Effects of Low Temperature and Light Stress on Gas Exchange and Chlorophyll Fluorescence of Pumpkin Seedlings

2012 ◽  
Vol 450-451 ◽  
pp. 537-542
Author(s):  
En Xiang Kang ◽  
Jun Jie Luo ◽  
Hui Zhen Qiu ◽  
Nian Lai Chen ◽  
Dan Su ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Low Temperature ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Evaporation Rate ◽  
Light Stress ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Photochemical Quenching ◽  
Intercellular Co2

Pumpkin（Cucubita pepo L.）seedlings were exposed under different low temperature-light regimes to investigate the responses of photosynthesis and chlorophyll fluorescence to the stress. The results indicated that the contents of chlorophyll increased at first day after treatment and then decreased under special temperature(15/5、20/10、25/15°C )and poor light(50、150、250μmol•m-2•s-1).The net photosynthetic rate, evaporation rate, stomata conductance and intercellular CO2 concentration increased one day after treatment and then decreased, stomata limitation increased above15/5°C special temperature and special poor light. However, under 15/5°C temperature and special poor light, the net photosynthetic rate, evaporation rate and stomata conductance decreased, and intercellular CO2 concentration increased stomata limitation increased in 4 days after treatment then decreased. Ft、Yield(F/Fm’)、qP decreased under special temperature and poor light.The change of these parameters were less under the light density of 50μmol•m-2•s-2 than other light densities, which means that poorer light reduced the sensitivity of pumpkin to low temperature and increased the photochemical activity of PS, but the photochemical quenching (qP) decreased and the non-photochemical quenching(qN) increased at the same time.

scholarly journals Photosynthesis, Chlorophyll Fluorescence, and Yield of Peanut in Response to Biochar Application

2021 ◽  
Vol 12 ◽  
Author(s):  
Shujun Wang ◽  
Junlin Zheng ◽  
Yujia Wang ◽  
Qingfeng Yang ◽  
Taotao Chen ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Leaf Gas Exchange ◽  
Photochemical Efficiency ◽  
Photochemical Quenching ◽  
Nitrogen Accumulation ◽  
Leaf Nitrogen Content ◽  
Chlorophyll Fluorescence Parameters ◽  
Plant Nitrogen

The effect of biochar application on photosynthetic traits and yield in peanut (Arachis hypogaea L.) is not well understood. A 2-year field experiment was conducted in Northwest Liaoning, China to evaluate the effect of biochar application [0, 10, 20, and 40 t ha−1 (B0, B10, B20, and B40)] on leaf gas exchange parameters, chlorophyll fluorescence parameters, and yield of peanut. B10 improved photochemical quenching at flowering and pod set and reduced non-photochemical quenching at pod set, relative to B0. B10 and B20 increased actual photochemical efficiency and decreased regulated energy dissipated at pod set, relative to B0. B10 significantly increased net photosynthetic rate, transpiration rate, stomatal conductance, and water use efficiency at flowering and pod set, relative to B0. Compared with B0, B10 significantly improved peanut yield (14.6 and 13.7%) and kernel yield (20.2 and 14.4%). Biochar application increased leaf nitrogen content. B10 and B20 significantly increased plant nitrogen accumulation, as compared to B0. The net photosynthetic rate of peanut leaves had a linear correlation with plant nitrogen accumulation and peanut yield. The application of 10 t ha−1 biochar produced the highest peanut yield by enhancing leaf photosynthetic capacity, and is thus a promising strategy for peanut production in Northwest Liaoning, China.

Photosynthetic Characteristics for Mongolian Scots Pine Plantation and its Relation with Environmental Factors

2011 ◽  
Vol 393-395 ◽  
pp. 1334-1340 ◽  
Author(s):  
Jie Zhang ◽  
Zhao Gang Liu
Keyword(s):  
Environmental Factors ◽  
Net Photosynthetic Rate ◽  
Scots Pine ◽  
Photosynthetic Rate ◽  
Intercellular Co2 Concentration ◽  
Light Response ◽  
Co2 Concentration ◽  
Dynamic Responses ◽  
Diurnal Changes ◽  
Long Time

The needles' light dynamic response for net photosynthetic rate (Pn), the diurnal changes of net photosynthetic rates of annual Mongolian Scots pine and the relationship between of its Pn and environmental factors were studied in this paper by using LI-6400 portable photosynthesis system. Results show that needles at different positions of the crown have different light response for their net photosynthetic rate. Pn, photosynthetic saturated light intensity (PSLI) and light compensation point (LCP) of needles decreased from upper-crown through mid-crown to lower-crown. It suggests that different light dynamic responses of needles at different positions be related to micro-light environment to which needles acclimated in a long time. Diurnal variation of Pn showed a single peak. It had significantly positive correlation with stomatal conduction (Cond), transpiration rate (Tr) (at 0.01 level) and photosynthetically active radiation (PAR) (at 0.05 level), and significantly negative correlation with the intercellular CO2 concentration (Ci) (at 0.05 level).

scholarly journals The Influence of Soil Tillage System on Changes in Gas Exchange Parameters of Pisum sativum L.

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1000
Author(s):  
Jolanta Bojarszczuk
Keyword(s):  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Soil Tillage ◽  
No Tillage ◽  
Gas Exchange Parameters ◽  
Tillage System ◽  
Intercellular Co2 ◽  
Exchange Parameters

A field experiment was carried out in 2017–2019 as a split-plot design with four replicates at the Agricultural Experimental Station in Grabów, Poland. The aim of the study was to compare the gas exchange parameters of the pea depending on the use of different soil tillage systems. Physiological plant parameters as: net photosynthetic rate (PN), transpiration rate (E), stomatal conductance (gs), intercellular CO2 concentration (Ci) and relative chlorophyll content were measured in three developmental stages. The study have showed that all the measured parameters were affected by the tillage system of the soil. Net photosynthetic rate and transpiration rate were significantly lower in the treatments, where simplified-tillage was applied. Pea grown in the plough tillage (CT) showed a generally higher rate of net photosynthesis and transpiration rate compared to that of peas grown in the reduced tillage and no-tillage systems, but this was dependent on the plant development stage and the weather conditions prevailing in a given year. The highest intercellular CO2 concentration (Ci) under different cultivation methods were found in the no-tillage system, regardless of the developmental stage of legumes. The values of determination coefficients showed a positive relationship between the photosynthetic rate and seed yield of the peas tested in all the years of the research. The study also showed that a significantly higher SPAD index was found in the CT tillage system, irrespectively on the developmental stage.

scholarly journals Photosynthesis and Related Physiological Parameters Differences Affected the Isoprene Emission Rate among 10 Typical Tree Species in Subtropical Metropolises

2021 ◽  
Vol 18 (3) ◽  
pp. 954
Author(s):  
Junyao Lyu ◽  
Feng Xiong ◽  
Ningxiao Sun ◽  
Yiheng Li ◽  
Chunjiang Liu ◽  
...  
Keyword(s):  
Photosynthetic Rate ◽  
Tree Species ◽  
Urban Areas ◽  
Emission Rate ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Single Species ◽  
Photosynthetic Parameters ◽  
Emission Rates ◽  
Isoprene Emission

Volatile organic compound (VOCs) emission is an important cause of photochemical smog and particulate pollution in urban areas, and urban vegetation has been presented as an important source. Different tree species have different emission levels, so adjusting greening species collocation is an effective way to control biogenic VOC pollution. However, there is a lack of measurements of tree species emission in subtropical metropolises, and the factors influencing the species-specific differences need to be further clarified. This study applied an in situ method to investigate the isoprene emission rates of 10 typical tree species in subtropical metropolises. Photosynthesis and related parameters including photosynthetic rate, intercellular CO2 concentration, stomatal conductance, and transpiration rate, which can influence the emission rate of a single species, were also measured. Results showed Salix babylonica always exhibited a high emission level, whereas Elaeocarpus decipiens and Ligustrum lucidum maintained a low level throughout the year. Differences in photosynthetic rate and stomatal CO2 conductance are the key parameters related to isoprene emission among different plants. Through the establishment of emission inventory and determination of key photosynthetic parameters, the results provide a reference for the selection of urban greening species, as well as seasonal pollution control, and help to alleviate VOC pollution caused by urban forests.

scholarly journals Effect of Water Deficit on Gas Exchange Responses to Intercellular CO2 Concentration Increase of Quercus suber L. Seedlings

2019 ◽  
Vol 12 (1) ◽  
pp. 73
Author(s):  
Mokhtar Baraket ◽  
Sondes Fkiri ◽  
Ibtissam Taghouti ◽  
Salma Sai Kachout ◽  
Amel Ennajah ◽  
...  
Keyword(s):  
Water Deficit ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Quercus Suber ◽  
Cork Oak ◽  
Concentration Increase ◽  
Effect Of Water ◽  
Negative Effect ◽  
Photosynthetic Responses ◽  
Intercellular Co2

In north Tunisia, the Quercus suber L. forests have shown a great decline indices as well as a non-natural regeneration. The climate changes could accentuate this unappreciated situation. In this study, the effect of water deficit on physiological behavior of Quercus suber seedlings was investigated. Photosynthetic responses of 15 months old Cork oak seedlings grown for 30 days under 40% and 80% soil water water content (control) were evaluated. Results showed a negative effect of water deficit and a positive effect of the intercellular CO2 concentration increase both on photosynthesis and transpiration. Stomata conductance might play a major role in balancing gas exchanges between the leaf and its environment. Moreover, global warming could negatively affect carbon uptake of Cork oak species in northern Tunisia. Elevated CO2 leaf content will benefit Cork oak growing under water deficit by decreasing both photoysnthesis and transpiration, which will decrease either the rate or the severity of water deficits, with limited effects on metabolism. the results suggest that high intercellular CO2 concentration could increase water use efficiency among Cork oak species.

scholarly journals The impact of winter flooding with saline water on foliar carbon uptake and the volatile fraction of leaves and fruits of lemon (Citrus×limon) trees

2012 ◽  
Vol 39 (3) ◽  
pp. 199 ◽  
Author(s):  
Violeta Velikova ◽  
Tommaso La Mantia ◽  
Marco Lauteri ◽  
Marco Michelozzi ◽  
Isabel Nogues ◽  
...  
Keyword(s):  
Saline Water ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Volatile Fraction ◽  
Citrus Limon ◽  
Young Leaves ◽  
Quality Water ◽  
Winter Flooding ◽  
The Impact ◽  
Intercellular Co2

We investigated the consequences of recurrent winter flooding with saline water on a lemon (Citrus × limon (L.) Burm.f.) orchard, focussing on photosynthesis limitations and emission of secondary metabolites (isoprenoids) from leaves and fruits. Measurements were carried out immediately after flooding (December), at the end of winter (April) and after a dry summer in which plants were irrigated with optimal quality water (September). Photosynthesis was negatively affected by flooding. The effect was still visible at the end of winter, whereas the photosynthetic rate was fully recovered after summer, indicating an unexpected resilience capacity of flooded plants. Photosynthesis inhibition by flooding was not due to diffusive limitations to CO2 entry into the leaf, as indicated by measurements of stomatal conductance and intercellular CO2 concentration. Biochemical and photochemical limitations seemed to play a more important role in limiting the photosynthesis of flooded plants. In young leaves, characterised by high rates of mitochondrial respiration, respiratory rates were enhanced by flooding. Flooding transiently caused large and rapid emission of several volatile isoprenoids. Emission of limonene, the most abundant compound, was stimulated in the leaves, and in young and mature fruits. Flooding changed the blend of emitted isoprenoids, but only few changes were observed in the stored isoprenoids pool.

scholarly journals Effects of lead on growth, osmotic adjustment, antioxidant activity and photosynthetic responses in Phoebe chekiangensis seedlings

2020 ◽  
Vol 48 (3) ◽  
pp. 1637-1648
Author(s):  
Yujie YANG ◽  
Wenjie LI ◽  
Xinru HE ◽  
Die HU ◽  
Yongjun FEI
Keyword(s):  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Root Surface ◽  
Root Surface Area ◽  
Photosynthetic Parameters ◽  
Root Volume ◽  
Root Shoot Ratio ◽  
Mda Content ◽  
Photosynthetic Responses ◽  
Intercellular Co2

Experiments were conducted on 1-year Phoebe chekiangensis seedlings treated by different concentration (0, 300, 600, 900, 1200 mg/L) of Pb (NO3)2. Sixty days later, determination was implemented on seedling growth, physiological and photosynthetic parameters. The results showed that the lower concentration treated could promote the growth of the seedlings. But with the increase of concentration of lead, P. chekiangensis seedling height increment, ground diameter growth, whole biomass, total root surface area, root volume, total root length and root activity decreased, while root-shoot ratio present a rising trend. With the increase of concentration of Pb(NO3)2 solution, the membrane permeability and MDA content of P. chekiangensis seedlings showed a trend of rise after the first reduce; the protein content and chlorophyll content presented a trend of decrease after the first increase; while the POD, SOD and CAT activity increased firstly but decreased afterwards; the net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, transpiration rate were all increase at first then decrease, which indicated that protection enzyme activity and membrane was damaged thus the growth of P. chekiangensis seedlings was inhibited.

scholarly journals Spatial and temporal scaling of intercellular CO2 concentration in a temperate rain forest dominated by Dacrydium cupressinum in New Zealand

2006 ◽  
Vol 29 (4) ◽  
pp. 497-510 ◽  
Author(s):  
DAVID T. TISSUE ◽  
MARGARET M. BARBOUR ◽  
JOHN E. HUNT ◽  
MATTHEW H. TURNBULL ◽  
KEVIN L. GRIFFIN ◽  
...  
Keyword(s):  
New Zealand ◽  
Rain Forest ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Temporal Scaling ◽  
Temperate Rain Forest ◽  
Intercellular Co2

Effect of Flavone from Forestry Waste C.Cathayensis Exocarp on Photosynthetic Characteristics of Crops

2012 ◽  
Vol 550-553 ◽  
pp. 2365-2368
Author(s):  
Xiang Ming Chen
Keyword(s):  
Stomatal Conductance ◽  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Rate Increase ◽  
Co2 Concentration ◽  
Total Chlorophyll ◽  
Photosynthesis Efficiency ◽  
Seedling Leaf ◽  
Intercellular Co2

Using six kinds of concentration (ranged from 0.0 to 2.0mg.L-1) of flavone extract from C.cathayensis exocarp treats corn, soybean, wheat and mung bean seedlings, in order to study the photosynthetic rate, stomatal conductance, transpiration rate, intercellular CO2 on the seedling leaf. Results show that effects of flavone extract (0.1-0.5mg.L-1) increase content of the chlorophyll a, b and total chlorophyll, promote photosynthetic rate, stomatal conductance, transpiration rate, proper increase cell gap inside the CO2 concentration.0.1mg.L-1 treatment effect is the most obvious compare with the control, the total chlorophyll and photosynthetic rate increase by 20.9 % and 21% respectively; More than 0.5mg.L-1, the chlorophyll content, photosynthetic rate, stomatal conductance, transpiration rate decrease, the intercellular CO2 rapid increase. Research shows that, the appropriate concentration of flavone can increase the chlorophyll content in the leaf, promote stomatal opening, increase of intracellular CO2 supply, improve leaf photosynthesis efficiency.

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