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Effect of nitrogen levels and leaf position on carbohydrate and nitrogen metabolism in FCV tobacco (Nicotiana tabacum L.)

Effect of nitrogen levels and leaf position on carbohydrate and nitrogen metabolism in FCV... Interplay of nitrogen and carbohydrate metabolism, which influenced by nitrogen nutrient management determines the quality and chemical composition of cured tobacco leaf. Tobacco variety Kanchan is grown in Northern light soils of Andhra Pradesh and is a high yielding variety showing response to higher levels of nitrogen. Effect of nitrogen (0, 40, 80, 120, 160 and 200 kg N ha−1) on nitrate reductase, nitrate accumulation and starch content in different leaf position of variety Kanchan was studied in pot (150 kg) culture with Northern light soil of Andhra Pradesh. The starch content decreased significantly with increase in application of nitrogen in three growth stages. But the maximum decrease in starch content was observed with increase in application of nitrogen from 120 to 160 kg N ha−1 in all leaf positions except in the top position. The in vivo nitrate reductase (NR) activity increased significantly with increase in leaf position from bottom to top and decreased with age of the plant from 50 to 70 days. Nitrate–N content increased from 0.14 mg g−1 dry wt. in the bottom leaves of control plants to 8.615 mg g−1 dry wt in the leaves of plants treated with 200 kg N ha−1. The nitrate content increased from bottom to top position in all treatments with increase in nitrogen application. Increased application of nitrogen increased the NR activity and accumulation of nitrate–N, thus a positive relationship was observed between NR activity and nitrate–N accumulation whereas starch content decreased with increased application of nitrogen. The negative relationship was observed between NR activity and starch accumulation and also between nitrate–N and starch. The recommendation of 120 kg N ha−1 for the variety Kanchan grown in northern light soils of Andhra Pradesh was found to be optimum as NR activity was at a par between 120 and 200 kg N ha−1 application at 60 and 70 days of growth. Thus NR activity may be taken as one of the indicators to the maturity of leaf and availability of nitrogen to the plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Indian Journal of Plant Physiology Springer Journals

Effect of nitrogen levels and leaf position on carbohydrate and nitrogen metabolism in FCV tobacco (Nicotiana tabacum L.)

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References (15)

Publisher
Springer Journals
Copyright
Copyright © 2014 by Indian Society for Plant Physiology
Subject
Life Sciences; Plant Sciences; Plant Physiology; Plant Ecology; Plant Biochemistry; Cell Biology; Plant Genetics & Genomics
ISSN
0019-5502
eISSN
0974-0252
DOI
10.1007/s40502-014-0107-6
Publisher site
See Article on Publisher Site

Abstract

Interplay of nitrogen and carbohydrate metabolism, which influenced by nitrogen nutrient management determines the quality and chemical composition of cured tobacco leaf. Tobacco variety Kanchan is grown in Northern light soils of Andhra Pradesh and is a high yielding variety showing response to higher levels of nitrogen. Effect of nitrogen (0, 40, 80, 120, 160 and 200 kg N ha−1) on nitrate reductase, nitrate accumulation and starch content in different leaf position of variety Kanchan was studied in pot (150 kg) culture with Northern light soil of Andhra Pradesh. The starch content decreased significantly with increase in application of nitrogen in three growth stages. But the maximum decrease in starch content was observed with increase in application of nitrogen from 120 to 160 kg N ha−1 in all leaf positions except in the top position. The in vivo nitrate reductase (NR) activity increased significantly with increase in leaf position from bottom to top and decreased with age of the plant from 50 to 70 days. Nitrate–N content increased from 0.14 mg g−1 dry wt. in the bottom leaves of control plants to 8.615 mg g−1 dry wt in the leaves of plants treated with 200 kg N ha−1. The nitrate content increased from bottom to top position in all treatments with increase in nitrogen application. Increased application of nitrogen increased the NR activity and accumulation of nitrate–N, thus a positive relationship was observed between NR activity and nitrate–N accumulation whereas starch content decreased with increased application of nitrogen. The negative relationship was observed between NR activity and starch accumulation and also between nitrate–N and starch. The recommendation of 120 kg N ha−1 for the variety Kanchan grown in northern light soils of Andhra Pradesh was found to be optimum as NR activity was at a par between 120 and 200 kg N ha−1 application at 60 and 70 days of growth. Thus NR activity may be taken as one of the indicators to the maturity of leaf and availability of nitrogen to the plants.

Journal

Indian Journal of Plant Physiology – Springer Journals

Published: Sep 3, 2014

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