3.3 Photosynthetic pigments content
Treatment with redroot pigweed leachate significantly affected photosynthetic pigment concentrations of cucumber and wheat plants (Table 4). In cucumber plant, chlorophyll b, total chlorophyll, total carotenoid, and β-caroten increased and chlorophyll a to b ratio and lutein content decreased, which was statistically significant (p ≥ 0.01). In wheat plant, chlorophyll a was significantly decreased by amaranth leachate, which resulted in a significant decrease in total chlorophyll and chlorophyll a to b ratio (p ≥ 0.01). Total carotenoid in wheat was not affected utterly by applied concentrations of leachate, however, β-caroten content was significantly decreased (p ≥ 0.01).