scholarly journals Studies on CO2 Uptake and CO2 Evolution in Each Part of Crop Plants : (III) Variation of photosynthetic rate in different part of leaf on rice, corn and sorghum plant

1975 ◽  
Vol 44 (4) ◽  
pp. 389-396
Author(s):  
Touru SATO ◽  
Yukindo TSUNO
Keyword(s):  
Photosynthetic Rate ◽  
Crop Plants ◽  
Co2 Uptake ◽  
Co2 Evolution ◽  
Sorghum Plant

scholarly journals Studies on CO2 Uptake and CO2 Evolution in Each Part of Crop Plants : II. Photosynthetic activity in the leaf sheath and ear of rice plant

1975 ◽  
Vol 44 (3) ◽  
pp. 287-292 ◽  
Author(s):  
Yukindo TSUNO ◽  
Touru SATO ◽  
Hiroshi MIYAMOTO ◽  
Norimasa HARADA
Keyword(s):  
Rice Plant ◽  
Photosynthetic Activity ◽  
Leaf Sheath ◽  
Crop Plants ◽  
Co2 Uptake ◽  
Co2 Evolution

Effect of carbon dioxide and temperature on photosynthetic CO2 uptake and photorespiratory CO2 evolution in sunflower leaves

Planta ◽  
1979 ◽  
Vol 145 (3) ◽  
pp. 219-223 ◽  
Author(s):  
H. Fock ◽  
K. Klug ◽  
D. T. Canvin
Keyword(s):  
Carbon Dioxide ◽  
Co2 Uptake ◽  
Co2 Evolution

scholarly journals Some Effects of Temperature on Carbohydrate Utilization and Plant Growth

1966 ◽  
Vol 19 (4) ◽  
pp. 711 ◽  
Author(s):  
RL Burt
Keyword(s):  
Plant Growth ◽  
Photosynthetic Rate ◽  
Crop Plants ◽  
Net Assimilation Rate ◽  
Assimilation Rate ◽  
Carbohydrate Utilization ◽  
Present Evidence ◽  
Effects Of Temperature ◽  
Net Assimilation

Present evidence suggests that, in a wide variety of crop plants, growth and net assimilation rate may be determined by the ability of the plant to utilize or store the products of photosynthesis rather than by the capacity of the assimilatory surface to produce them (Humphries 1963; Humphries and Thorne 1964; Thorne and Evans 1964; Burt 1964). Humphries (1963) further suggests that temperature, by varying the ability of the plant to utilize the assimilate, may partly govern the photosynthetic rate of the plant.

scholarly journals Dynamic Simulation of the Crown Net Photosynthetic Rate for Young Larix olgensis Henry Trees

Forests ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 321
Author(s):  
Qiang Liu ◽  
Longfei Xie ◽  
Fengri Li
Keyword(s):  
Net Photosynthetic Rate ◽  
Dynamic Simulation ◽  
Photosynthetic Rate ◽  
Elevation Angle ◽  
Distribution Model ◽  
Co2 Uptake ◽  
Relative Depth ◽  
Larix Olgensis ◽  
Larix Olgensis Henry

Numerical integration of the instantaneous net photosynthetic rate (An) is a common method for calculating the long-term CO2 uptake of trees, and accurate dynamic simulation of the crown An has been receiving substantial attention. Tree characteristics are challenging to assess given their aerodynamically coarse crown properties, spatiotemporal variation in leaf functional traits and microenvironments. Therefore, the variables associated with the dynamic variations in the crown An must be identified. The relationships of leaf temperature (Tleaf), the vapor pressure deficit (VPD), leaf mass per area (LMA) and the relative depth into the crown (RDINC) with the parameters of the photosynthetic light-response (PLR) model of Larix olgensis Henry were analyzed. The LMA, RDINC and VPD were highly correlated with the maximum net photosynthetic rate (Amax). The VPD was the key variable that mainly determined the variation in the apparent quantum yield (AQY). Tleaf exhibited a significant exponential correlation with the dark respiration rate (Rd). According to the above correlations, the crown PLR model of L. olgensis trees was constructed by linking VPD, LMA and RDINC to the original PLR equation. The model performed well, with a high coefficient of determination (R2) value (0.883) and low root mean square error (RMSE) value (1.440 μmol m−2 s−1). The extinction coefficient (k) of different pseudowhorls within a crown was calculated by the Beer–Lambert equation based on the observed photosynthetically active radiation (PAR) distribution. The results showed that k was not a constant value but varied with the RDINC, solar elevation angle (ψ) and cumulative leaf area of the whole crown (CLA). Thus, we constructed a k model by reparameterizing the power function of RDINC with the ψ and CLA, and the PAR distribution within a crown was therefore well estimated (R2 = 0.698 and RMSE = 174.4 μmol m−2 s−1). Dynamic simulation of the crown An for L. olgensis trees was achieved by combining the crown PLR model and dynamic PAR distribution model. Although the models showed some weakened physiological biochemical processes during photosynthesis, they enabled the estimation of long-term CO2 uptake for an L. olgensis plantation, and the results could be easily fitted to gas-exchange measurements.

Physiological adaptation to performance as crop plants

1976 ◽  
Vol 275 (936) ◽  
pp. 71-83 ◽  
Keyword(s):  
Leaf Area ◽  
Photosynthetic Rate ◽  
Crop Plants ◽  
Physiological Adaptation ◽  
Wild Plant ◽  
Unit Leaf ◽  
Physiological Adaptations ◽  
Storage Organs ◽  
Synchronous Development ◽  
Cytogenetic Changes

Morphological and cytogenetic changes associated with evolution from wild plant to cultivar have been explored for many crop plants, but the physiological adaptations are less well known. Selection for better performance as crops has not been associated with increase in relative growth rate or photosynthetic rate. In fact, photosynthetic rate per unit leaf area has fallen during the evolution of some crops, but this has been counterbalanced by greater leaf area and duration of photosynthetic activity. The capacity to transport assimilates to the storage organs has increased, due mainly to additional phloem differentiation rather than to closer proximity of source and sink organs. Greater size or number of storage organs, together with their more compact arrangement and more synchronous development, have all contributed to their predominance as a sink for assimilates and mobile nutrients towards the end of the life cycle, attracting progressively more substance to the organs harvested by man.

scholarly journals Validation of an Enzyme-Driven Model Explaining Photosynthetic Rate Responses to Limited Nitrogen in Crop Plants

2020 ◽  
Vol 11 ◽  
Author(s):  
Alamgir Khan ◽  
Zhiwei Wang ◽  
Kang Xu ◽  
Liyan Li ◽  
Lingchao He ◽  
...  
Keyword(s):  
Photosynthetic Rate ◽  
Crop Plants
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