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Physiological Investigation of the Impact of Nitrogen and Sulphur Application on Seed and Oil Yield of Rapeseed ( Brassica campestris L.) and Mustard ( Brassica juncea L. Czern. and Coss.) Genotypes

Physiological Investigation of the Impact of Nitrogen and Sulphur Application on Seed and Oil... Field experiments were conducted to determine the physiological basis of the effects of N and S interactions on seed and oil yield of Brassica species. Five combinations of N and S (in kg ha−1) 0S+100N (T1), 40S+60N (T2), 40S+100N (T3), 60S+100N (T4) and 60S+150N (T5), were used for this purpose. Nitrate reductase (NR) activity and ATP‐sulphurylase activity in the leaves were measured at various growth stages, as the two enzymes catalyse rate‐limiting steps of the assimilatory pathways of nitrate and sulphate, respectively. The activities of these enzymes were strongly correlated with seed and oil yield. The highest nitrate reductase activity, ATP‐sulphurylase activity and yield were achieved with the combination T3 in both species. Any variation from this combination decreased the activity of these enzymes, resulting in a reduction of the seed and oil yield of Brassica species. The higher seed and oil yield achieved in these species at T3 could be due to optimization of leaf soluble protein and photosynthetic rate, as these parameters are influenced by N and S assimilation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Agronomy and Crop Science Wiley

Physiological Investigation of the Impact of Nitrogen and Sulphur Application on Seed and Oil Yield of Rapeseed ( Brassica campestris L.) and Mustard ( Brassica juncea L. Czern. and Coss.) Genotypes

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Publisher
Wiley
Copyright
Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0931-2250
eISSN
1439-037X
DOI
10.1046/j.1439-037x.1999.00307.x
Publisher site
See Article on Publisher Site

Abstract

Field experiments were conducted to determine the physiological basis of the effects of N and S interactions on seed and oil yield of Brassica species. Five combinations of N and S (in kg ha−1) 0S+100N (T1), 40S+60N (T2), 40S+100N (T3), 60S+100N (T4) and 60S+150N (T5), were used for this purpose. Nitrate reductase (NR) activity and ATP‐sulphurylase activity in the leaves were measured at various growth stages, as the two enzymes catalyse rate‐limiting steps of the assimilatory pathways of nitrate and sulphate, respectively. The activities of these enzymes were strongly correlated with seed and oil yield. The highest nitrate reductase activity, ATP‐sulphurylase activity and yield were achieved with the combination T3 in both species. Any variation from this combination decreased the activity of these enzymes, resulting in a reduction of the seed and oil yield of Brassica species. The higher seed and oil yield achieved in these species at T3 could be due to optimization of leaf soluble protein and photosynthetic rate, as these parameters are influenced by N and S assimilation.

Journal

Journal of Agronomy and Crop ScienceWiley

Published: Jul 1, 1999

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