Boron toxicity impacts on photosystem II photochemical efficiency of sage (Salvia officinalis)

被引:2
作者
Arslan, Ozlem [1 ]
机构
[1] Univ Giresun, Univ Coll Espiye, Dept Food Proc, TR-28600 Giresun, Turkey
关键词
chlorophyll fluorescence; fluorescence; transient; JIP test; nutrient toxicity; photosynthesis; photosynthetic;
D O I
10.2298/BOTSERB2201113A
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Although boron (B) is an essential element for plants, it becomes toxic in high concentrations. This study was conducted to determine the effects of B toxicity on the photosynthetic performance of sage (Salvia officinalis). Twenty-day old cuttings were exposed to toxic B concentrations (2.5, 5, 7.5, and 10 mM) for 20 days. Chlorophyll fluorescence measurements were determined and analysed by the JIP test. The toxic B content led to a gradual decrease in the efficiency of electron transport, the quantum yields, the photosynthetic performances, and the driving force in sage, while causing an increase in the K-band, L-band, and specific and phenomenological energy fluxes. Membrane damage and water loss gradually increased in response to the severity of toxicity levels (-4.3 fold and 19.5% at 10 mM B, respectively). The reductions in the amounts of photosynthetic pigment and photosynthetic activity showed that sage was highly affected by B toxicity, and even increased anthocyanin and flavonoid amounts were unable to alleviate this effect. Exposure to increased B concentrations was associated with the amount of B accumulation in the sage leaves. This dramatic B accumulation in the sage leaves, which are used in herbal teas and food flavourings, can pose a threat to human health depending on the characteristics of the soil in which the sage grows. An evaluation of PSII photochemical efficiency may serve to determine the effects of B toxicity in sage.
引用
收藏
页码:113 / 119
页数:7
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