Effect of mineral sulphur availability on nitrogen and sulphur uptake and remobilization during the vegetative growth of Brassica napus L.
Because it has a high demand for sulphur (S), oilseed rape is particularly sensitive to S limitation. However, the physiological effects of S limitation remain unclear, especially during the rosette stage. For this reason a study was conducted to determine the effects of mineral S limitation on nitrogen (N) and S uptake and remobilization during vegetative growth of oilseed rape at both the whole-plant and leaf rank level for plants grown during 35 d with 300 microM (34)SO(4)(2-) (control plants; +S) or with 15 microM (34)SO(4)(2-) (S-limited plants; -S). The results highlight that S-limited plants showed no significant differences either in whole-plant and leaf biomass or in N uptake, when compared with control plants. However, total S and (34)S (i.e. deriving from S uptake) contents were greatly reduced for the whole plant and leaf after 35 d, and a greater redistribution of endogenous S from leaves to the benefit of roots was observed. The relative expression of tonoplast and plasmalemma sulphate transporters was also strongly induced in the roots. In conclusion, although S-limited plants had 20 times less mineral S than control plants, their development remained surprisingly unchanged. During S limitation, oilseed rape is able to recycle endogenous S compounds (mostly sulphate) from leaves to roots. However, this physiological adaptation may be effective only over a short time scale (i.e. vegetative growth).
Abdallah
M
M
UMR INRA-UCBN 950 Ecophysiologie Végétale, Agronomie et Nutritions N, C, S (EVA), Institut National de la Recherche Agronomique, University of Caen, Caen, France.
Dubousset
L
L
Meuriot
F
F
Etienne
P
P
Avice
J-C
JC
Ourry
A
A
D027321:Anion Transport Proteins / Q000235:genetics / Q000378:metabolism; D018533:Biomass; D029688:Brassica napus / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D008903:Minerals / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D009587:Nitrogen Isotopes / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism; D013431:Sulfates / Q000378:metabolism; D013455:Sulfur / Q000378:metabolism*; D013460:Sulfur Isotopes / Q000378:metabolism
D027321:Anion Transport Proteins; D008903:Minerals; D009587:Nitrogen Isotopes; D013431:Sulfates; D013460:Sulfur Isotopes; D013455:Sulfur; D009584:Nitrogen
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