Browsing by Author "J. N. B. Bell"

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    Impact of ambient air pollution on locally grown rice cultivars (Oryza sativa L.) in Malaysia
    (Kluwer Academic Publishers, 2004) S. Ishii; F. M. Marshall; J. N. B. Bell; A. M. Abdullah
    This study presents the first experimental evidence of the sensitivity of rice plants to ambient air pollution from the Southeast Asian tropical region. Two widely adopted local cultivars of rice (Oryza sativa L.), MR84 and MR185, were grown in open top chambers ventilated with charcoal-filtered air and non filtered air, and in adjacent open plots on the campus of University Putra Malaysia. This is located on the south side of the Klang Valley, a rapidly developing area embracing Kuala Lumpur and other satellite cities, but where agriculture remains important The experimental period was from October 2000 to January 2001, corresponding to the main rice growing season in peninsular Malaysia. Adverse impacts on rice growth and yield were observed and were attributed to phytotoxic levels of ambient ozone.
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    Physiological and morphological responses of locally grown Malaysian rice cultivars (Oryza Sativa L.) to different ozone concentrations
    (Kluwer Academic Publishers, 2004) S. Ishii; F. M. Marshall; J. N. B. Bell
    Malaysian rice (Oryza sativa L.) cultivars MR84 and MR185 were grown in greenhouse chambers and exposed to four different levels of ozone from 28th August, 2001 to 22nd January, 2002. Four ozone levels were selected in close relation to the Malaysian peri-urban ambient level (approximately 30 ppb, 8 hr mean), the Malaysian guideline level (approximately 60 ppb) and possible future higher ozone levels (approximately 90 ppb). Both morphological and physiological parameters showed distinctive impacts of ozone treatments.