Abstract
The effect of arsenate with or without phosphate on the growth and sugar metabolism in rice seedlings cv. MTU 1010 was studied. Arsenate was found to be more toxic for root growth than shoot growth and water content of the seedlings gradually decreased with increasing concentrations. Arsenate exposure at 20 μM and 100 μM resulted in an increase in reducing sugar content and decrease in non-reducing sugar content. There was a small increase in starch content, the activity of starch phosphorylase was increased but α-amylase activity was found to be decreased. Arsenate toxicity also affected the activities of different carbohydrate metabolizing enzymes. The activities of sucrose degrading enzymes viz., acid invertase and sucrose synthase were increased whereas, the activity of sucrose synthesizing enzyme, viz. sucrose phosphate synthase declined. The combined application of arsenate with phosphate exhibited significant alterations of all the parameters tested under the purview of arsenate treatment alone which was congenial to better growth and efficient sugar metabolism in rice seedlings. Thus, the use of phosphorus enriched fertilizers may serve to ensure the production of healthy rice plants in arsenic contaminated soils.
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Abbreviations
- As:
-
arsenic
- cv.:
-
cultivar
- DNSA:
-
3,5-dinitrosalicylic acid
- DTT:
-
dithiothreitol
- EDTA:
-
ethylenediamine tetraacetic acid
- fw:
-
fresh weight
- HEPES:
-
N-2-Hydroxyethylpiperazine-N′-2-ethanesulfonic acid
- KI:
-
potassium iodide
- PFD:
-
photon flux density
- PMSF:
-
phenyl methyl sulphonyl fluoride
- SE:
-
standard error
- SPS:
-
sucrose phosphate synthase
- SS:
-
sucrose synthase
- TCA:
-
trichloroacetic acid
- UDP:
-
uridine-di-phosphate
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Choudhury, B., Mitra, S. & Biswas, A.K. Regulation of sugar metabolism in rice (Oryza sativa L.) seedlings under arsenate toxicity and its improvement by phosphate. Physiol Mol Biol Plants 16, 59–68 (2010). https://doi.org/10.1007/s12298-010-0008-8
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DOI: https://doi.org/10.1007/s12298-010-0008-8