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OtherDEVELOPMENT AND GROWTH REGULATION
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Synthesis of Small Heat-Shock Proteins Is Part of the Developmental Program of Late Seed Maturation

N. Wehmeyer, L. D. Hernandez, R. R. Finkelstein, E. Vierling
N. Wehmeyer
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L. D. Hernandez
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R. R. Finkelstein
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E. Vierling
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Published October 1996. DOI: https://doi.org/10.1104/pp.112.2.747

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Abstract

Small heat-shock proteins (sHSPs) accumulate in plants in response to high-temperature stress. Specific sHSPs, the cytosolic class I and class II proteins, are also expressed in the absence of stress in maturing seeds of several species, and a role for these proteins in desiccation tolerance, dormancy, or germination has been hypothesized. We demonstrate that class I sHSPs are expressed during Arabidopsis seed development in a pattern similar to that previously observed in other species: they are first detected during mid-maturation, are most abundant in dry seeds, and decline rapidly during germination. Although the class I sHSP family in Arabidopsis appears to consist of four genes, expression of a single gene, Athsp17.4, accounts for the majority of sHSPs in maturing seeds. sHSP levels were also examined in seeds of several Arabidopsis mutants with reduced sensitivity to abscisic acid inhibition, including aba1, abi1 and abi2, abi3–1, abi3–6, abi4, and abi5–1. The abi3–1 mutant has 10-fold reduced levels of sHSPs; sHSPs are undetectable in the abi3–6 mutant. All other mutants were indistinguishable from wild type. These results suggest that sHSP expression in seeds is regulated by the ABI3 response pathway and wild-type levels of sHSPs are not sufficient for seed dormancy and not necessary for desiccation tolerance. However, roles in either process cannot be ruled out. In total the data indicate that the expression of sHSPs in seeds is part of the normal developmental program of late seed maturation and the presence of sHSPs has adaptive significance for plant reproduction.

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Synthesis of Small Heat-Shock Proteins Is Part of the Developmental Program of Late Seed Maturation
N. Wehmeyer, L. D. Hernandez, R. R. Finkelstein, E. Vierling
Plant Physiology Oct 1996, 112 (2) 747-757; DOI: 10.1104/pp.112.2.747

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Synthesis of Small Heat-Shock Proteins Is Part of the Developmental Program of Late Seed Maturation
N. Wehmeyer, L. D. Hernandez, R. R. Finkelstein, E. Vierling
Plant Physiology Oct 1996, 112 (2) 747-757; DOI: 10.1104/pp.112.2.747
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Plant Physiology
Vol. 112, Issue 2
Oct 1996
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More in this TOC Section

  • The rms1 Mutant of Pea Has Elevated Indole-3-Acetic Acid Levels and Reduced Root-Sap Zeatin Riboside Content but Increased Branching Controlled by Graft-Transmissible Signal(s)
  • Bacterial Cellulose-Binding Domain Modulates in Vitro Elongation of Different Plant Cells
  • Gibberellin Dose-Response Regulation of GA4 Gene Transcript Levels in Arabidopsis
Show more DEVELOPMENT AND GROWTH REGULATION

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