scholarly journals Evaluating Growth and Photosynthesis of Kimchi Cabbage According to Extreme Weather Conditions

Agronomy ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1846
Author(s):  
Seung Hwan Wi ◽  
Hee Ju Lee ◽  
Sewoong An ◽  
Sung Kyeom Kim
Keyword(s):  
Net Photosynthetic Rate ◽  
Air Temperature ◽  
Photosynthetic Rate ◽  
Extreme Temperature ◽  
Extreme Weather ◽  
High Temperature Treatment ◽  
Growth Stages ◽  
Temperature Conditions ◽  
Extreme High Temperature ◽  
Gas Exchange System

The aim of this study was to develop and validate growth and photosynthetic models of Kimchi cabbages under extreme temperature conditions at different growth stages. Kimchi cabbage plants were subjected to low and high air temperatures 7–10 days after transplanting (DAT) and 40–43 DAT using extreme weather simulators. Except during these periods, the air temperature, relative humidity, solar radiation, and precipitation were set according to previous meteorological data. The experiments were performed over two years: in the first year, data were used to develop the models; the second-year experimental data were used for validation. The growth parameters and relative growth rate of Kimchi cabbage decreased due to low and high air temperature treatments. Photosynthetic CO2 response curves, which were measured using a portable gas exchange system, were used to calculate three biochemical parameters from measured data: photochemical efficiency, carboxylation conductance, and dark respiration. These parameters were used to develop the photosynthetic models (modified Thornley’s models) representing predictions of net photosynthetic rate by CO2 concentration and growth stage. The simulated photosynthetic rate with extreme high temperature treatment (35/31 °C) was 19.7 μmol m−2 s−1 which was evaluated approximately 3% deduction compared with control. Results of this study indicate that the growth and photosynthetic models developed here could be applied to evaluate retarded growth and net photosynthetic rate under extreme temperature conditions.

Effect of eco-physiological factors on the net photosynthetic rate ofUlmus pumilaat various growth stages

2016 ◽  
Vol 36 (6) ◽  
Author(s):  
赵宏瑾 ZHAO Hongjin ◽  
朱仲元 ZHU Zhongyuan ◽  
王喜喜 WANG Xixi ◽  
宋小园 SONG Xiaoyuan ◽  
王辉 WANG Hui ◽  
...  
Keyword(s):  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Growth Stages ◽  
Physiological Factors

Amelioration of extreme temperature stress in alfalfa seedlings by vitamin C and vitamin B6

2012 ◽  
Vol 60 (1) ◽  
pp. 57-70
Author(s):  
A. Hamada ◽  
A. Metwally ◽  
R. El-Shazoly
Keyword(s):  
Ascorbic Acid ◽  
Seed Germination ◽  
Temperature Stress ◽  
Respiration Rate ◽  
Extreme Temperature ◽  
Early Growth ◽  
High Yield ◽  
Soluble Carbohydrates ◽  
Growth Stages ◽  
Temperature Conditions

Concerns about the vulnerability of agricultural production to climate change are increasing. The establishment of seedlings at early growth stages of crop plants, one of the most important determinants of high yield, is severely affected by extreme temperatures. Therefore, efforts must be made to achieve high germination rate and vigorous early growth under extreme temperature conditions.Alfalfa is a perennial forage crop with high yield, good quality and high protein content, but is frequently exposed to extreme temperature conditions. The primary purpose of this investigation was to test the hypothesis that L-ascorbic acid (AsA) and pyridoxine (B6) pretreatment can completely or partially alleviate the effect of extreme temperature stress on seed germination and other physiological activities of alfalfa seedlings. Such treatment could be of importance for the establishment of alfalfa seedlings under temperature conditions colder or hotter than the optimum.Several parameters were studied in alfalfa seedlings primed before germination with 50 ppm ascorbic acid or 50 ppm pyridoxine for 6 h and then subjected to various temperatures (10, 15, 20, 25, 30, 35 and 40°C) for 7 days.The germination percentage of alfalfa seeds was negatively affected by extreme temperature. The vitamin treatments failed to alleviate the depressive effect of extreme temperature stress on seed germination. Extreme temperature also induced a reduction in the growth, total water content and respiration rate of alfalfa seedlings. Seed soaking in vitamins modified the stress-induced changes in respiration rate and growth criteria. Temperatures above or below the optimum stimulated the accumulation of soluble carbohydrates in alfalfa seedlings. Treatment with AsA or B6 partially or completely retarded the stimulatory effects of extreme temperature on soluble carbohydrate accumulation in the seedlings except in the case of 40 °C, where a significant stimulation was detected. However, extreme temperature stress and its interactive effects with AsA or B6 induced an inhibitory effect on the accumulation of free amino acids and soluble proteins in the test seedlings.

Diurnal variation in net photosynthetic rate and influencing environmentalfactors of Elaeagnus mollis Diels leaf

2009 ◽  
Vol 17 (3) ◽  
pp. 474-478
Author(s):  
Qun-Long LIU ◽  
Chan-Juan NING ◽  
Duo WANG ◽  
Guo-Liang WU ◽  
Hong-Mei ZHANG ◽  
...  
Keyword(s):  
Diurnal Variation ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Elaeagnus Mollis

Study on the environmental adaptability of lithium-ion battery powered UAV under extreme temperature conditions

Energy ◽  
2021 ◽  
Vol 219 ◽  
pp. 119481
Author(s):  
Niansi Li ◽  
Xiaoyong Liu ◽  
Bendong Yu ◽  
Liang Li ◽  
Jianqiang Xu ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Extreme Temperature ◽  
Lithium Ion ◽  
Temperature Conditions ◽  
Environmental Adaptability

Wood/polyimide composite via a rapid substitution compositing method for extreme temperature conditions

2021 ◽  
Vol 207 ◽  
pp. 108698
Author(s):  
Ku Ren ◽  
Qinqin Xia ◽  
Yongzhuang Liu ◽  
Wanke Cheng ◽  
Ying Zhu ◽  
...  
Keyword(s):  
Extreme Temperature ◽  
Temperature Conditions

scholarly journals Changes in peanut canopy structure and photosynthetic characteristics induced by an arbuscular mycorrhizal fungus in a nutrient-poor environment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yinli Bi ◽  
Huili Zhou
Keyword(s):  
Net Photosynthetic Rate ◽  
Leaf Area ◽  
Photosynthetic Rate ◽  
Mycorrhizal Fungus ◽  
Canopy Structure ◽  
Arbuscular Mycorrhizal ◽  
Photosynthetic Characteristics ◽  
Total Leaf Area ◽  
Tiller Angle ◽  
Amf Inoculation

AbstractA well-developed canopy structure can increase the biomass accumulation and yield of crops. Peanut seeds were sown in a soil inoculated with an arbuscular mycorrhizal fungus (AMF) and uninoculated controls were also sown. Canopy structure was monitored using a 3-D laser scanner and photosynthetic characteristics with an LI-6400 XT photosynthesis system after 30, 45 and 70 days of growth to explore the effects of the AMF on growth, canopy structure and photosynthetic characteristics and yield. The AMF colonized the roots and AMF inoculation significantly increased the height, canopy width and total leaf area of the host plants and improved canopy structure. AMF reduced the tiller angle of the upper and middle canopy layers, increased that of the lower layer, reduced the leaf inclination of the upper, middle and lower layers, and increased the average leaf area and leaf area index after 45 days of growth, producing a well-developed and hierarchical canopy. Moreover, AMF inoculation increased the net photosynthetic rate in the upper, middle and lower layers. Plant height, canopy width, and total leaf area were positively correlated with net photosynthetic rate, and the inclination angle and tiller angle of the upper leaves were negatively correlated with net photosynthetic rate. Overall, the results demonstrate the effects of AMF inoculation on plant canopy structure and net photosynthetic rate.

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