人类利用植物是从野生植物开始的,后来才逐渐发展到人工栽培.野生植物一旦被人们认识,就会变成宝贵的财富.橡胶树在十九世纪末叶以前还是不引人注意的野生植物,其用途被发现后迅速成为世界范围的重要工业原料植物.野生树种长角豆最初仅在饥荒年用其种子做代食,当发现种子中含有半乳甘露聚糖胶后,便广泛用于造纸、食品、印刷、医药工业.美国用爪尔豆生产的爪胶成为世界上的王牌胶,用于食品、橡胶、造纸、石油、 The use of plants by humans began with wild plants and later evolved into artificial plants, which, once known to the world, became a valuable asset. The rubber trees were unobtrusive wild plants until the end of the nineteenth century, After its discovery, it quickly became an important industrial raw material plant in the world.Wild tree species Carob was first used only as a substitute for its seeds in famine years, and was found to be widely used in papermaking when it was found that the seeds contained galactomannan gum, Food, printing, pharmaceutical industry. The United States with the production of claw beans claw gum to become the world’s trump card for food, rubber, paper, oil,