Abstract
6‐Hydroxy‐5‐isopropyl‐3,8‐dimethyl‐4a,5,6,7,8,8a‐hexahydronaphthalen‐2(1H)‐one (HHO) is an allelopathic substance that is related to allelochemical metabolism in Eupatorium adenophorum. In this study, the full‐length complementary DNA of two phenylalanine ammonia‐lyase (PAL) genes and a fragment of the cinnamate 4‐hydroxylase (CA4H) gene from E. adenophorum (Ea) were cloned. The expression of all three genes was increased by the HHO treatment, with varying sensitivity: EaPAL2 > EaPAL1 > EaCA4H. Southern blotting suggested that there is a third member of the PAL gene family in this species.
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