Title: Drought‐induced Short Roots in <i>Arabidopsis thaliana</i>: Structural Characteristics
Abstract: Abstract In Arabidopsis thaliana , as in other Brassicaceae species, a progressive drought stress induced changes in root morphogenesis: from a threshold plant water deficit, the new emerging roots remain short, hairless and often take a tuberized shape at their base while drought persists. The organization of these drought‐induced roots was examined in light microscopy in Arabidopsis thaliana , Columbia wild‐type ecotype, and compared to the normal, well‐watered lateral roots. The main structural traits were the absence of elongation zone, the arrest of cell cap expansion, the lack of root hairs (despite epidermal differentiation in trichoblasts and atrichoblasts) and the radial enlargement of epidermal and cortical cells. The early differentiation, close to the short root apex, of large and highly lignified metaxylem elements, the absence of starch accumulation in hypertrophied cortical cells appeared to be characteristic of the species Arabidopsis , as compared to other Brassicaceae. These structural alterations are discussed in terms of drought‐induced changes in gene expression with regard to similar modifications described in root morphogenesis and root hair‐defective Arabidopsis mutants.
Publication Year: 1995
Publication Date: 1995-10-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 12
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