Growth-inhibitory activity of components in Cryptomeria japonica leaves against Robinia pseudoacacia

Abstract

Extracts obtained from Cryptomeria japonica leaves were tested for growth inhibition activity against Robinia pseudoacacia seeds, which is known as a representative invasive plant in temperate forests. Inhibitory activities against radicle and hypocotyl growth were found in hexane and ethyl acetate extracts but showed no or weak activity on seed germination. The extracts also showed inhibitory activity against Trifolium repens as a representative weed. The active extracts were fractionated by silica gel column chromatography and cryptomeridiol was isolated as an active compound. Comparison of activities between cryptomeridiol and βeudesmol indicated that the diol structure of the eudesmane skeleton was important in causing the inhibitory activities.

Variations in Essential Oil Chemical Composition and Biological Activities of Cryptomeria japonica (Thunb. ex L.f.) D. Don from Different Geographical Origins—A Critical Review

“…More recently, some other C. japonica bioactivities have been described. For instance, Tanaka et al [64] reported that chemical components of C. japonica leaves suppress the growth of invasive plants (Robinia pseudoacacia) and weeds (Trifolium repens), which are the largest competitor of agricultural crops, with negative impact on productivity.…”

A New Species of Biscogniauxia Associated with Pine Needle Blight on Pinus thunbergii in China

“…Pinus thunbergii (Japanese black pine) is native to Japan and Korea and is currently widely distributed in China due to its evergreen attributes, fast growth, and salinity tolerance [1]. It plays essential roles in ecological restoration, such as sand fixation and afforestation [2][3][4]. Despite the ecological effects, P. thunbergii in China were infected by many pathogens, which caused the wilt and mortality of pine trees.…”

Morphological and Phylogenetic Resolution of Diplodia neojuniperi Emerging Diplodia Top Dieback of Pinus thunbergii Parl. in China

“…(Japanese black pine) is a widely distributed pine species in China due to its graceful leaf shape, fast growth, and salinity tolerance, which originated from Japan and North Korea [6]. It plays essential roles in ecological restoration such as sand fixation, and environment afforestation [7]. However, in June 2020, a large area of P. thunbergii were observed to show discolored and withered needles in forests from Bazhong City, Sichuan Province, China.…”