Effect of gibberellic acid on marigold (Calendula Officinalis L.) was evaluated in a pot culture experiment. A factorial experiment based on completely randomized design including 12 treatments and four replications was carried out. Main factor was foliar application stages (first, second and third) and sub factor included different concentrations of GA3 (0, 50, 150 and 250 mg L...

The experiments were conducted in earthen pots lined with polythene sheet to find out the effect of different concentrations of cobalt (0, 50, 100, 150, 200 and 250 mg/kg soil) on various morphological parameters, photosynthetic pigment contents and antioxidant enzyme activities on greengram (Vigna radiata (L.) Wilczek). Plants were watered to field capacity daily. Plants were thinned to a maxi...

Photosynthetic light harvesting is a unique life process that occurs with amazing efficiency. Since the discovery of the structure of the bacterial peripheral light-harvesting complex (LH2), this process has been studied using a variety of advanced laser spectroscopic methods. We are now in a position to discuss the physical origins of excitation energy transfer and trapping in the LH2 and LH1 ...

abstract   aluminum is one of the most important heavy metals which not only can be easily absorbed by roots, but it also damages its normal function and blocks absorption of water and nutrients. according to this fact that sunflower has been widely used in industry, this study investigates the effects of aluminum toxicity on biochemical factors in two sunflower varieties including sirena (tole...

Arctic fjord systems experience large amplitudes of change in temperature and radiation regime due to climate warming the related decrease sea ice. The resultant increase irradiance entering water column influences photosynthetic activity benthic pelagic primary producers. subtidal brown alga Desmarestia aculeata and intertidal red alga Palmaria palmata populate cold-tempera...

Cytochromes bc1/b6f complexes catalyze electron transfer from lipid- to water-soluble carriers in both the respiratory and photosynthetic processes. They contain several common redox cofactors, while a chlorophyll a molecule, the function of which is still enigmatic, is only present in b b6f-type complexes. In this work, we describe a mutagenesis approach aimed at characterizing the role of thi...

Turnip seedlings (Brassica rapa L.) irradiated for 24 hours with radiation at 720 nanometers synthesize chlorophyll a and anthocyanin. Antimycin A and 2,4-dinitrophenol, which are known to reduce cyclic photophosphorylation, also reduce anthocyanin synthesis. Noncyclic photophosphorylation is inhibited by 3-(3,4-dichlorophenyl)-1,1-dimethylurea and o-phenanthroline. These compounds promote cycl...

The Gulf Coast of North America (GC) is a ‘hot spot’ of Phragmites diversity as several lineages (defined according to the haplotypes of their chloroplast DNA) differing in origin, genetic traits and phenotype co-exist and interbreed in this area. We analysed differences in photosynthetic characteristics among and within four haplotypes to understand if differences in gas exchange can be attrib...

The effects of increased photosynthetic active radiation (PAR), UV radiation (UVR), and nutrient supply on photosynthetic activity, pigment content, C:N ratio and biomass yield were studied in tank cultivated Gracilaria conferta (Rhodophyta). Electron transport rate (ETR) and biliprotein content were higher under high nutrient supply (HNS), obtained from fishpond effluents, compared to low nutr...

There is a growing need for developing high-throughput tools for crop phenotyping that would increase the rate of genetic improvement. In most cases, the indicators used for this purpose are related with canopy structure (often acquired with RGB cameras and multispectral sensors allowing the calculation of NDVI), but using approaches related with the crop physiology are rare. High-resolution hy...