Hovenia tomentella

Jujube witches broom (JWB) phytoplasma was transferred to the host plant, Zizipus jujuba, by the leafhopper Hovenia tomentella (Kusunoki et al., 2002). 

Subsequent to the isolation of the dammarane-type triterpenoid glycosides jujuboside B (112), hodulosides I-V (113-117), hovenoside I, and saponins C2, E, and H (122-125) as sweetness inhibitors from the leaves of Hovenia dulcis Thunb. var. tomentella Makino [139], hodulosides VII-X (118-121) were isolated as sweetness-inhibitory agents [140]. Hodulosides I (113) and II (114) have hovenolactone (151) as their aglycone which is the same compoimd as in saponins E (124) and H (125). Hodulosides Ill-V and VII-X (115-121) are based on two different danunarane-type aglycone structures, however [139,140]. The sweetness-inhibitory potencies of hodulosides are shown in Table 2. The sweetness-inhibitory potency of hoduloside X (121) was not determined [140]. 

Hovenia dulcis and H. tomentella have been shown to elaborate the new alkaloids hovenine A and hovenine B in addition to the known frangulanine. Hovenine A has been shown to be iV-desmethylfrangulanine (45) on the basis of chemical correlation with frangulanine. The structure of hovenine B has not been defined. Texensine, isolated from Colubrina texensis, has been assigned structure (46),... 

Ceanothus americanus (rb), Discaria longispina (r), Euonymus europaeus (1, r, rb, sb), Hovenia dulcis (rb), H. tomentella (rb), Rhamnus frangula (sb), Zizyphus jujuba var. inermis (sb), Z sativa (sb)... 

Takai, M., Y. Ogihara, and S. Shibata New Peptide Alkaloids from Hovenia dulcis and H. tomentella. Phytohemistry, 12, 2985 (1973). 

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