Environmental stress on rice with special reference to O3 and simulated haze

Ahmad Makmom A., . and Nurul Azzura S., . and Marzuki I., . and Tay A. C., . and Akio F., . (2003) Environmental stress on rice with special reference to O3 and simulated haze. [Proceedings Paper]

Atmospheric pollution has for many years been considered an important factor causing and exacerbating plant stress. In Malaysia haze and tropospheric ozone O3 have been increasing over the past decades and will continue to do so with rapid industrialization and burning of fossil fuel. The purpose of this study is to determine the direct effects of O3 and simulated haze on physiological and growth performances of a local rice cultivar MR211. During haze and O3 exposure the enhancement of CO2 increase the plant heights number of tillers and relative growth rate for the whole plants. Chlorophyll fluorescence indicated that the photosynthetic rate of rice seedlings increase after biomass exposure. Furthermore scanning Electron Microscope SEM pictures show that the trapped particles were attached to each other and also affected the closure of stomata on the leaves. Nevertheless there was no significant response of rice seedlings towards the simulated haze and O3 due to short term experiment. On the whole it can be concluded that rice of local variety MR211 is fairly resistant to this level of O3 and simulated haze exposure.

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Abstract

Atmospheric pollution has for many years been considered an important factor causing and exacerbating plant stress. In Malaysia haze and tropospheric ozone O3 have been increasing over the past decades and will continue to do so with rapid industrialization and burning of fossil fuel. The purpose of this study is to determine the direct effects of O3 and simulated haze on physiological and growth performances of a local rice cultivar MR211. During haze and O3 exposure the enhancement of CO2 increase the plant heights number of tillers and relative growth rate for the whole plants. Chlorophyll fluorescence indicated that the photosynthetic rate of rice seedlings increase after biomass exposure. Furthermore scanning Electron Microscope SEM pictures show that the trapped particles were attached to each other and also affected the closure of stomata on the leaves. Nevertheless there was no significant response of rice seedlings towards the simulated haze and O3 due to short term experiment. On the whole it can be concluded that rice of local variety MR211 is fairly resistant to this level of O3 and simulated haze exposure.

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Item Type:	Proceedings Paper
Additional Information:	Received on 3 Dec 2007 QK710.2 M239 2003
AGROVOC Term:	RICE
AGROVOC Term:	OZONE
AGROVOC Term:	CHLOROPHYLLS
AGROVOC Term:	ENVIRONMENTAL IMPACT
AGROVOC Term:	BIOMASS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16956

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