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2013 ASHS Annual Conference

13512:
Elicitation of Physiological Stress and Kaempferol Accumulation in Soybean by Sugar Treatment

Monday, July 22, 2013: 1:00 PM
Desert Salon 1-2 (Desert Springs J.W Marriott Resort )
Amber Cook, Xavier University of Louisiana, New Orleans, LA
Demitrius Onuaguluchi, Xavier University of Louisiana, New Orleans, LA
Jeremiah Jackson, Xavier University of Louisiana, New Orleans, LA
Bradley Patterson, Xavier University of Louisiana, New Orleans, LA
Lindsey Gilbert, University of Pikeville, Pikeville, KY
Shannon Combe, Xavier University of Louisiana, New Orleans, LA
Shubha Ireland, Xavier University of Louisiana, New Orleans, LA
Syed Muniruzzaman, Xavier University of Louisiana, New Orleans, LA
Stephen Boue, USDA–ARS, New Orleans, LA
Harish Ratnayaka, Biology, Xavier University of Louisiana, New Orleans, LA
Soy flavonoids, such as kaempferols, are well-known anticancer phytochemicals biosynthesized especially under environmental stress.  Natural easy-to-use elicitors that can impose the right level of stress to adequately induce flavonoid accumulation in soy plants are not readily available.  Thus, a greenhouse experiment was conducted to test the hypothesis that rare sugars will impose physiological stress and increase leaf flavonoid kaempferol yields.  Two rare sugars, D- psicose and allose, and two common sugars, D- glucose and fructose were applied at 10 mM semi-hydroponically at V5 stage for seven days.  Net photosynthesis was reduced by all sugars up to a maximum of 48% by D-psicose.  Reduced stomatal conductance, rubisco carboxylation and photosystem II efficiency appear to contribute to lower photosynthesis.  Rare sugar-treated plants quenched excitation energy nonphotochemically more than control or common sugar-treated plants.  Growth of expanded and expanding leaves was reduced up to 11% and 24%, respectively, by the sugars.  Concentrations of leaf kaempferols increased under all sugar treatments up to a maximum of 40% in D- allose-treated plants.  Both natural and rare hexose sugars are promising natural elicitors of physiological stress that can induce anticancer flavonoid kaempferol synthesis in soy plants.
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