Toward Elicitation of Bioactive Secondary Compounds with Environmentally Sound Plant Treatments: Insight into the Balance between Photosynthetic Primary and Kaempferol Accumulating Secondary Metabolism Using Young Soybean Plants

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Toward Elicitation of Bioactive Secondary Compounds with Environmentally Sound Plant Treatments: Insight into the Balance between Photosynthetic Primary and Kaempferol Accumulating Secondary Metabolism Using Young Soybean Plants

June 19, 2021 Agricultural Sciences 0

There are few environmentally friendly plant treatments that can impose mild physiological stress and induce bioaccumulation of useful phytochemicals like kaempferols. In young greenhouse-grown soy plants, we tested ABA foliar application at 100 or 200 M, as well as two types of leaf wounding, piercing or hole punching. The same leaf was used to measure gas exchange and A/Ci response, PSII, pigments, and antiradical activity, while the leaf above was used to measure kaempferols. When compared to the control, ABA 200 M-treated plants had 20% less gas exchange and 17% less ETR, but higher Vcmax and Jmax. They had 55% and 100% more stomatal limitation to Pnet and PSII, respectively. in comparison to the control Leaf-wounded plants exhibited the least stomatal limitation to Pnet or PSII. When compared to the control, leaf piercing increased chlorophylls by 39% and carotenoids by 38%. Six kaempferols were identified as mono-, di-, and triglycosides. When compared to the control, each leaf treatment increased total kaempferol yield by 42 percent in the ABA 100 M treatment and 68 percent in the ABA 200 M treatment. In general, kaempferol yields in ABA 100 M were positively correlated with Pnet. Pnet in leaf-pierced plants was negatively correlated with gs in ABA 200 M-treated plants and positively correlated with gs in ABA 200 M-treated plants. The findings of this study show that environmentally friendly foliar treatments can significantly increase kaempferol yield and thus phytochemical or nutritional quality of soy leaves. ABA application and wounding had different effects on the relationship between photosynthetic primary metabolism and kaempferol accumulation. ABA application and wounding are both promising leaf treatments for increasing kaempferol levels in young soy leaves.

Author (S) Details

H. H. Ratnayaka
Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA-70125, US.

S. Boue
USDA-ARS, Southern Regional Research Center, 1100 Robert E. Lee Boulevard, New Orleans, LA 70124, US.

T. Dinh
Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA-70125, US.

S. B. Le
Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA-70125, US.

R. Cherubin
Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA-70125, US.

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