Differences between tomato genotypes in stomatal resistance and specific leaf fresh weight in relation to differences in net photosynthesis under low light intensity and low night temperatures

Euphytica ◽  
1985 ◽  
Vol 34 (3) ◽  
pp. 717-723 ◽  
Author(s):  
Siebren J. van de Dijk
Keyword(s):  
Light Intensity ◽  
Net Photosynthesis ◽  
Stomatal Resistance ◽  
Fresh Weight ◽  
Low Light ◽  
Low Light Intensity ◽  
Tomato Genotypes

scholarly journals Differences between genotypes of tomato (Lycopersicon esculentum Mill.) in net photosynthesis, light absorption by leaves, chlorophyll content and specific leaf fresh weight under low-energy conditions.

1988 ◽  
Vol 36 (4) ◽  
pp. 396-399
Author(s):  
M. Nieuwhof ◽  
S.J. van de Dijk
Keyword(s):  
Light Intensity ◽  
Chlorophyll Content ◽  
Light Absorption ◽  
Net Photosynthesis ◽  
Low Energy ◽  
Energy Conditions ◽  
Fresh Weight ◽  
Low Light ◽  
Tomato Genotypes ◽  
High Chlorophyll Content

Differences in net photosynthesis between tomato genotypes, grown under low light intensity and, from day 30, at 3 night temperatures, were largely due to differences in the capacity of the leaves to absorb light. Variation in chlorophyll content and leaf thickness largely explained the differences in light absorption. Genotypes with large thin leaves and a high chlorophyll content were thought to be best adapted to low-energy conditions. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Constraint-based modelling revealed changes in metabolic flux modes associated with the Kok effect

2020 ◽  
Author(s):  
Wei Qiang Ong ◽  
C. Y. Maurice Cheung
Keyword(s):  
Quantum Yield ◽  
Light Intensity ◽  
Energy Demand ◽  
Metabolic Flux ◽  
Net Photosynthesis ◽  
Quantum Yields ◽  
Energetic Efficiency ◽  
Low Light ◽  
Subtle Change ◽  
Low Light Intensity

AbstractConstraint-based modelling was applied to provide a mechanistic understanding of the possible metabolic origins of the ‘Kok effect’ – the change in quantum yield of net photosynthesis at low light intensity. The well-known change in quantum yield near the light-compensation point (LCP) was predicted as an emergent behaviour from a purely stoichiometric model. From our modelling results, we discovered another subtle change in quantum yield at a light intensity lower than the LCP. Our model predicted a series of changes in metabolic flux modes in central carbon metabolism associated with the changes in quantum yields. We demonstrated that the Kok effect can be explained by changes in metabolic flux modes between catabolism and photorespiration. Changes in RuBisCO carboxylation to oxygenation ratio resulted in a change in quantum yield at light intensities above the LCP, but not below the LCP, indicating the role of photorespiration in producing the Kok effect. Cellular energy demand was predicted to have no impact on the quantum yield. Our model showed that the Kok method vastly overestimates day respiration – the CO2 released by non-photorespiratory processes in illuminated leaves. The theoretical maximum quantum yield at low light intensity was higher than typical measured values, suggesting that leaf metabolism at low light may not be regulated to optimise for energetic efficiency. Our model predictions gave insights into the set of energetically optimal changes in flux modes in low light as light intensity increases from darkness.One sentence summaryThe Kok effect can be explained by the changes in flux modes between catabolism and photorespiration.

scholarly journals Response of Photosynthesis and Chlorophyll Fluorescence Parameters of Castanopsis kawakamii Seedlings to Forest Gaps

Forests ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 21
Author(s):  
Zhong-sheng He ◽  
Rong Tang ◽  
Meng-jia Li ◽  
Meng-ran Jin ◽  
Cong Xin ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Light Intensity ◽  
Seedling Growth ◽  
Group Treatment ◽  
Control Group ◽  
Low Light ◽  
Chlorophyll Fluorescence Parameters ◽  
Forest Gaps ◽  
Low Light Intensity ◽  
Weak Light

Light is a major environmental factor limiting the growth and survival of plants. The heterogeneity of the light environment after gap formation in forest influences the leaf chlorophyll contents, net photosynthetic rate (Pn), and chlorophyll fluorescence, thus influencing the growth and regeneration of Castanopsis kawakamii seedlings. The aim of this study was to explore the effects of weak light on the photosynthetic physiology of C. kawakamii seedlings in forest gaps and non-gaps. The results showed that (1) the contents of chlorophyll a (Chl-a), chlorophyll b (Chl-b), and total chlorophyll (Chl-T) in forest gaps were lower than in non-gaps. Seedlings tended to increase chlorophyll content to absorb light energy to adapt to low light intensity in non-gap environments. (2) The Pn values of C. kawakamii seedlings in forest gaps were significantly higher than in non-gaps, and forest gaps could improve the seedlings’ photosynthetic capacity. (3) The C. kawakamii seedlings in forest gaps were more sensitive to weak light and control group treatment, especially the tall seedlings, indicating that seedlings require more light to satisfy their growth needs in the winter. The seedlings in non-gaps demonstrated better adaptability to low light intensity. The light intensity was not adequate in weak light conditions and limited seedling growth. We suggest that partial forest selection cutting could improve light intensity in non-gaps, thus promoting seedling growth and regeneration of C. kawakamii more effectively in this forest.

Sign in / Sign up

Export Citation Format

Share Document