The societal importance of renewable carbon-based commodities and energy carriers has elicited a particular interest for high performance phototrophic microorganisms. Selection of optimal strains is often based on direct comparison under laboratory conditions of maximal growth rate or additional valued features such as lipid content. Instead of reporting growth rate in culture, estimation of ph...

Alfalfa (Medicago sativa L.) plants acclimated to photoperiods of 18 hours light, 6 hour dark in plant growth chambers exhibited a daily cyclic pattern of floret volatile emanation with a maximum emanation of about 6.5 nanograms of hydrocarbons/floret.30 minutes. This maximum was reached about 6 to 8 hours into the light period. After 8 hours of light, emanation of volatiles decreased rapidly t...

The chlorophyll fluorescence parameter Fv/Fm (maximum photosynthetic efficiency of optical system II) is an intrinsic index for exploring plant photosynthesis. Hyperspectral remote sensing technology can be used rapid nondestructive detection parameters. Existing studies show that there a good correlation between the vegetation and Fv/Fm. However, due to limited hyperspectral information reflec...

Abbreviations: a*PSII, optical cross section for photosys factor; Chl a, chlorophyll a; Ci, inorganic carbon; CO2, carb anhydrase; ETR, electron transport rate; FIRe, fluorescence Fm′ , light-adapted maximum fluorescence; Fv/Fm, maximum tochemistry in photosystem II; HCO3, bicarbonate; HEPE according to Lavergne and Trissl (1995); MIMS, membran enine dinucleotide phosphate; NaHCO3, sodium bicar...

GRAMS T.E.E. & MATYSSEK R. 1999. Elevated CO2 counteracts the limitation by chronic ozone exposure on photosynthesis in Fagus sylvatica L.: Comparison between chlorophyll fluorescence and leaf gas exchange. Phyton (Horn, Austria) 39 (4): (31) (40). The interaction of elevated CO2 and enhanced chronic ozone (O3) impact was analysed throughout the growing season in the photosynthetic response (ch...

In the present study, we compared the effect of leaf age at one development stage on the photosynthetic behavior of a T-DNA-tagged allele of the ppt1 mutant. Chlorophyll fluorescence (Fv/Fm, where Fm is the maximum fluorescence yield and Fv is variable fluorescence) and fluorescence decay kinetics of the ppt1 mutant were different in leaves of different ages. The steady state levels of thylakoi...

Ecologists often invoke interspecific facilitation to help explain positive biodiversity–ecosystem function relationships in plant communities, but seldom test how it occurs. One mechanism through which one species may facilitate another is by ameliorating abiotic stress. Physiological experiments show that a chronic excess of light can cause stress depresses carbon assimilation. If shading pla...

introduction salinity has various effects on plant growth by affecting physiological processes. the decline in plant productivity under saline condition, frequently linked with the reduction of photosynthetic capability. it has been reported that efficiency of psii photochemistry (fv/fm) of numerous plant species have been decreased due to salt stress studies have shown that salicylic acid (sa...

In dryland agriculture, mulching methods and nitrogen application have been extensively adopted to improve water use efficiency increase crop yield. However, there has a scarcity of research on the combined effects types growth yield soybean (Glycine max L.). present study, four levels (N0: 0 kg N ha−1, N1: 60 N2: 120 N3: 180 ha−1) (NM: no mulching, SM: straw FM: film SFM: mulching) were set so...