Growth, Stomatal Conductance, Photosynthetic Rate, Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase and Phosphoenolpyruvate Carboxylase Activities during Rooting and Acclimatisation of Rosa Hybrida Plantlets

2000 ◽  
Vol 38 (4) ◽  
pp. 629-634 ◽  
Author(s):  
C. Genoud ◽  
H. Sallanon ◽  
A. Hitmi ◽  
Y. Maziere ◽  
A. Coudret
Keyword(s):  
Stomatal Conductance ◽  
Photosynthetic Rate ◽  
Phosphoenolpyruvate Carboxylase ◽  
Rosa Hybrida ◽  
Bisphosphate Carboxylase

The Effect of KHCO3 on Photosynthesis of Eggplant Seedlings

2013 ◽  
Vol 634-638 ◽  
pp. 1129-1134 ◽  
Author(s):  
Ying Chang Li ◽  
Jian Jun Hao
Keyword(s):  
Stomatal Conductance ◽  
Photosynthetic Rate ◽  
Impact Factors ◽  
C3 Plants ◽  
Transport Activity ◽  
Saturation Point ◽  
Rubisco Activity ◽  
Bisphosphate Carboxylase ◽  
Electron Transport Activity ◽  
Light Saturation Point

The low concentration of CO2 in the atmosphere is one of the main factors to restrict photosynthesis of C3 plants. The effect of KHCO3 on photosynthesis of eggplant seedlings was studied in order to improve photosynthesis of C3 plants. The results showed that KHCO3 could significantly enhance the photosynthetic rate of eggplant seedlings. 500mg/L KHCO3 was the most optimal concentration to improve photosynthetic rate of eggplant seedlings. KHCO3 could increase light saturation point, CO2 saturation point, carboxylase efficiency and lower CO2 compensate point of eggplant seedlings. KHCO3 could improve stomatal conductance and electron transport activity. There was phosphoenolpyruvate carboxylase (PEPC) in leaves of eggplant seedlings, but PEPC activity was low. KHCO3 could improve ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity and PEPC activity. From impact factors, HCO3- could enhance photosynthetic rate. K+ could raise stomatal conductance of eggplant seedlings. HCO3- could improve activity of PEPC . Both HCO3- and K+ could increase Rubisco activity.

Nitrogen enhanced photosynthesis of Miscanthus by increasing stomatal conductance and phosphoenolpyruvate carboxylase concentration

2012 ◽  
Vol 50 (4) ◽  
pp. 577-586 ◽  
Author(s):  
X. P. Feng ◽  
Y. Chen ◽  
Y. H. Qi ◽  
C. L. Yu ◽  
Bing-Song Zheng ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Phosphoenolpyruvate Carboxylase

Effects of Clone and Irrigation on the Stomatal Conductance and Photosynthetic Rate of Tea (Camellia sinensis)

1994 ◽  
Vol 30 (1) ◽  
pp. 1-16 ◽  
Author(s):  
B. Gail Smith ◽  
Paul J. Burgess ◽  
M. K. V. Carr
Keyword(s):  
Stomatal Conductance ◽  
Camellia Sinensis ◽  
Photosynthetic Rate ◽  
Leaf Temperature ◽  
Temperature Optimum ◽  
Photosynthetic Rates ◽  
Clone Selection ◽  
Treatment Interaction ◽  
Dry Seasons ◽  
The Relationship

SummaryStomatal conductances (g) and photosynthetic rates (A) were monitored in six tea clones planted in a clone X irrigation experiment in the Southern Highlands of Tanzania. Measurements were made during the warm dry seasons of 1989 and 1990. There was no genotype X treatment interaction in the response in A or g of the various clones to irrigation. Irrigation increased A more than it increased g. Irrigation also increased the temperature optimum for photosynthesis and decreased photo-inhibition at high illuminance. Clones differed in g and A, and in the relationship between leaf temperature and A. The implications of these findings for clone selection are discussed.

scholarly journals Leaf Temperature and Vapour Pressure Deficit (VPD) Driving Stomatal Conductance and Biochemical Processes of Leaf Photosynthetic Rate in a Subtropical Evergreen Coniferous Plantation

2018 ◽  
Vol 10 (11) ◽  
pp. 4063 ◽  
Author(s):  
Yue Li ◽  
Lei Zhou ◽  
Shaoqiang Wang ◽  
Yonggang Chi ◽  
Jinghua Chen
Keyword(s):  
Stomatal Conductance ◽  
Photosynthetic Rate ◽  
Vapour Pressure Deficit ◽  
Leaf Temperature ◽  
Slash Pine ◽  
Seasonal Patterns ◽  
Subtropical China ◽  
Biochemical Processes ◽  
Leaf Photosynthetic Rate ◽  
Positive Effect

Photosynthesis is arguably the most important biochemical process on Earth, which is dramatically influenced by environmental conditions. How environmental factors drive stomatal conductance and biochemical processes of leaf photosynthetic rate has not been sufficiently investigated in subtropical China. In this study, we analysed the effects of stomatal and biochemical parameters on the photosynthetic rate of native Masson’s pine (Pinus massoniana Lamb.) and exotic slash pine (Pinus elliottii Engelm.) in response to leaf temperature and vapour pressure deficit (VPD) in subtropical China, based on leaf gas exchange measurements in 2016. Our results showed that there was no significant difference in the light-saturated photosynthetic rate (Asat) between native Masson’s pine and exotic slash pine. The seasonal patterns of maximum rate of the carboxylation (Vcmax25) were basically consistent with seasonal patterns of Asat for both species. The positive effect of leaf temperature on Asat was mainly produced through its positive effect on Vcmax25. Leaf temperature had no significant effect on stomatal conductance. Vcmax25 and gs simultaneously affected Asat in response to VPD. Our results highlighted the importance of biochemical processes in limiting leaf photosynthetic rate in response to environmental conditions in subtropical evergreen coniferous plantations.

scholarly journals Response of in vitro Cultured Palm Oil Seedling Under Saline Condition to Elevated Carbon Dioxide and Photosynthetic Photon Flux Density

2012 ◽  
pp. 52-64
Author(s):  
Pet Roey Pascual ◽  
Krienkai Mosaleeyanon ◽  
Kanokwan Romyanon ◽  
Chalermpol Kirdmanee
Keyword(s):  
Stomatal Conductance ◽  
Net Photosynthetic Rate ◽  
Elevated Co2 ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Pigment Contents ◽  
Salinity Levels ◽  
Oil Palms ◽  
Ambient Co2

Salt stress elicits various physiological and growth responses of oil palm. A laboratory experiment was conducted to determine the responses of oil palms cultured in vitro under varying salinity levels (0, 85.5, 171.11, 342.21 and 684.43 mM NaCl) to elevated CO2 (1000 μmol CO2/mol) and PPFD (100±5 μmol m-2s-1) in terms of growth characteristics, pigment contents and photosynthetic abilities. After 14 days of culture, net photosynthetic rate (μmol CO2 m-2s-1) of oil palms across varying salinity levels was 5.33 times higher than those cultured under ambient CO, (380±100 Mmol CO2/mol) and PPFD (50±5 μmol m-2s -1). At increased net photosynthetic rate (elevated CO2 and PPFD), despite having no significant difference in pigment contents (chlorophyll a, chlorophyll b, total chlorophyll and carotenoid) between different CO2 and PPFD levels, dry weight and percent dry matter were 0.26 and 0.11 times higher, respectively, as compared to those cultured under ambient CO2 and PPFD. In the same elevated CO2 and PPFD level, across all salinity levels, stomatal conductance was 0.30 times lower than those cultured under ambient CO2 and PPFD. At reduced stomatal conductance (elevated CO2 and PPFD), transpiration rate was also reduced by 0.30 times. Thus with increased net photosynthetic rate and reduced transpiration rate, water use efficiency was increased by 7.22 times, across all salinity levels, than those cultured at ambient CO2 and PPFD. These were considered essential for NaCl produces iso-osmotic stress.

scholarly journals Patatesin Kısa Süreli Kuraklık Uygulamasına Fizyolojik Tepkileri

2016 ◽  
Vol 4 (7) ◽  
pp. 618
Author(s):  
İlknur Tındaş ◽  
Ufuk Demirel
Keyword(s):  
Stomatal Conductance ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Tuber Yield ◽  
Russet Burbank ◽  
Significant Decline ◽  
Proline Content ◽  
Drought Treatment ◽  
H2o2 Accumulation ◽  
Tuber Bulking

The study aimed to identify physiological response of potato to drought. For this aim, a drought experiment was carried out by using two different potato varieties, cv. Desiree and Russet Burbank, under environmentally controlled greenhouse conditions. Drought treatment was initiated at 45 days after emergence (early tuber bulking period) by withholding irrigation for 10 days. Physiological traits such as stomatal conductance, transpiration rate, photosynthetic rate, chlorophyll index, leaf temperature, proline content, malondialdehyde (MDA) accumulation and hydrogen peroxide (H2O2) accumulation, in addition, some yield components average tuber weight, number of tubers and plant tuber yield were evaluated in the study. While the first significant decline in stomatal conductance, transpiration rate, and photosynthetic rate of both varieties was occurred at the 5th day of withholding irrigation, the highest decline was observed at 9th and 10th days of withholding irrigation. Proline content in both varieties increased two times at 10th day of withholding irrigation, however, H2O2 accumulation was not changed significantly by drought treatment. Even though MDA accumulation was increased in both varieties under drought stress conditions, the increase was significant in Desiree whereas, it was not significant in Russet Burbank. In addition, while drought treatment did not change the plant tuber yield in both varieties, it caused to a significant decline in average tuber yield of Russet Burbank, being an important trait for marketable tuber yield.

scholarly journals Effects of the reciprocal grafting on the photosynthesis of two genotypes tomato offspring under selenium stress

2019 ◽  
Vol 136 ◽  
pp. 07008
Author(s):  
Shiyao Shan ◽  
Huizhong Luo ◽  
Jinpeng Zhu ◽  
Zhiyu Li ◽  
Huanxiu Li
Keyword(s):  
Stomatal Conductance ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Functional Activity ◽  
Theoretical Basis ◽  
Photosynthetic Capacity ◽  
Growth Characteristics ◽  
Cherry Tomato ◽  
Fresh Weight

To study the effects of the reciprocal grafting on the photosynthesis of two genotypes tomato offspring under selenium stress, red ball cherry tomato cherry 5-5-1 and yellow ball cherry tomato yellow RTY-3-2 post-grafting generation (red scion, red rootstock, yellow scion and yellow rootstock) and seedlings (red CK and yellow CK) planted in 10 mg·kg-1 selenium soil, and the pot experiment was carried out to study the effects of the reciprocal grafting on the growth characteristics and the photosynthesis of tomato offspring under selenium stress. The results showed that grafting increased the fresh weight of the organs of the offspring, the ratio of root to shoot, and the functional activity of the roots of the plants, which was conducive to the growth of tomato offspring. Simultaneously, it could effectively improve the photosynthetic capacity of grafted offspring leaves at the seedling stage. The grafted offspring of rootstocks had the best effect on improving the net photosynthetic rate, stomatal conductance and transpiration rate and stomatal conductance of tomato leaves, and decreased intercellular CO2 concentration. Among them, the best effect of yellow rootstock was to provide ideas and theoretical basis for the production of selenium-enriched tomatoes in the selenium-deficient areas in the future.

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