![]() ![]() Results of this study show that appreciable increase in kaempferol yield and thus phytochemical or nutritional quality of soy leaves is achievable with environmentally friendly foliar treatments. In general, kaempferol yields were positively correlated to P net in ABA 100 µM-treated plants and to g s in ABA 200 µM-treated plants but negatively correlated to P net in leaf-pierced plants. Each leaf treatment increased total kaempferol yield ranging from 42% in ABA 100 µM to 68% in ABA 200 µM treatment compared with control. Six kaempferols quantified were found to be mono-, di- and triglycosides. Leaf piercing increased chlorophylls 39% and carotenoids 38% compared with the control. Leaf-wounded plants showed the lowest stomatal limitation to either P net or \(\phi\) PSII. They had 55% and 100% more stomatal limitation to P net and \(\phi\) PSII, respectively, than the control. ABA 200 µM-treated plants had \(\geq\)20% less gas exchange and 17% less ETR, but greater V cmax and J max compared with control. Leaf gas exchange and A/ C i response, \(\phi\) PSII, pigments and antiradical activity were measured using the same leaf and kaempferols were measured in the leaf above. We tested ABA foliar application, 100 or 200 µM, and two types of leaf wounding, piercing or hole punching in young greenhouse-grown soy plants. Environmentally sound plant treatments that can impose mild physiological stress and elicit bioaccumulation of useful phytochemicals such as kaempferols are limited. ![]()
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