EFFECT OF HERBICIDES ON PHOTOSYNTHETIC EFFICIENCY AND ANTIOXIDATIVE RESPONSE OF SOYBEAN (GLYCINE MAX (L.) MERR.)

Abstract

Soja (Glycine max (L.) Merr.) predstavlja jednu od ekonomski najvažnijih usjeva u svijetu zbog njene hranidbene vrijednosti. Kako bi se optimizirao prinos soje, koristi se široki spektar komercijalnih herbicida namijenjenih za kontrolu korova u usjevima. Iako su korišteni herbicidi selektivni, i dalje mogu uzrokovati oksidacijski stres soje, a da bi se održala homeostaza unutar biljke aktivira se antioksidacijski odgovor. U ovome radu cilj je bio istražiti izazivaju li komercijalni herbicidi oksidacijski stres kod dvije sorte soje Ika i Zora te utvrditi kako ti herbicidi utječu na protok energije po aktivnim reakcijskim središtima fotosustava II. Rezultati su pokazali različit odgovor dviju sorti soje na tretman herbicidima tijekom razvoja. Obje istraživane sorte soje pokazale su da tretman herbicidima nije doveo do oksidacijskog stresa, no pokazale su različite mehanizme prilagodbe tijekom razvoja. Protok energije po aktivnim reakcijskim središtima fotosustava II te povezanost dijelova fotosustava II također je pokazao različit odgovor Ike i Zore tijekom razvoja na tretman herbicidima koji su pokazali negativan utjecaj ponajviše na transportni lanac elektrona kod obje sorte.Soybean (Glycine max (L.) Merr.) is one of the most economically important crops in the world due to its nutritional value. To optimize soybean yield, a wide range of commercial herbicides intended for weed control in crops are used. Although used herbicides are selective, they can still cause oxidative stress to soybeans. To maintain homeostasis within the plant, a response of the antioxidant system is activated. In this paper, the aim was to investigate whether commercial herbicides cause oxidative stress in two soybean cultivars Ika and Zora and to determine how these herbicides affect the energy fluxes through the active reaction centres of photosystem II. The results showed a different response of the two soybean cultivars to herbicide treatment during development. Both investigated soybean cultivars showed that herbicide treatment did not lead to oxidative stress. However, they showed different adaptation mechanisms during development. The energy fluxes through the active reaction centres of photosystem II and the connection within photosystem II also showed a different response of Ika and Zora to herbicide treatment during development. A negative impact was observed mainly on the electron transport chain in both varieties

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