Photosynthetic efficiency

If noncyclic photosynthetic electron transport leads to the translocation of 3 H /e and cyclic photosynthetic electron transport leads to the translocation of 2 H /A, what is the relative photosynthetic efficiency of ATP synthesis (expressed as the number of photons absorbed per ATP synthesized) for noncyclic versus cyclic photophosphorylation (Assume that the CFiCEq ATP synthase yields 1 ATP/3 H. )... 

METHODS TO STUDY PHOTOSYNTHETIC EFFICIENCY, CHLOROPHYLL A AND B IN PLANTS... 

Phenolic compounds of dominant plants (donor plants) in plant community have inhibitory effects on photosynthesis of target plants. Methods of the photosynthetic efficiency (Fv/Fm) measurement, the extraction, detection and measurement of chlorophyll (a, and b) are described. 

Principle Chlorophyll fluorescence is a sensitive and early indicator of damage to photosynthesis and to the physiology of the plant resulting from the effect of allelochemicals, which directly or indirectly affects the function of photosystem II (Bolhar-Nordenkemf et ah, 1989, Krause and Weiss 1991). This approach is convenient for a photosynthesis analysis in situ and in vivo and quick detection of otherwise invisible leaf damage. The photosynthetic plant efficiency was measured using the method of induced chlorophyll fluorescence kinetics of photosystem II [Fo, non-variable fluorescence Fm, maximum fluorescence Fv=Fm-Fo, variable fluorescence t /2, half the time required to reach maximum fluorescence from Fo to Fm and photosynthetic efficiency Fv/Fm]. 

Statistical analysis Each sample was taken in at least 5 replicates. The statistical analysis of the photosynthetic efficiency (Fv/Fm) of the species that were examined was performed using a one way-ANOVA analysis. 

Pinto LSRC et al.. Symptomless infection of banana and maize by endophytic fungi impairs photosynthetic efficiency. New Phytol 147 609—615, 2000. 

Burger, J. and Edwards, G.E., Photosynthetic efficiency, and photodamage by UV and visible radiation, in red versus green leaf coleus varieties, Plant Cell Physiol, 37, 395, 1996. 

Bugbee, B., Salisbury, F. B. (1988). Exploring the limits of crop productivity. I. Photosynthetic efficiency of wheat in higher irradiance environments. Plant Physiol., 88, 869-878. 

The acquisition of carbon is strongly modulated by the surface area of photosynthesizing leaves hence, understanding leaf area development is germane to efforts to increase yield. In many crops, biomass is linearly related to the amount of light intercepted (Monteith, 1977). This is certainly the case for Jerusalem artichoke, where total productivity is strongly correlated with the amount of solar radiation intercepted (Denoroy, 1996 Meijer et al., 1993). Leaf area, leaf duration, and photosynthetic efficiency of the crop canopy determine how much light is intercepted and subsequently utilized (Table 10.9). 

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