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植物第六激素也叫天半素。天半素属于甾醇类植物生长调节剂,其通用名为表油菜素内脂,商品名还有芸素内脂、BR-120,农乐利等。这种激素是由美国农业部农业研究中心农学家米切尔、导的研究组于70年代初首次从油菜花粉中发现的。又经过十年努力,美国农业部的化学家终于测定出其化学结构,与此同时,科学家们通过大量的试验,证明了该化合物和已发现的五大类植物激素完全不同。于是在已发现的生长素、赤霉素、细胞分裂素、脱落酸、乙烯五大类植物激素之后,又增加了一类新的植物激素,被称为“植物第六激素”。
Sixth plant hormones also known as days prime. Aloe vera is a steroid plant growth regulator whose common name is epibrassinolide, also known as thaumatin, BR-120, Nong Lali, and others. This hormone was discovered by rapeseed pollen in the early 1970s by a team led by Mitchell, an agronomist at the USDA Agricultural Research Center. After a decade of hard work, chemists at the U.S. Department of Agriculture finally determined their chemical structure. At the same time, scientists conducted extensive tests to prove that the compound is completely different from the five major classes of phytohormones that have been discovered. So in the found auxin, gibberellin, cytokinin, abscisic acid, ethylene five kinds of plant hormones, and then added a new class of plant hormones, known as the “sixth plant hormone.”