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W55418333 abstract "Ambient air pollution has been shown to reduce the yield of several major cropsspecies. Research and field observations have suggested that O3 may responsible forup to 90% of tlie crop loss induces by air pollutants. One approach that has beenused to estimate effects of ozone 011 yield is by determination critical Oj levelscumulated exposure over tlie threshold of 49 ppb ( ~ 0 7 4 0 ) Thc AOT40 iscalculated as tlie sum of'tlie differences between the hollrly ozone concentrations inppb and 40 ppb for cacli hour lien the concentration exceeds 40 ppb.'fliis study is aimed to in~estignteth e responses of Malaysian local rice ci~ltivar( MR2 19) to ci~rrent ambient ozone (0;) in Muda Agriculti~ral Development Autlinrity(MAIIA). Open top clia~nberst hat ventilated with ambient air and charcoal-filteredair was used to assess the impact of air pollution on the physiology and growth o!'rice. I'lie rice crop was grown according to the local crop management practice itliI C S ~ C Cto~ the rate of fertilizer and pesticides application and water supply.The result shoi,ed the plant height in the non-filtered chamber decreased by 2.8% atcgetative stage, 12.1% at reproductive stage and 6.1% at ripel:ing stage ascompared to the crop gron in the filtered chamber. Average number of tillers perpoint in the filtered chamber as 14. nith a maximum of 29. hereas for nonfilteredchamber it was 1 I it11 a main~uni of24.I n general, the relative grouth rate (RGRd,,) for all plant parts were Iligher in stage Ithan in stage I1 and 111. The stariqtical analysis of RGR*,, for all plant parts werc notsignificant different at 95% confident level.l he study also indicated that the pollutant affected the physiolog! no st during thevegetative stage. Photos! nthesis rate (P,) was observed to be significant different atthe 95% confident level beteen filtered and non-filtered plant at egetative stage.Photosynthetic capacit) (P,,,.,,) in filtered plant was 18.8 p o l CO: ~n-' s-I, and 12ynol C02 ni-2 s-' in non-tiltercd plmr during the vegetative stage. At reproductivetage the difference in 1d1010~!111h~i!r, ate between filtered and nnn-filtered plantia not significant (9j00 conticlcn~It . el). Photosynthetic capacitj (P,.,,) , in the nonfilteredplant was 13.9 p o l C.0: 111 s-I. and 13.5 pt11ol CO: m-' s for the filteredplant.'l'he transpiration rate (/ between the plants in the filtered and nonfilteredchamber ,as signitica:?: it)!% confident level) during the .egetative stagebut not during reproductic 3ta;i'. I lie differences in stomata conduct::nce betweentlic liltered and non-1iltcrc.d plarith during thc vegetative and rcproductivc stageswcrc not significant ( ~ 5 co~n)ri cicrit level).PEFiPUSTM(AAN SULTAN ABDUL SAMADUNIVElHTI PUTXA MALAYSIAAt the final harvest, the differences in yield between the filtered and non-filteredchambers at 95% confidence level was significant. The average of total weight ofgrain in the filtered chamber was 120.7g per plant and 90.978 per plant in nonliltrredchamber. The mean 100 yields grain weight for filtered and non-filteredchambers were 2.71g and 2.578, respectively. However, the difference between 100filled grain weight for the two chambers was not significant (95% confidence level)." @default.
W55418333 created "2016-06-24" @default.
W55418333 creator A5081027059 @default.
W55418333 date "2005-07-01" @default.
W55418333 modified "2023-09-27" @default.
W55418333 title "Measurement of Growth, Photosynthesis and Transpiration Rates of a Malaysian Local Rice Cultivar (Mr 219) for Assessing Ambient Ozone Stress" @default.
W55418333 hasPublicationYear "2005" @default.
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