Growth responses of rice in ammonium-based nutrient solution with variable calcium supply |
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| Authors: | F J M Sung W S Lo |
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| Institution: | (1) Department of Agronomy National Chung Hsing University Taichung, 40227, Taiwan, ROC |
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| Abstract: | It is commonly known that calcium promotes NO3
- uptake in many crop species. However, calcium enhancement of NH4
+ uptake by plants has received little attention. This study aimed to evaluate the effect of Ca supplements on NH4
+ uptake and plant growth in solution cultured rice. Supplemental Ca applied at vegetative and reproductive phases of plant
ontogeny tended to stimulate NH4
+ absorption, and accordingly resulted in a better straw and grain yield. However, excessively supplied Ca (400 ppm) was detrimental
to plant growth. Increases in straw and grain yield observed at Ca levels up to 300 ppm were linked to the Ca-enhanced activities
of glutamine synthetase (GS), glutamate synthase (GOGAT), and ribulose 1, 5-bisphosphate carboxylase/oxygenase (Rubisco). |
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| Keywords: | ammonium calcium CO2 exchange rate GS/GOGAT rice rubisco |
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