engleski

Photosynthetic efficiency of soybean on cadmium contaminated soil

Cadmium (Cd) is a toxic heavy metal that, after accumulation in plant organs, can cause a number of alterations in the functioning of plant cell. The study was conducted on six soybean genotypes grown in soil with four different levels of cadmium contamination (0, 0.5, 1 and 5 mg Cd kg-1 soil). Contamination was performed with 10 mL of prepared CdCl2 solution, per every kg of soil, for each treatment separately (B2-B4). Photosynthetic efficiency (PIABS) was measured on soybean leaves in R3 development stage. PIABS values of different soybean genotypes showed continuous decrease in all treatments of soil contaminated with Cd. Genotype A4 showed the highest average values of photosynthetic efficiency in all treatments while genotype A2 showed the lowest value of PIABS in all treatments. Relative values of PIABS ranged from 0.4925 to 2.6673, which shows that this parameter is sensitive to very small and early detectable changes in the functioning of the photosynthetic apparatus. Measurement of chlorophyll a fluorescence is a very useful method for detecting the influence of environmental stresses on plant vitality and, which is even more important for breeders, determining differences between investigated genotypes.

soybean ; stress ; cadmium contamination ; photosynthetic efficiency ; performance index

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