NDLI: The Soil Type Affects Both the Differential Accumulation of Iron between Wild-type and Ferritin Over-expressor Tobacco Plants and the Sensitivity of their Rhizosphere Bacterioflora to Iron Stress

Content Provider	Springer Nature Link
Author	Robin, Agnès Vansuyt, Gérard Corberand, Thérèse Briat, Jean François. Lemanceau, Philippe
Copyright Year	2006
Abstract	Transgenic tobacco P6 over-expressing ferritin is known to activate iron transport systems and to have increased iron content. Iron phytoextraction by this transgene is then expected to be higher than that of the wild-type (WT). In the present study, the possibility to modify iron availability for bacteria via the cultivation of the transgene P6 was explored by comparing the sensitivity to iron stress of bacteria isolated from the rhizosphere of the two plant genotypes (WT and P6). This sensitivity was evaluated by measuring the bacterial density when plated on a solid media depleted (supplemented with 8-hydroxiquinoline) or not (supplemented with Fe-8-hydroxyquinoline) in iron. The experimental conditions favorable to the differential iron accumulation between the wild-type and transgenic tobacco were identified. The two plant genotypes were grown in three soils (Hervau, Thory and Oudun) chosen for their differences in iron content, and the plants were yielded at three stages (vegetative, floral bud and flowering). The highest differential accumulation of iron in favor of the over-expressing transgene was found in the plants at the floral bud stage when cultivated in the Oudun and Thory soils. Since at that stage, the plant growth was significantly higher in the Oudun soil, the phytoextraction of iron was the highest in this soil. At the floral bud stage, bacteria isolated from the rhizosphere of the transgene cultivated in the Oudun and Thory soils appeared to be less susceptible to iron stress than those from the wild-type. Bacterial density recovered on agar medium depleted in iron was significantly the highest in the rhizosphere of the transgene cultivated in the Oudun soil. Altogether, these data indicate that the over-expressing ferritin transgenic plants, that accumulate and extract more iron from the rhizosphere than the wild-type plants, select in their rhizosphere bacteria less susceptible to iron stress compared to those selected by the wild-type plants.
Starting Page	73
Ending Page	81
Page Count	9
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	283
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	bacterioflora ferritin iron rhizosphere tobacco Plant Sciences Ecology Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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