Responses of radish (<i>Raphanus sativus</i> L.) plants at different growth phases to ozone exposure

Responses of radish (<i>Raphanus sativus</i> L.) plants at different growth phases to ozone exposure

Authors

  • Usha Mina Department of Environmental Sciences, Indian Agricultural Research Institute, New Delhi 110012, India.
  • Abhai Pratap Singh School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
  • C. K. Varshney School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.

Keywords:

Ground level ozone, Ozone injury symptoms, Membrane permeability

Abstract

Three growth phases of radish (Raphanus sativus var. ‘Pusa chetki’) namely, early vegetative phase (EVP, 20 days); late vegetative phase (LVP, 35 days); and reproductive phase (RP, 50 days) were exposed to two ozone concentrations (75 and 150 ppb) in closed top dynamic chambers for 12 days. Ozone treated plants exhibited visible injuries (white spots mainly on the upper surface of leaves). Significant reductions in shoot length (4 to 35 %), shoot biomass (4 to 62 %), total number of flowers (10 to 44 %), and hypocotyl biomass (40 to 80 %) were also observed. Ozone exposure was more detrimental during EVP compared to LVP and RP. Results of this study also showed that 150 ppb of ozone exerted more harmful effects at all growth phases than 75 ppb.

Author Biographies

Usha Mina, Department of Environmental Sciences, Indian Agricultural Research Institute, New Delhi 110012, India.

scientist, DEPARTMENT OF ENVIRONMENTAL SCIENCES, IARI, PUSA, NEW DELHI

Abhai Pratap Singh, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.

RESEARCH SCHOLAR School of Environmental Sciences, Jawaharlal Nehru University, New Delhi-110067, India

C. K. Varshney, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.

PROFESSOR AT School of Environmental Sciences, Jawaharlal Nehru University, New Delhi-110067, India

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Published

18-12-2009

How to Cite

Mina, U., Singh, A. P., & Varshney, C. K. (2009). Responses of radish (<i>Raphanus sativus</i> L.) plants at different growth phases to ozone exposure. Journal of Tropical Agriculture, 47(1), 53–57. Retrieved from https://jtropag.kau.in/index.php/ojs2/article/view/204

Issue

Vol. 47 No. 1 (2009)

Section

Regular papers

License

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