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Expression of a putative grapevine hexose transporter in tobacco alters morphogenesis and assimilate partitioning.

Abstract：

:Tobacco plants were transformed by leaf disc regeneration with the VvHT1 (Vitis vinifera hexose transporter 1) cDNA under the control of the constitutive CaMV 35S promoter in a sense or antisense orientation. Among the 20 sense plants and 10 antisense plants obtained, two sense plants showed a mutant phenotype when grown in vitro, with stunted growth and an increase in the (leaves+stem)/roots dry weight ratio. The rate of [(3)H]-glucose uptake in leaf discs from these plants was decreased to 25% of the value measured in control plants. The amount of VvHT1 transgene and of host monosaccharide transporter MST transcripts in the leaves were studied by RNA gel blot analysis. The VvHT1 transcripts were usually present, but the amount of MST transcripts was the lowest in the plants that exhibited the most marked phenotype. Although the phenotype was lost when the plants were transferred from in vitro to greenhouse conditions, it was found again in vitro in the progeny obtained by self-pollination or by back-cross. The data show that VvHT1 sense expression resulted in unidirectional post-transcriptional gene inactivation of MST in some of the transformants, with dramatic effects on growth. They provide the first example of plants modified for hexose transport by post-transcriptional gene silencing. Some of the antisense plants also showed reduced expression of MST, and decreased growth. These results indicate that, like the sucrose transporters, hexose transporters play an important role in assimilate transport and in morphogenesis.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Leterrier M,Atanassova R,Laquitaine L,Gaillard C,Coutos-Thévenot P,Delrot S

doi

10.1093/jxb/erg119

keywords:

subject

Has Abstract

pub_date

2003-04-01 00:00:00

pages

1193-204

issue

385

eissn

0022-0957

issn

1460-2431

journal_volume

54

pub_type

杂志文章

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