to assess nickel-induced toxicity in plants, zea mays seeds were germinated and cultured on nutrient solution with nickel concentrations of 0, 50, 100 and 200 μm for a period of two weeks. its effects on the growth, hill reaction and photosynthetic pigments content were then investigated. the fresh and dry weight of leaves and roots increased in 50 μm nickel, but decreased in 100 and 200 μm. th...

Recently a i uniber of investigators have reported that the Hill reaction is mior-e ral)i(l in the plreelice of CO., thiani in its absence. However., thle phenome1on1 (it CO., dependence can only Ie (lemonstrated un(ler certain conl(litioiis and it is thlerefore regrettable that there hlas beenino agreement as to the nlattire of these cond(litions. \Warburg an(l Kiippahl ( 9) haxve stresse(l th...

objective: in order to study the effect of drought stress, salicylic acid (sa) and  jasmonic acid (ja) foliar application on hill reaction and photosynthetic pigments. methods:experiment was done as factorial on the basis of completely randomized design in 4 replications. irrigation in 3 levels (fc,   fc and  fc), salicylic acid in 2 levels (0 and 0.5 mm) and jasmonic acid in 2 levels (0 and 50...

In order to avoid the problem of an uncoupling effect in stimulation of potential Hill reaction activity during extraction with heptane. Hill reaction activity was measured with uncoupled spinach chloroplasts. The reactions were also run under aerobic conditions. Under these conditions a correction for a 3-(p-chlorophenyl)-1, 1-dimethylurea insensitive, photostimulated O(2) uptake reaction is n...

Hill activity with ferricyanide and nicotinamide adenine dinucleotide phosphate and photoreduction of NADP and methyl red supported by ascorbate and 2,6-dichloroindophenol were studied as a function of the size of chloroplast fragments. Sonic treatment of chloroplasts resulted in a decrease in Hill activity with NADP and ferricyanide. The decrease was accompanied by a change in the dependency o...

Since the discovery of the Hill reaction (9, 10, 11, 12), there has accumulated considerable evidence (5, 7, 10, 14, 15, 16, 17, 20) indicating that it is indeed a partial reaction of photosynthesis. And in particular there is evidence that the normally limiting dark reactions of photosynthesis and the Hill reaction are identical (5, 7). Numerous substances inhibitory to photosynthesis and the ...