Production and diseases of Angelica Keiskei, 'ashit aba', in Japan
2011
Miyata, T. | Natsuaki, K.T., Tokyo Univ. of Agriculture (Japan)
Angelica keiskei, a perennial herbal plant in the Umbelliferae family is called as 'Ashitaba' in Japanese. Because of its vigorous nature and high concentration of chalcone derivatives, A.keiskei plants are popular for medicinal and nutrition supplement purposes. Not only used as fresh vegetables, the leaf is reduced to green powder and mixed with noodles, tea, Japanese cakes and others. The plant is indigenous to Izu Islands located south of Tokyo and Shizuoka prefecture and cultivated widely in the islands as the local specialty. In 2009, mosaic symptoms were noticed in some A.keiskei plants in Oshima islands. By electron microscopy, flexuous and filamentous particles of about 830 nm in length were observed. It showed chlorotic local lessions on Chenopodium quinoa but not yet infectious to the original species by artificial inoculation. The isolate reacted positive to Potyvirus group test kit (Agdia, USA) while negative to CMV antibody. The RT-PCR [reverse transcription-polymerase chain reaction] was conducted using M4/S primers which are designed from consensus sequences of the genus Potivirus (Chen et.al.2003) and the amplified products showed low but the highest homology with Carrot thin leaf virus followed by Konjak mosaic virus. Although the identity of this virus has not been concluded, to protect A.keiskei from the impact of this virus infection, the use of healthy seedlings for propagation and aphid control are recommended.
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