Citation
Yap W. S., . and Maziah M., . and Abdullah M. P., . and Abdullah Md. Zain, . (2004) Nitrogen assimilating enzymes and rubisco activity in the seedlings of rice cultivars. [Proceedings Paper]
Abstract
Nitrogen N is a costly and limiting element in plant growth. The processes that govern N fluxes particularly N uptake and distribution in crops is of major importance with respect to the environmental concerns and the quality of crop products. Investigation was made to determine the best cultivar that could assimilate both nitrogen and carbon dioxide effectively. Seedlings of fifteen rice cultivars Setanjung Muda MR 84 RU2242-1-1 IR 64 MR 185 MR 151 MR 159 MR 167 MRQ 34 MR 207 MR 209 MR 211 MR 219 and MR 220 were analyzed for enzymes activity of nitrate reductase NR nitrite reductase NiR glutamine synthetase GS glutamate synthase GOGAT glutamate dehydrogenase GDH and ribulose 1 5 bisphosphate carboxylase Rubisco. NR activity per plant was highest in cultivars MR 159 and MR 167 with 16.80nmol/min and 15.79nmol/min respectively whereas cultivar MRQ 34 exhibited the highest NiR activity per plant with 10.39nmol/min. Both NR and NiR enzymes are of great importance as they incorporated nitrate into ammonium which is the first step of nitrogen assimilation in plants. Cultivar Setanjung 0.70mol/min showed the highest GS activity per plant followed by MR 151 0.46mol/min. GOGAT and GDH activities per plant were highest in cultivars Muda 136.61nmol/min and MR 167 l65.92nmol/min respectively. Rubisco activity per plant was highest in cultivars Setanjung 517.28nmol/min MRQ 34 492.20nmol/min and MR 220 466.34nmol/min. None of the cultivars above showed an outstanding correlation between N assimilating enzymes and Rubisco activity. Further evaluation was needed to clarify a deeper understanding between the involvements of N assimilating enzymes and carbon metabolizing enzymes.
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Abstract
Nitrogen N is a costly and limiting element in plant growth. The processes that govern N fluxes particularly N uptake and distribution in crops is of major importance with respect to the environmental concerns and the quality of crop products. Investigation was made to determine the best cultivar that could assimilate both nitrogen and carbon dioxide effectively. Seedlings of fifteen rice cultivars Setanjung Muda MR 84 RU2242-1-1 IR 64 MR 185 MR 151 MR 159 MR 167 MRQ 34 MR 207 MR 209 MR 211 MR 219 and MR 220 were analyzed for enzymes activity of nitrate reductase NR nitrite reductase NiR glutamine synthetase GS glutamate synthase GOGAT glutamate dehydrogenase GDH and ribulose 1 5 bisphosphate carboxylase Rubisco. NR activity per plant was highest in cultivars MR 159 and MR 167 with 16.80nmol/min and 15.79nmol/min respectively whereas cultivar MRQ 34 exhibited the highest NiR activity per plant with 10.39nmol/min. Both NR and NiR enzymes are of great importance as they incorporated nitrate into ammonium which is the first step of nitrogen assimilation in plants. Cultivar Setanjung 0.70mol/min showed the highest GS activity per plant followed by MR 151 0.46mol/min. GOGAT and GDH activities per plant were highest in cultivars Muda 136.61nmol/min and MR 167 l65.92nmol/min respectively. Rubisco activity per plant was highest in cultivars Setanjung 517.28nmol/min MRQ 34 492.20nmol/min and MR 220 466.34nmol/min. None of the cultivars above showed an outstanding correlation between N assimilating enzymes and Rubisco activity. Further evaluation was needed to clarify a deeper understanding between the involvements of N assimilating enzymes and carbon metabolizing enzymes.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. QK710.2 M239 2004 Call Number |
| AGROVOC Term: | Seeds |
| AGROVOC Term: | Rice |
| AGROVOC Term: | Cultivars |
| AGROVOC Term: | Seedlings |
| AGROVOC Term: | Assimilation |
| AGROVOC Term: | Carbon dioxide |
| AGROVOC Term: | Nitrogen |
| AGROVOC Term: | Rubisco |
| AGROVOC Term: | Enzymes |
| AGROVOC Term: | Leaves |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 05:15 |
| URI: | http://webagris.upm.edu.my/id/eprint/12823 |
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