How does salicylic acid (SA) affect the photosynthetic pigments in Swiss chard (Beta vulgaris L.) under different irrigation treatments?

Label:chem

Topic
Photosynthetic pigments, such as chlorophylls and carotenoids, are crucial for the photosynthetic efficiency and overall growth of plants. The study investigated the effects of different irrigation treatments and foliar application of SA on the levels of chlorophyll a, chlorophyll b, and β-carotene in Swiss chard.

From: "Effects of foliar application of salicylic acid on physiological and qualitative parameters in differently colored Swiss chard (Beta vulgaris L. ssp. cicla) under an aquaponic system", Journal of Agriculture and Food Research, Volume 22, August 2025, 102140
Answer
The study found that the 50/100 treatment caused a reduction in chlorophyll a and β-carotene levels in both white and red chard varieties. However, the 50F/50D treatment increased chlorophyll b levels in both chard varieties. The application of SA had varying effects: it decreased chlorophyll a and β-carotene levels in plants irrigated with 100S, but increased chlorophyll b in red chard. These results suggest that SA can influence photosynthetic pigment levels, potentially affecting photosynthetic efficiency and plant growth, depending on the irrigation treatment and chard variety.
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