The short-term temperature-dependency of CO2 photosynthetic responses of two Vitis vinifera cultivars grown in a hot climate

2018 ◽  
Vol 147 ◽  
pp. 125-137 ◽  
Author(s):  
Dennis H. Greer
Keyword(s):  
Vitis Vinifera ◽  
Temperature Dependency ◽  
Short Term ◽  
Hot Climate ◽  
Photosynthetic Responses

Modelling seasonal changes in the temperature-dependency of CO2 photosynthetic responses in two Vitis vinifera cultivars

2018 ◽  
Vol 45 (3) ◽  
pp. 315 ◽  
Author(s):  
Dennis H. Greer
Keyword(s):  
Vitis Vinifera ◽  
Seasonal Changes ◽  
Vitis Vinifera L ◽  
Temperature Dependency ◽  
Seasonal Climate ◽  
Average Temperature ◽  
Internal Co2 ◽  
Photosynthetic Responses ◽  
Temperature Optima ◽  
Cultivar Difference

A study of photosynthesis of two grapevine cultivars, Vitis vinifera L. cv. Chardonnay and cv. Merlot in relation to the seasonal climate and internal CO2 (Ci) concentration at leaf temperatures from 15 to 45°C was undertaken. Average rates of photosynthesis at saturating CO2 concentrations and all leaf temperatures were higher in Merlot compared with Chardonnay leaves. This was attributable to higher rates of ribulose 1,5-bisphosphate (RuBP) carboxylation (Vcmax) and regeneration (Jmax) in Merlot leaves. These differences in photosynthesis were extended as the season progressed, partly because rates of RuBP carboxylation and regeneration of Chardonnay leaves declined markedly whereas rates for Merlot leaves remained high. Although there was no cultivar difference in the seasonal average temperature optima for assimilation (34°C) and the underlying metabolism (40°C for Vcmax and 35°C for Jmax), for temperatures above 35°C, the Merlot leaves had 50% higher rates. Across the season, activation energies of the temperature sensitivity of Vcmax and Jmax declined in response to the seasonal climate but were consistently lower in Merlot than Chardonnay. This suggested some apparent differences in the biochemistry occurred between the two cultivars that limited assimilation in Chardonnay leaves, especially at higher temperatures, but did not limit assimilation in Merlot leaves.

Photosynthetic responses of Coffea arabica leaves to a short-term high light exposure in relation to N availability

1997 ◽  
Vol 101 (1) ◽  
pp. 229-239 ◽  
Author(s):  
Jose C. Ramalho ◽  
Thos L. Pons ◽  
Henri W. Groeneveld ◽  
M. Antonieta Nunes
Keyword(s):  
Coffea Arabica ◽  
Light Exposure ◽  
High Light ◽  
N Availability ◽  
Short Term ◽  
Photosynthetic Responses

scholarly journals Short-term thermal photosynthetic responses of C4 grasses are independent of the biochemical subtype

2017 ◽  
Vol 68 (20) ◽  
pp. 5583-5597 ◽  
Author(s):  
Balasaheb V Sonawane ◽  
Robert E Sharwood ◽  
Susanne von Caemmerer ◽  
Spencer M Whitney ◽  
Oula Ghannoum
Keyword(s):  
C4 Grasses ◽  
Short Term ◽  
Photosynthetic Responses

Photosynthetic responses of Coffea arabica leaves to a short-term high light exposure in relation to N availability

1997 ◽  
Vol 101 (1) ◽  
pp. 229-239 ◽  
Author(s):  
Jose C. Ramalho ◽  
Thijs L. Pons ◽  
Henri W. Groeneveld ◽  
M. Antonieta Nunes
Keyword(s):  
Coffea Arabica ◽  
Light Exposure ◽  
High Light ◽  
N Availability ◽  
Short Term ◽  
Photosynthetic Responses

Short-term photosynthetic responses in the diatom Nitzschia americana to a simulated salinity environment

1986 ◽  
Vol 8 (2) ◽  
pp. 305-315 ◽  
Author(s):  
Richard L. Miller ◽  
Daniel L. Kamykowski
Keyword(s):  
Short Term ◽  
Photosynthetic Responses

Carbon Dioxide Exchange in Response to Change of Environment and to Defoliation in a Tobacco Crop

1980 ◽  
Vol 7 (4) ◽  
pp. 473 ◽  
Author(s):  
DM Whitfield ◽  
DJ Connor ◽  
PJM Sale
Keyword(s):  
Carbon Dioxide ◽  
Dark Respiration ◽  
Leaf Age ◽  
Early Flowering ◽  
Carbon Dioxide Exchange ◽  
Long Term Effects ◽  
Short Term ◽  
Photosynthetic Responses ◽  
Response To Change ◽  
Response To Temperature

Rates of carbon dioxide exchange of field-grown tobacco crops at early flowering and maturity were measured using a pair of large closed-system field chambers. Photosynthetic responses to irradiance and temperature were investigated on both occasions. Rate of dark respiration and its response to temperature were measured during the night. Defoliation treatments were employed to disrupt the correlation between leaf age and light environment in the canopy. In these experiments, the short-term photosynthetic response to irradiance was determined for crops that were progressively defoliated upwards or downwards. Long- term effects of varying intensities of downward defoliation were also investigated. Maximum photosynthetic rates of 3.7 g CO2 m-2 h-1 were achieved at early flowering. These had fallen to 1.9 g CO2 m-2 h-1at maturity. Maximum rates occurred at an irradiance of approximately 700 W m-2. Short-term shifts in temperature in the range 10-32°C had little effect during the day, but dark respiration was strongly dependent on temperature. Defoliation experiments demonstrated that lower leaves retained a significant potential for photosynthesis but their contri- bution to the total exchange of CO2 of mature crops was only small. This was attributed in part to the poorer light regime in the lower canopy. Results are discussed in the context of the development of yield and quality in flue-cured tobacco.

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