Responses of Thai rice cultivar Chainat I (Oryza sativa L.) to enhanced tropospheric ozone concentrations

Name: Watita Ariyaphanphitak

Organization : King Mongkut's University of Technology Thonburi. The Joint Graduate School of Energy and Environment

Name: Amnat Chidthaisong

Organization : King Mongkut's University of Technology Thonburi. The Joint Graduate School of Energy and Environment

Name: Ed Sarobol

Organization : Kasetsart University. Faculty of Agriculture. Deparment of Agronomy

Name: Sirintornthep Towprayoon

Organization : King Mongkut's University of Technology Thonburi. The Joint Graduate School of Energy and Environment

Name: Bashkin, Vladimir N

Organization : King Mongkut's University of Technology Thonburi. The Joint Graduate School of Energy and Environment

keyword: Rice

; Atmosphere

Abstract: Rice is staple food for the majority of world population. Various studies in the past have shown that elevated ozone concentration significantly decreased rice growth and yields. In Thailand, industrialzation and urbanization during the past decades have resulted in increasing pollutants and ozone concentrations in the atmosphere. Since Thailand is the agriculture-based country, it is necessary to know the effects of this increasing ozone on some important economic crops. In this study we report the effects of elevated O3 concentration on productivity and some physiology of one of Thai rice cultivars Chainat I. Rice cultivar Chainat I was exposed in the closed chamber to different levels of O3 (O, ambient, 50, 100 and 150 ppb), covering 3 successive stages of rice growth. The duration for exposure was 7 h day-1 for entire growing period. The effects were found in all stages. Compared to control at the first growth stage, 150 ppb O3 concentration showed the most significant reduction in shoot dry weight, root dry weight, total dry weight and root length by 29%, 51%, 36% and 17%, respectively. Grain yield were reduced by 52% and 4.8%, in terms of ratio between filled seed/panicle and 100 seeds weight, respectively. Reductions of net photosynthesis, chloro phyll a content, ratio of chlorophyll a/b and carotenoid contents were 29%, 57%, 66% and 90%, respectively. Strong correlation between enhanced mean ozone concentration and reduced grain yield, net photosynthesis, total chloro phyll content, chlorophyll a content, chloro phyl a : chlorophyll ratios and carotenoid content was found. The results indicate that the elevated concentrations of tropospheric ozone significantly reduced productivity of Thai rice cultivar Chainat I and suppressed some physiological performance

King Mongkut's University of Technology Thonburi. KMUTT Library

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Created: 2003

Modified: 2017-09-19

Issued: 2017-05-04

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BibliograpyCitation : Proceedings of the 2nd Regional Conference on Energy Technology Towards a Clean Environment, Phuket, V2 12-14 February 2003 p. 733-738

CallNumber: 12002408

eng

©copyrights King Mongkut's University of Technology Thonburi

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