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Entopically-additive expression of GLABRA2 alters the frequency and spacing of trichome initiation. (Articolo in rivista)

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Entopically-additive expression of GLABRA2 alters the frequency and spacing of trichome initiation. (Articolo in rivista) (literal)

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Ohashi Y. 1, Oka A. 1, Ruberti I. 2, Morelli G. 3, Aoyama T. 1 (2002)
Entopically-additive expression of GLABRA2 alters the frequency and spacing of trichome initiation.
in Plant journal (Print); Blackwell Scientific Publications, Oxford (Regno Unito)
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The relevance of this work is the demonstration that the expression level of GLABAR2 acts as a quantitative factor through which frequency and spacing of trichome initiation are regulated. The paper is published in a valued international journal with an impact factor of 5.850. (literal)

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The paper shows that entopically additive expression of the HD-Zip GLABRA2 gene increases the number of trichomes and encourages development of adjacent trichomes. These results indicate that GLABRA2 is involved in trichome initiation as well as in trichome morphogenesis. (literal)

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1 UNI Kyoto (Institute for Chemical Research), 2 CNR (C.S. sugli Acidi Nucleici), 3 Istituto Nazionale di Ricerca per gli Alimenti e la Nutrizione. (literal)

Titolo

Entopically-additive expression of GLABRA2 alters the frequency and spacing of trichome initiation. (literal)

Abstract

GLABRA2 (GL2)/ATHB-10 encodes a homeodomain protein that belongs to the homeodomain-leucine zipper family. Mutant studies have revealed that this gene is involved in trichome, root-hair and seed-coat development. We used reverse genetics to investigate the role of GL2 in trichome development. A transgene consisting of a GL2-coding fragment preceded by the cauliflower mosaic virus 35S promoter (35S::GL2) did not complement defects in the gl2-1 mutant. In the wild-type genetic background, 35S::GL2 caused gl2-mutant-like and scarcely viable phenotypes, suggesting that ectopic overexpression of GL2 interrupts endogenous GL2 function in trichome development and is toxic to plants. On the other hand, another GL2 transgene containing the GL2 promoter (pGL2::GL2) complemented the gl2-1 mutation. Entopically additive expression of GL2 by introduction of pGL2::GL2 in the wild-type genetic background noticably increased the number of trichomes and induced production of adjacent trichomes. Consistent with this result, gl2-1/+ heterozygous leaves, whose GL2 expression was expected to decrease, had fewer trichomes than +/+ leaves. These results indicate that GL2 quantitatively regulates the frequency of trichome initiation and is involved in determining trichome spacing. (literal)

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