柑桔种子、木质部传播黄龙病(CYS)病原可能性的探研
RESEARCE ON TRANSMISSION OF CITRUS YELLOW SHOOT ORGANISMS (CYS-BLOs) BY SEED AND XYLEM
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摘要: 柑桔黄龙病不能通过种子传播,但可通过木质部传病。木质部传病率低,潜育期长。木质部传病株的叶脉韧皮部可见类似黄龙病病原的类细菌,壁膜厚度15~20nm。木质部则未见。Abstract: Preliminarily experimental results indicated that the organisms causing citrus yellow shoot (CYS-BLOs), can’t be transmitted, by seed, but can be transmitted occasionally through xylem tissue.A low incidence of disease (3.3%) and a long latent period (15 months) was obtained when it was transmitted through xylem. Many pleomorphic bodies of bacterium-like organism, 90-640×100-1530 nm in size, with an envelope of 15-30nm in thickness, were observed in sieve tube cells of leafvein of the diseased plant caused by xylem transmission and it was absent in xylem vessels. It is possible that CYS-BLOs can transfer to sieve tube cells through xylem vessel in some case, and they grow well in sieve cells only.
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