Photosynthetica 1998, 35(1):71-78 | DOI: 10.1023/A:1006821931577

Impact of simulated acidic rain on growth, photosynthetic pigments, cell metabolites, and leaf characteristics of green gram

G. Kumaravelu1, M.P. Ramanujam1
1 Botany Laboratory, K.M. Centre for Post Graduate Studies, Pondicherry, India

Seedlings of green gram (Vigna radiata cv. ADT-1 and CO-5) were exposed to daily showers of simulated acidic rain (H2SO4 : HNO3 : HCl, 4 : 2 : 1, v/v) for 10 d. The effects were analysed after 5 and 10 showers, respectively. Rain of pH 2.5 inhibited seedling growth and biomass accumulation, though in other acidic levels the effects were mostly inconsistent. Both cultivars had high degree of surface wettability indicated by high leaf surface contact angles and water-holding capacity. Treated leaves were thinner with smaller mesophyll cells. Stomatal index and trichome density were lower in contrast to epidermal cell density and stomatal frequency which increased with increasing acidity. Decreases in chlorophyll (Chl), carotenoid (Car), and starch contents in cv. ADT-1 at pH 2.5 were observed after 5 showers, while in cv. CO-5 decreases were noted only after 10 showers. In contrast to total sugar levels, the protein content of cv. CO-5 was augmented significantly after simulated acidic rain (SAR) treatment.

Additional key words: carotenoids; chlorophyll; leaf wettability; mesophyll volume; plant height; starch; stomatal index; sugars; Vigna radiata

Prepublished online: March 1, 1998; Published: January 1, 1998  Show citation

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Kumaravelu, G., & Ramanujam, M.P. (1998). Impact of simulated acidic rain on growth, photosynthetic pigments, cell metabolites, and leaf characteristics of green gram. Photosynthetica, 35(1), 71-78. doi: 10.1023/A:1006821931577
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