scholarly journals Interactive effects of nitrate-ammonium ratios and temperatures on growth, photosynthesis, and nitrogen metabolism of tomato seedlings

2017 ◽  
Vol 214 ◽  
pp. 41-50 ◽  
Author(s):  
Guoying Liu ◽  
Qingjie Du ◽  
Jianming Li
Keyword(s):  
Nitrogen Metabolism ◽  
Interactive Effects ◽  
Tomato Seedlings

Nitrogen metabolism in tomato seedlings

1985 ◽  
Vol 85 (3) ◽  
pp. 403-411 ◽  
Author(s):  
Y. M. S. Maghrabi ◽  
A. E. Younis ◽  
F. S. Abozinah
Keyword(s):  
Nitrogen Metabolism ◽  
Tomato Seedlings

scholarly journals Beneficial Role of Exogenous Spermidine on Nitrogen Metabolism in Tomato Seedlings Exposed to Saline-alkaline Stress

2013 ◽  
Vol 138 (1) ◽  
pp. 38-49 ◽  
Author(s):  
Yi Zhang ◽  
Xiao-Hui Hu ◽  
Yu Shi ◽  
Zhi-Rong Zou ◽  
Fei Yan ◽  
...  
Keyword(s):  
Plant Growth ◽  
Nitrogen Metabolism ◽  
Glutamate Synthase ◽  
Differential Sensitivity ◽  
Nitrate Content ◽  
Alkaline Stress ◽  
Metabolic Disturbances ◽  
Tomato Seedlings ◽  
Exogenous Spermidine

We studied the effects of exogenous spermidine (Spd) on plant growth and nitrogen metabolism in two cultivars of tomato (Solanum lycopersicum) that have differential sensitivity to mixed salinity-alkalinity stress: ‘Jinpeng Chaoguan’ (salt-tolerant) and ‘Zhongza No. 9’ (salt-sensitive). Seedling growth of both tomato cultivars was inhibited by salinity-alkalinity stress, but Spd treatment alleviated the growth reduction to some extent, especially in ‘Zhongza No. 9’. Exogenous Spd may help reduce stress-induced increases in free amino acids, ammonium (NH4+) contents, and NADH-dependent glutamate dehydrogenase (NADH-GDH) activities; depress stress-induced decreases in soluble protein and nitrate content; and depress nitrate reductase, nitrite reductase, glutamine synthetase (GS), NADH-dependent glutamate synthase (NADH-GOGAT), glutamate oxaloacetate transaminase (GOT), and glutamate pyruvate transaminase (GPT) activities, especially for ‘Zhongza No. 9’. Based on our results, we suggest that exogenous Spd promotes the assimilation of excess toxic NH4+ by coordinating and strengthening the synergistic action of NADH-GDH, GS/NADH-GOGAT, and transamination pathways, all during saline-alkaline stress. Subsequently, NH4+ and its related enzymes (GDH, GS, GOGAT, GOT, and GPT), in vivo, are maintained in a proper and balanced state to enable mitigation of stress-resulted damages. These results suggest that exogenous Spd treatment can relieve nitrogen metabolic disturbances caused by salinity-alkalinity stress and eventually promote plant growth.

Kinetin Regulates UV-B-Induced Damage to Growth, Photosystem II Photochemistry, and Nitrogen Metabolism in Tomato Seedlings

2017 ◽  
Vol 37 (1) ◽  
pp. 233-245 ◽  
Author(s):  
Gausiya Bashri ◽  
Madhulika Singh ◽  
Rohit Kumar Mishra ◽  
Jitendra Kumar ◽  
Vijay Pratap Singh ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Nitrogen Metabolism ◽  
Tomato Seedlings ◽  
Photosystem Ii Photochemistry

Interactive effects of selection for lower backfat and dietary pyridoxine levels on reproduction, and nutrient metabolism during the gestation period in Yorkshire and Hampshire sows

1998 ◽  
Vol 78 (2) ◽  
pp. 167-173 ◽  
Author(s):  
T. E. N. Knights ◽  
R. R. Grandhi ◽  
S. K. Baidoo
Keyword(s):  
Key Words ◽  
Nitrogen Metabolism ◽  
Litter Size ◽  
Reproductive Performance ◽  
Positive Influence ◽  
Interactive Effects ◽  
Gestation Period ◽  
Nutrient Metabolism ◽  
Selection For

Two experiments were conducted to determine the interactive effects of selection for lower backfat over six generations, and two dietary supplemental pyridoxine levels (1.0 vs. 15.0 ppm) on sow reproductive performance and nutrient metabolism in second-parity Yorkshire and Hampshire sows. Feeding increased pyridoxine at 16.0 vs. 2.6 ppm from day of weaning through gestation did not improve (P > 0.05) the sow reproductive performance in experiment 1 (N = 32) or 2 (N = 66). In exp. 2, feeding increased pyridoxine reduced the weaning to estrus interval (4.6 vs. 5.7 d, P = 0.11). It also increased the average daily apparent retention of nitrogen during gestation in both experiments 1 (17.2 vs. 7.8 g, P = 0.11) and 2 (10.5 vs. 5.0 g, P = 0.10). Sows fed increased pyridoxine had higher (P < 0.01) plasma pyridoxal and pyridoxic acid levels throughout the gestation period. The overall results indicate that increased dietary pyridoxine tended to have a positive influence on sow weaning to estrus interval and nitrogen metabolism, and it also tended to have a positive influence on litter size only in Yorkshire select line of sows. Key words: Breed, line, sows, pyridoxine, reproduction, metabolism

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