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The Response of Radish to Nitrogen Dioxide, Sulfur Dioxide, and Ozone, Alone and in Combination¹

ABSTRACT

Effects on radish (Raphanus sativus L.) cv. ‘Cherry Belle’ of nitrogen dioxide (NO₂), sulfur dioxide (SO₂), and ozone (O₃) alone and in combination at 0.2 or 0.4 ppm of each pollutant were studied. There was no difference in foliage or root weight of radish between exposure durations of 3 or 6 hours, and no significant interaction of hours with air pollutant and concentration. Ozone reduced root dry weight more at 0.4 ppm than at 0.2 ppm. Sulfur dioxide depressed the root/shoot ratio at both 0.2 and 0.4 ppm; however, when NO₂ and SO₂ were both present there was synergistic depression of the root/shoot ratio at 0.4 ppm. The average O₃-induced reduction in root weight of radish (1.75 g fresh and 101 mg dry, per plant) was additive in the presence of NO₂ and SO₂. The weight of the root was reduced even though the foliage was the direct receptor of the pollutant stress.

Key Words: environment • interaction • air pollutants

¹ Cooperative investigations of the USDA-SEA-AR and North Carolina State Univ., Raleigh, NC 27650. Paper no. 6578 of the Journal Series of the North Carolina Agric. Res. Serv., Raleigh.

² Plant Pathologist and Agricultural Research Technician, respectively, AR-SEA-USDA, North Carolina State Univ.

³ Mention of a trademark, proprietary product, or vendor does not constitute a guarantee or warranty by the USDA or the North Carolina Agric. Res. Serv., and does not imply approval of said products or vendors to the exclusion of others that may also be suitable.

Received for publication June 24, 1980.