Abstract
To determine Al and Ca effects on photosynthesis and chlorophyll fluorescence of taro [Colocasia esculenta (L.) Schott, cv. Lehua maoli] plantlets were grown hydroponically at four levels of Al (0, 440, 890, and 1330 µM) and two levels of Ca (100 and 1000 µM). Increasing Al levels significantly reduced leaf area, photosynthesis, maximum photochemical yield of photosystem II (PSII) (Fv/Fm), quantum yield of electron transport through PSII (o PSII), and photochemical quenching (qp). An increased Ca level significantly increased leaf area, Ca concentration in leaf blades, photosynthesis, Fv/Fm, and oPSII. The detrimental effect of excess Al on photosynthesis and Fv/Fm was ameliorated by high solution Ca. It was hypothesized that a high Ca level helped to stabilize thylakoid membrane structure against disruption by Al.
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