報告書番号

482003

タイトル（和文）

低濃度複合大気汚染の植物に及ぼす影響に関する研究（１）ハツカダイコン，インゲンの生長に及ぼすＳＯ２とＯ３の影響

タイトル（英文）

STUDIES ON THE COMBINED EFFECT OF LOW LEVELSAIR POLLUTANTS ON PLANTS (1) -EFFECT OF SULFUR DIOXIDE AND/OR OZONE ONTHE GROWTH OF RADISH AND BEAN-

概要 （図表や脚注は「報告書全文」に掲載しております）

本研究は０．０４ｐｐｍの亜硫酸ガスとオゾンをそれぞれ単独あるいは複合した条件で長期にわたってハツカダイコン，インゲンに接触させ，両植物の生育・収量を調査し，複合大気汚染の植物影響の程度の評価を目的としている。主要な結果は以下のとうり：１．ハツカダイコン，インゲンともに亜硫酸ガスとオゾンの単独接触ではほとんど影響をうけていないが，複合接触では有意な生育の減少が認められた。２．インゲンでは複合ガスに対する生育反応は，品種によって異なっており，感受性の差が認められた。３．ハツカダイコン，インゲン両植物の複合ガスによる生育減退は，主として下位葉の老化が促進されていることによるものと推察された。

概要 （英文）

THE EFFECT OF CHRONIC EXPOSURE TO 0.04 PPM SULFUR DIOXIDE(24-HR/DAY) AND 0.04 PPM OZONE (10-HR/DAY,0700 TO 1700 HRS),INDIVIDUALLY AND IN COMBINATION,ON THE GROWTH OF RADISH(RAPHANUS SATIVUS L.CV.COMET) AND BEAN(PHASEOLUS VULGARIS L.) WAS EXAMINED USING A CONTROLLED ENVIRONMENT GREENHOUSE. RADISH WAS EXPOSED TO THREE TREATMENTS(SULFUR DIOXIDE,OZONE AND SULFUR DIOXIDE+OZONE) DURING 5 WEEKS FROM 10DAYS AFTER SOWING TO DETERMINE THE GROWTH RESPONSE COMPARING WITH THE CONTROL PLANT.THE OZONE AND THE SULFUR DIOXIDE+OZONE TREATMENTS CAUSED SIGNIFICANT REDUCTION IN PLANT DRY WEIGHT,LEAF AREA AND ROOT DRY WEIGHT,BUT SIGNIFICANT EFFECTS WERE NOT DETECTED IN THE SULFER DIOXIDE TREATMENT.THE EFFECT OF TWO GASES IN COMBINATION ON DRY WEIGHT GROWTH WAS SYNERGISTIC(GREATER THAN ADDITIVE).GROWTH ANALYSIS OF RADISH SHOWED THAT THE GROWTH REDUCTION CAUSED BY THE SULFUR DIOXIDE+OZONE TREATMENT CAN BEATTRIBUTED TO A DECREASE IN THE NET ASSIMILATION RATE(NAR). TWO CULTIVARS OF BEAN WONDER CROP NO.2 (SENSITIVE TO OZONE) AND FRENCH S HORTICULTURAL (RESISTANT),WERE ALSO EXPOSED TO THREE TREATMENTS DURING 4 WEEKS FROM 10 DAYS AFTER SOWING.COMBINED TREATMENT OF SULFUR DIOXIDE AND OZONE CAUSED SIGNIFICANT GROWTH REDUCTION IN PLANT DRY WEIGHT AND LEAF AREA DEVELOPMENT IN WONDER CROP NO.2 WHILE FRENCH S HORTICULTURAL WASNOT AFFECTED.THE EFFECT OF TWO GASES IN COMBINATION ON THE GROWTH OF WONDER CROPNO.2 WAS SYNERGISTIC.THE NAR OF WONDER CROP NO.2 EXPOSED TO THE SULFUR DIOXIDE WAS ALSO DECREASED.ANALYSIS OF CHLOROPHYLL CONTENT OF LEAVES SHOWED THAT THE REDUCTION OF NAR IN WONDER CROP NO.2 CAUSED BY THE SULFUR DIOXIDE TREATMENT CAN BE ATTRIBUTED TO A PREMATURE SENESCENCE IN LOWER LEAVES.

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