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KMID : 0368420070500030351
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Journal of Plant Biology
2007 Volume.50 No. 3 p.351 ~ p.357
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Interactive effect of sulfur and nitrogen on nitrate reductase and ATP-sulfurylase activities in relation to seed yield fromPsoralea corylifolia L.
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Ahmad Saif
Fazli Inayat Saleem
Jamal Arshad
Iqbal Mohd
Abdin Malik Zainul
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Abstract
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Field experiments were conducted to determine the interactive effect of sulfur (S) and nitrogen (N) applications on seed yield fromPsoralea corylifolia L. Six treatments were tested: T1 = control (without manure and fertilizers), T2 = manure @ 9 kg plot-1 (10 t ha-1), T3 = S0 N20 Ko P40, T4 = S20 N20 K40 P40, T5 = S20+20 N20 K40 P40, and T6 = S20+20 N20+20 K40P40. Activities of nitrate reductase (NR) and ATP-sulfurylase in the leaves were measured at various phenological stages. These two enzymes catalyze the rate-limiting steps in the respective assimilatory pathways for nitrate and sulfate. Enzyme activity was strongly correlated with seed yield, with the greatest performance being achieved with treatment T5. This might be attributed to the optimization of leaf soluble protein and photosynthetic rate, both of which are influenced by S and N assimilation.
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KEYWORD
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ATP-sulfurylase, nitrate reductase, nitrogen, Psoralea corylifolia, seed yield, sulfur
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