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KMID : 0368420060490060513
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Journal of Plant Biology
2006 Volume.49 No. 6 p.513 ~ p.517
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Effect of sulfur on nitrate reductase and ATP sulfurylase Activities in groundnut (Arachis hypogea L.)
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Jamal Arshad
Fazli Inayat Saleem
Ahmad Saif
Kim Ki-Taek
Oh Dae-Geun
Abdin Malik Zainul
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Abstract
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Field experiments were conducted to determine the effect of sulfur (S) and Nitrogen (N) on nitrate reductase (NR) and ATP-sulfurylase activities in groundnut cultivars (Arachis hypogea L. cv. Ambar and Kaushal). Two combinations of S (in kg ha-1): OS (-S) and 20S (+S) were used with 20 kg ha-1 N. The application of S enhanced the NR and ATP-sulfurylase activities in both the cultivars at all the growth stages. The application of S also increased soluble protein and chlorophyll content in the all growth stages of both the cultivars. NR and ATP-sulfurylase activities in the leaves were measured at various growth stages as the two enzymes catalyze the rate limiting steps of the assimilatory pathways of nitrate and sulfate, respectively.
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KEYWORD
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ATP-sulfurylase, chlorophyll, leaf soluble protein, nitrate reductase, sulfur
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