Study on the Diurnal Changes of Net Photosynthetic Rate and the Impact Factors of Stevia rebaudiana Bertoni in Autumn

The effects of potassium fertilizer on diurnal change of photosynthesis in Stevia rebaudiana Bertoni had been studied. Diurnal changes of net photosynthetic rate (Pn) and environmental and physiological traits in leaves of Stevia rebaudiana Bertoni were measured using LI-6400 portable photosynthesis system. The results showed that optimal potassium fertilizer can increased chlorophyll content and improved photosynthesis rate and decreased the chlorophyll a/b ratio. At the same time, midday depression of photosynthesis abated or disappeared.

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Diurnal changes in net photosynthetic rate of Pueraria lobata and its impact factors

Forestry Studies in China ◽

10.1007/s11632-011-0107-9 ◽

2011 ◽

Vol 13 (1) ◽

pp. 57-63

Author(s):

You-fang Ding ◽

Cai-yun Wang ◽

Neo C. Mokgolodi ◽

Xiao-xia Zhang ◽

Ling-ling Shi ◽

...

Keyword(s):

Net Photosynthetic Rate ◽

Photosynthetic Rate ◽

Impact Factors ◽

Pueraria Lobata ◽

Diurnal Changes

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The impact of floating dust on net photosynthetic rate of Populus euphratica in early spring, at Zepu, northwestern China

10.7287/peerj.preprints.3452 ◽

2017 ◽

Author(s):

Zhiguo XUE ◽

Zhenxing SHEN ◽

Wei HAN ◽

Shanyang XU ◽

Xiaohua MA ◽

...

Keyword(s):

Plant Growth ◽

Net Photosynthetic Rate ◽

Photosynthetic Rate ◽

Populus Euphratica ◽

Early Spring ◽

Northwestern China ◽

Natural Phenomenon ◽

Stomatal Limitation ◽

Dust Weather ◽

The Impact

Floating dust weather is an annual natural phenomenon in early spring in south of Xinjiang UygurAutonomous Region, northwestern China. Floating dust in air can influence human health and plant growth. Populus euphratica is a rare tree species which can grow in hot and dry conditions. Some investigations have evaluated the effect of floating dust on plants by means of artificial dust to which simulates the natural sand and dust, but the mechanism by which plants respond to sand is poorly understood. The investigation presented in this paper focused on a comparison of the variation in net photosynthetic rate (Pn) before and during floating dust weather, to elucidate the mechanisms involved. Stomatal conductance (gs) and Pn appeared to increase during floating dust weather;in contrast, stomatal limitation (Ls) and non-stomatal limitation (Lns) decreased with photosynthetic active radiation in the range 500 to 2000 μmol m−2s−1,which is optimum for plant growth. Aerosol ions, including potassium, dissolved in water collected by foliar structures or tender stems, may come into contact with intercellular stroma and improve chloroplast activity or ribulose-1,5-bisphosphate carboxylase/ oxygenase (Rubisco) levels, such as potassium, thereby influencing Ls and Lns. Moreover, potassium, phosphorus, nitrogen and sodium in aerosols appeared to increase Pn, and this may be due to nutrient compounds in aerosols, which may have a similar effect to spraying fertilizer on leaves. In addition, the high relative humidity and carbon dioxide concentration in air during floating dust weather may facilitate an increase in Pn.

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Relationship Between Diurnal Changes of Net Photosynthetic Rate and Influencing Factors in Rice under Saline Sodic Stress

Rice Science ◽

10.1016/s1672-6308(08)60029-3 ◽

2008 ◽

Vol 15 (2) ◽

pp. 119-124 ◽

Cited By ~ 9

Author(s):

Fu Yang ◽

Zheng-wei Liang ◽

Zhi-chun Wang ◽

Yuan Chen

Keyword(s):

Net Photosynthetic Rate ◽

Influencing Factors ◽

Photosynthetic Rate ◽

Diurnal Changes

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Study on characteristics of net photosynthetic rate of two kinds of tree shape and Impact Factors in Korla fragrant pear

Acta Ecologica Sinica ◽

10.5846/stxb201304130700 ◽

2013 ◽

Vol 33 (18) ◽

pp. 5565-5573 ◽

Cited By ~ 1

Author(s):

孙桂丽 SUN Guili ◽

徐敏 XU Min ◽

李疆 LI Jiang ◽

梅闯 MEI Chuang

Keyword(s):

Net Photosynthetic Rate ◽

Photosynthetic Rate ◽

Impact Factors ◽

Tree Shape

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Photosynthetic Product Allocations to the Organs of Pinus massoniana Are Not Affected by Differences in Synthesis or Temporal Variations in Translocation Rates

Forests ◽

10.3390/f12040471 ◽

2021 ◽

Vol 12 (4) ◽

pp. 471

Author(s):

Xiuxiu Deng ◽

Zheng Shi ◽

Lixiong Zeng ◽

Lei Lei ◽

Xuebing Xin ◽

...

Keyword(s):

Net Photosynthetic Rate ◽

Photosynthetic Rate ◽

Co2 Concentration ◽

Pinus Massoniana ◽

Temporal Variations ◽

Mean Value ◽

Diurnal Changes ◽

13C Pulse Labeling ◽

Pinus Massoniana Lamb ◽

Photosynthetic Products

Photosynthesis and the allocation of photosynthetic products are the two main factors that determine plant growth. To understand the growth and productivity of Pinus massoniana Lamb., the diurnal changes in photosynthetic rate were continuously monitored. Furthermore, the translocation and allocation of the photosynthetic products synthesized in the morning and afternoon were explored using 13C pulse labeling. The results showed that: (1) on sunny days, the diurnal variation of the net photosynthetic rate showed a “double peak” curve, with an obvious “a depression” when temperatures were highest and humidity lowest. On cloudy days, it showed an irregular “jagged” curve, which was curve consistent with the variations in photosynthetically active radiation (PAR). Meanwhile, the photosynthetic rate changed with the transient changes in environmental factors such as PAR, temperature, and humidity. (2) The mean value of the net photosynthetic rate in the morning was higher than in the afternoon, and the response of the net photosynthetic rate to environmental change (PAR, temperature, humidity, and CO2 concentration) in the morning was greater than that in the afternoon. (3) The translocation of photosynthetic products synthesized in the afternoon was faster than that in the morning. Shortly after synthesis of photosynthetic products, the translocation of products synthesized in the morning tended toward upper organs (including current-year leaves and 1-year leaves), while the translocation of products synthesized in the afternoon decreased in the upper organs. However, after 15 days of 13C pulse labeling, the allocation of the photosynthetic products synthesized in the morning and afternoon tended to be the same. These results indicate that the differences in the photosynthetic products synthesized and the temporal differences in the translocation rates did not affect the final allocation of the photosynthetic products in the various organs of the P. massoniana. These results improve our knowledge of the functional phases of P. massoniana during the diurnal cycle.

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The impact of floating dust on net photosynthetic rate of Populus euphratica in early spring, at Zepu, northwestern China

10.7287/peerj.preprints.3452v1 ◽

2017 ◽

Author(s):

Zhiguo XUE ◽

Zhenxing SHEN ◽

Wei HAN ◽

Shanyang XU ◽

Xiaohua MA ◽

...

Keyword(s):

Plant Growth ◽

Net Photosynthetic Rate ◽

Photosynthetic Rate ◽

Populus Euphratica ◽

Early Spring ◽

Northwestern China ◽

Natural Phenomenon ◽

Stomatal Limitation ◽

Dust Weather ◽

The Impact

Floating dust weather is an annual natural phenomenon in early spring in south of Xinjiang UygurAutonomous Region, northwestern China. Floating dust in air can influence human health and plant growth. Populus euphratica is a rare tree species which can grow in hot and dry conditions. Some investigations have evaluated the effect of floating dust on plants by means of artificial dust to which simulates the natural sand and dust, but the mechanism by which plants respond to sand is poorly understood. The investigation presented in this paper focused on a comparison of the variation in net photosynthetic rate (Pn) before and during floating dust weather, to elucidate the mechanisms involved. Stomatal conductance (gs) and Pn appeared to increase during floating dust weather;in contrast, stomatal limitation (Ls) and non-stomatal limitation (Lns) decreased with photosynthetic active radiation in the range 500 to 2000 μmol m−2s−1,which is optimum for plant growth. Aerosol ions, including potassium, dissolved in water collected by foliar structures or tender stems, may come into contact with intercellular stroma and improve chloroplast activity or ribulose-1,5-bisphosphate carboxylase/ oxygenase (Rubisco) levels, such as potassium, thereby influencing Ls and Lns. Moreover, potassium, phosphorus, nitrogen and sodium in aerosols appeared to increase Pn, and this may be due to nutrient compounds in aerosols, which may have a similar effect to spraying fertilizer on leaves. In addition, the high relative humidity and carbon dioxide concentration in air during floating dust weather may facilitate an increase in Pn.

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High Tunnel Coverings Alter Crop Productivity and Microclimate of Tomato and Lettuce

HortScience ◽

10.21273/hortsci16208-21 ◽

2022 ◽

Vol 57 (2) ◽

pp. 265-272

Author(s):

Kelly M. Gude ◽

Eleni D. Pliakoni ◽

Brianna Cunningham ◽

Kanwal Ayub ◽

Qing Kang ◽

...

Keyword(s):

Net Photosynthetic Rate ◽

Photosynthetic Rate ◽

Crop Productivity ◽

Full Spectrum ◽

High Tunnel ◽

High Tunnels ◽

Soil Temperatures ◽

Subsequent Crop ◽

Leaf Lettuce ◽

The Impact

The implementation of high tunnels has shown to increase marketability and/or yield of tomato (Solanum lycopersicum) and lettuce (Lactuca sativa) crops compared with open-field systems. These structures provide the opportunity to alter light intensity and spectral quality by using specific polyethylene (poly) films and/or shadecloth, which may affect microclimate and subsequent crop productivity. However, little is known about how specific high tunnel coverings affect these parameters. The overall goal of this study was to evaluate the impact of various high tunnel coverings on the microclimate and crop productivity of tomato and lettuce. The coverings included standard, ultraviolet (UV)-stabilized poly film (standard); diffuse poly (diffuse); full-spectrum clear poly (clear); UV-A/B blocking poly (block); standard + 55% shadecloth (shade); and removal of standard poly 2 weeks before initial harvest to simulate a movable tunnel (movable). Microclimate parameters that were observed included canopy and soil temperatures, canopy growing degree-days (GDD), and photosynthetic active radiation (PAR), and crop productivity included yield and net photosynthetic rate. Hybrid red ‘BHN 589’ tomatoes were grown during the summer, and red ‘New Red Fire’ and green ‘Two Star’ leaf lettuce were grown in both spring and fall in 2017 and 2018. Increased temperature, GDD, and PAR were observed during the spring and summer compared with the fall. The soil temperatures during the summer increased more under the clear covering compared with the others. For tomato, the shade produced lower total fruit yield and net photosynthetic rate (Pn) compared with the other treatments, which were similar (P < 0.001 and <0.001, respectively). The greatest yield was 7.39 kg/plant, which was produced under the clear covering. For red leaf lettuce grown in the spring, the plants under the clear, standard, and diffuse coverings had significantly greater yield than the movable and shade coverings (P < 0.001). The coverings had less effect on the yield during the fall lettuce trials, which may have been attributed to the decrease in PAR and environmental temperatures. The findings of this study suggest that high tunnel coverings affect both microclimate and yield of lettuce and tomato.

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