. Unlike binary fission of chloroplast in the leaf, small amyloplasts in the endosperm of wild type divide simultaneously at multiple sites, generating a beads-on-a-string structure. In addition, large amyloplasts divide by budding-type division, giving rise to small amyloplasts attached to their surfaces. ARC5 and FtsZ2-1 fused to fluorescent proteins were targeted to the constriction sites in dividing amyloplasts. Both the loss of function of ARC5 and overexpression of ARC5 fusion proteins in the endosperm did not produce spherical amyloplasts with increased diameter, but produced either fused amyloplasts with thick connections or pleomorphic types, suggesting that proper stoichiometry between ARC5 and other components in the amyloplast division machinery is necessary for the completion of the late stage of amyloplast division. The size distribution of starch granules purified from arc5 was shifted to small and the starch gelatinization peak temperature was significantly higher than for wild-type starch, suggesting that amyloplast division processes have a significant effect on starch synthesis.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Yun MS
Division of Plant Sciences, National Institute of Agrobiological Sciences, Kannondai, Tsukuba, Japan.
Kawagoe Y
No affiliation info available

MeSH

DynaminsGene Expression Regulation, PlantMutationOryzaPlant LeavesPlant ProteinsPlants, Genetically ModifiedPlastidsSeedsStarch

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19622530

Citation

Yun, Min-Soo, and Yasushi Kawagoe. "Amyloplast Division Progresses Simultaneously at Multiple Sites in the Endosperm of Rice." Plant & Cell Physiology, vol. 50, no. 9, 2009, pp. 1617-26.
Yun MS, Kawagoe Y. Amyloplast division progresses simultaneously at multiple sites in the endosperm of rice. Plant Cell Physiol. 2009;50(9):1617-26.
Yun, M. S., & Kawagoe, Y. (2009). Amyloplast division progresses simultaneously at multiple sites in the endosperm of rice. Plant & Cell Physiology, 50(9), 1617-26. https://doi.org/10.1093/pcp/pcp104
Yun MS, Kawagoe Y. Amyloplast Division Progresses Simultaneously at Multiple Sites in the Endosperm of Rice. Plant Cell Physiol. 2009;50(9):1617-26. PubMed PMID: 19622530.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Amyloplast division progresses simultaneously at multiple sites in the endosperm of rice. AU - Yun,Min-Soo, AU - Kawagoe,Yasushi, Y1 - 2009/07/20/ PY - 2009/7/23/entrez PY - 2009/7/23/pubmed PY - 2009/10/17/medline SP - 1617 EP - 26 JF - Plant & cell physiology JO - Plant Cell Physiol VL - 50 IS - 9 N2 - The amyloplast, a form of differentiated plastid, proliferates in sink tissues, where it synthesizes and stores starch granules. Little is known about the molecular mechanism for amyloplast division and development. The rice (Oryza sativa) endosperm provides an excellent model system for studying molecular mechanisms involved in amyloplast division and starch synthesis. We compared amyloplast division processes in the endosperm of wild type and a mutant of ARC5, a member of the dynamin superfamily. Plant growth and fertility of arc5 were not significantly different from the wild type. Unlike binary fission of chloroplast in the leaf, small amyloplasts in the endosperm of wild type divide simultaneously at multiple sites, generating a beads-on-a-string structure. In addition, large amyloplasts divide by budding-type division, giving rise to small amyloplasts attached to their surfaces. ARC5 and FtsZ2-1 fused to fluorescent proteins were targeted to the constriction sites in dividing amyloplasts. Both the loss of function of ARC5 and overexpression of ARC5 fusion proteins in the endosperm did not produce spherical amyloplasts with increased diameter, but produced either fused amyloplasts with thick connections or pleomorphic types, suggesting that proper stoichiometry between ARC5 and other components in the amyloplast division machinery is necessary for the completion of the late stage of amyloplast division. The size distribution of starch granules purified from arc5 was shifted to small and the starch gelatinization peak temperature was significantly higher than for wild-type starch, suggesting that amyloplast division processes have a significant effect on starch synthesis. SN - 1471-9053 UR - https://www.unboundmedicine.com/medline/citation/19622530/Amyloplast_division_progresses_simultaneously_at_multiple_sites_in_the_endosperm_of_rice_ DB - PRIME DP - Unbound Medicine ER -