|Title:||豌豆萎凋及根腐病菌在水稻田裡之生態||Other Titles:||Ecology of Pea Wilt and Root Rot Pathogens in Drained Paddy Field||Authors:||江碧涵
|Keywords:||碗豆萎凋病;Fusarium oxysporum f. sp. pisi;豌豆根腐病;Fusarium solani f. sp. pisi;水稱輪作;種子帶菌;pea fusarium wilt;Fusarium oxysporum f. sp. pisi;pea root rot;Fusarium solani f. sp. pisi;paddy rice;seedborne pathogens||Issue Date:||Jul-1985||Publisher:||植病保護學會||Journal Volume:||27||Journal Issue:||4||Start page/Pages:||317-324||Source:||植物保護學會會刊||Abstract:||
本文報告豌豆萎譏及根腐病菌在水稻田裡之分佈、族群消長、存活、及主要感染源。該二病菌在土壤中之垂直分佈，主要分佈於耕犁層（0~25cm)，並未在其下之壓成磐(26～30 cm)出現，但是可在壓成磐下方至40 cm處，偵測得若干病原菌。根腐病苗之水平分佈較為平均，萎凋病菌則聚集成簇。耕犁層病菌之密度隨兩期稻作而下降，終至不能測得，直到碗豆栽種後，其族群密度再慢慢回升。相反的，溫室及田間調查顯示，若輪作物為旱地甘藍菜則土城中病原菌密度變化不大，皆維持高密度。田間水稻及若干雜草的根部皆能携帶該二病菌，但數量極少，並非水稻田中豌豆萎凋病及根腐病之上要感染源。分析採自各地種子行或病株的種子樣品，其帶苗率差異極大，有些樣品可引起高達30%之發病率，故種子帶菌似乎是若干水稻一豌豆輪作田裡萎凋病及根腐病嚴重發生之重要感染源。
This paper reports the distribution, population fluctuation, survival and important inoculum sources of Fusarium oxysporum f. sp. pisi (FOP) and F. solanj f. sp. isi (FSP) in a rice-rice-pea rotation field. Both FOP and FSP were found mostly in the soil of tillage layer (0-25 cm) and absent in the soil of pressure pan layer (26-30 cm), but some propagules were detected in the soil below the pan down to 40 cm. The distribution of FOP in the tillage layer was uneven while FSP was more uniform after pea crop. A one-year rotation with paddy rice showed that flooding was effective to reduce both FOP and FSP in tillage layer, especially FOP was below the level of detection. However, the field was recolonized with the pathogens after growing pea plants. In contrast, the greenhouse experiments and the survey of fields rotated with cabbage revealed that both FOP and FSP maintained high densities in the soil all year round. Field survey also indicated that the root tissues of rice plants and some weeds in the paddy field could carry small amount of FOP and FSP, but they were not the main inoculum sources for pea diseases. Pea seeds obtained from market stores or diseased plants could also carry the pathogens which might produce 30% of diseases in greenhouse. Therefore, infested seeds may be the most important inoculum source for pea wilt and root rot in paddy field.
|Appears in Collections:||植物病理組|
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