Title

Interactive effect of sulfur and nitrogen on nitrate reductase and ATP-sulfurylase activities in relation to seed yield from Psoralea corylifolia L.

Document Type

Article

Abstract

Field experiments were conducted to determine the interactive effect of sulfur (S) and nitrogen (N) applications on seed yield from Psoralea 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 K40 P40, T4 = S20 N20 K40 P40, T5 = S20+20 N20 K40 P40, and T6 = S20+20 N20+20 K 40 P40. 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.

Keywords

ATP-sulfurylase, Nitrate reductase, Nitrogen, Psoralea corylifolia L., Seed yield, Sulfur

Publication Date

6-30-2007

Publication Title

Journal of Plant Biology

ISSN

12269239

Volume

50

Issue

3

First Page

351

Last Page

357

Digital Object Identifier (DOI)

10.1007/BF03030666

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