Growth and physiological responses of Picea asperata seedlings to elevated temperature and to nitrogen fertilization

2008 ◽  
Vol 31 (1) ◽  
pp. 163-173 ◽  
Author(s):  
Chunzhang Zhao ◽  
Qing Liu
Keyword(s):  
Elevated Temperature ◽  
Nitrogen Fertilization ◽  
Physiological Responses ◽  
Picea Asperata

scholarly journals High Nitrogen Fertilization Modulates Morpho-Physiological Responses, Yield, and Water Productivity of Lowland Rice under Deficit Irrigation

Agronomy ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1291
Author(s):  
Nasr M. Abdou ◽  
Mohamed A. Abdel-Razek ◽  
Shimaa A. Abd El-Mageed ◽  
Wael M. Semida ◽  
Ahmed A. A. Leilah ◽  
...  
Keyword(s):  
Nitrogen Fertilizer ◽  
Irrigation Water ◽  
Nitrogen Fertilization ◽  
Deficit Irrigation ◽  
Physiological Responses ◽  
Water Productivity ◽  
Water Shortage ◽  
Rice Production ◽  
Lowland Rice ◽  
Nitrogen Fertilizers

Sustainability of rice production under flooding conditions has been challenged by water shortage and food demand. Applying higher nitrogen fertilization could be a practical solution to alleviate the deleterious effects of water stress on lowland rice (Oryza sativa L.) in semi-arid conditions. For this purpose, field experiments were conducted during the summer of 2017 and 2018 seasons. These trials were conducted as split-split based on randomized complete blocks design with soil moisture regimes at three levels (120, 100 and 80% of crop evapotranspiration (ETc), nitrogen fertilizers at two levels (N1—165 and N2—200 kg N ha−1) and three lowland Egyptian rice varieties [V1 (Giza178), V2 (Giza177) and V3 (Sakha104)] using three replications. For all varieties, growth (plant height, tillers No, effective tillers no), water status ((relative water content RWC, and membrane stability index, MSI), physiological responses (chlorophyll fluorescence, Relative chlorophyll content (SPAD), and yield were significantly increased with higher addition of nitrogen fertilizer under all water regimes. Variety V1 produced the highest grain yield compared to other varieties and the increases were 38% and 15% compared with V2 and V3, respectively. Increasing nitrogen up to 200 kg N ha−1 (N2) resulted in an increase in grain and straw yields by 12.7 and 18.2%, respectively, compared with N1. The highest irrigation water productivity (IWP) was recorded under I2 (0.89 kg m−3) compared to (0.83 kg m−3) and (0.82 kg m−3) for I1 and I3, respectively. Therefore, the new applied agro-management practice (deficit irrigation and higher nitrogen fertilizer) effectively saved irrigation water input by 50–60% when compared with the traditional cultivation method (flooding system). Hence, the new proposed innovative method for rice cultivation could be a promising strategy for enhancing the sustainability of rice production under water shortage conditions.

scholarly journals Hot and bothered: effects of elevated Pco2 and temperature on juvenile freshwater mussels

2018 ◽  
Vol 315 (1) ◽  
pp. R115-R127 ◽  
Author(s):  
Jennifer D. Jeffrey ◽  
Kelly D. Hannan ◽  
Caleb T. Hasler ◽  
Cory D. Suski
Keyword(s):  
Elevated Temperature ◽  
Freshwater Mussels ◽  
Physiological Responses ◽  
Environmental Stressors ◽  
Interactive Effects ◽  
Mrna Levels ◽  
Acid Base ◽  
Consumption Rates ◽  
The Individual ◽  
Measured Exposure

Multiple environmental stressors may interact in complex ways to exceed or diminish the impacts of individual stressors. In the present study, the interactive effects of two ecologically relevant stressors [increased temperature and partial pressure of carbon dioxide (Pco2)] were assessed for freshwater mussels, a group of organisms that are among the most sensitive and rapidly declining worldwide. The individual and combined effects of elevated temperature (22°C–34°C) and Pco2 (~230, 58,000 µatm) on juvenile Lampsilis siliquoidea were quantified over a 5- or 14-day period, during which physiological and whole animal responses were measured. Exposure to elevated temperature induced a series of physiological responses, including an increase in oxygen consumption rates following 5 days of exposure at 31°C and an increase in carbonic anhydrase ( ca) and heat shock protein 70 mRNA levels following 14 days of exposure at 28°C and 34°C, respectively. Treatment with elevated Pco2 activated acid-base regulatory responses including increases in CA and Na+-K+-ATPase activity and a novel mechanism for acid-base regulation during Pco2 exposure in freshwater mussels was proposed. Thermal and CO2 stressors also interacted such that responses to the thermal stressor were diminished in mussels exposed to elevated Pco2, resulting in the greatest level of mortality. Additionally, larger mussels were more likely to survive treatment with elevated Pco2 and/or temperature. Together, exposure to elevated Pco2 may compromise the ability of juvenile freshwater mussels to respond to additional stressors, such as increased temperatures, highlighting the importance of considering not only the individual but also the interactive effects of multiple environmental stressors.

Belowground responses of Picea asperata seedlings to warming and nitrogen fertilization in the eastern Tibetan Plateau

2011 ◽  
Vol 26 (3) ◽  
pp. 637-648 ◽  
Author(s):  
Qing Liu ◽  
Huajun Yin ◽  
Jinsong Chen ◽  
Chunzhang Zhao ◽  
Xinying Cheng ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Nitrogen Fertilization ◽  
Eastern Tibetan Plateau ◽  
Picea Asperata

scholarly journals Physiological responses to elevated temperature across the geographic range of a terrestrial salamander

2018 ◽  
Vol 221 (18) ◽  
pp. jeb178236 ◽  
Author(s):  
Alexander J. Novarro ◽  
Caitlin R. Gabor ◽  
Cory B. Goff ◽  
Tori D. Mezebish ◽  
Lily M. Thompson ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Physiological Responses ◽  
Geographic Range

scholarly journals Nitrogen Fertilization and Liming Improves Growth, Production, Gas Exchange and Post-Harvest Quality of Yellow Flower Jambu

2020 ◽  
Vol 8 (3) ◽  
pp. 756
Author(s):  
Vivian Christine Nascimento Costa ◽  
Mário Lopes da Silva Júnior ◽  
Italo Marlone Gomes Sampaio ◽  
Ricardo Falesi Palha de Moraes Bittencourt ◽  
Stefany Priscila Reis Figueiredo ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Nitrogen Fertilization ◽  
Physiological Responses ◽  
Biomass Accumulation ◽  
Titratable Acidity ◽  
Production Performance ◽  
Soluble Solids ◽  
Post Harvest ◽  
Growth Production

Jambu is a vegetable, widely consumed in the Brazilian North Region, both in typical foods and medicinal herb. Despite its versatility, there are uncountable challenges in relation to its cultivation, especially with regard to the availability of information on nutritional management, such as the lack of data on the effect of liming associated with the supply of nitrogen (N) on the production performance of the crop. Thus, the effect of nitrogen fertilization and liming on growth, production, physiological responses and post-harvest quality of the yellow-flowered variety jambu was evaluated. The experimental design was randomized in factorial blocks (6 x 2), with five repetitions. The treatments consisted in the combination of six doses of N (0; 60; 90; 120; 150 and 180 kg ha-1) with and without liming application (0 and 70% V). The variables of growth, production, gas exchange and post-harvest quality of jambu were evaluated. Standardly, there was interaction between N-dose and liming factors for most of the analyzed variables, except for titratable acidity and total soluble solids and titratable acidity ratio. In general, the increasing of N doses combined with liming positively affected growth, production, physiological responses and post-harvest quality, and it was observed that in the 170 kg ha-1 dose of N higher response was obtained in the biomass accumulation of the aerial part and in the 180 kg ha-1 dose of N maximum production of inflorescences. Therefore, the use of correctives associated with nitrogen fertilization is recommended to obtain more significant production and quality of jambu.

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