Photosystem II efficiency in response to diurnal and seasonal variations in photon flux density and air temperature for green, yellow-green, and purple-leaved cultivars of sweet potato [Ipomoea batatas (L.) Lam]

Abstract

A -antheraxanthin; Car -carotenoid; Chl -chlorophyll; Fv/Fm -maximal quantum yield of PSII photochemistry for dark-adapted state; G -green; NPQ -nonphotochemical quenching; P -purple; qE -energy quenching; qI -photoinhibitory quenching; V -violaxanthin; Y -yellow-green; Z -zeaxanthin; ΔF/Fm' -the efficient quantum yield of PSII photochemistry for the light-adapted state.