Department of Agronomy, Chungnam National University, 220 Gung-Dong, Yuseong-Gu, Daejeon, 305-764, Korea.
J Chem Ecol. 2010 Aug;36(8):914-22. doi: 10.1007/s10886-010-9829-8. Epub 2010 Jul 8.
Sorgoleone, found in the root exudates of sorghum [(Sorghum bicolor (L.) Moench], has been a subject of continued research. Sorgoleone production in grain sorghum roots was investigated under different growth conditions. Methanol was the most effective solvent for extracting sorgoleone from grain sorghum roots. Sorgoleone production is high in young developing plants. The maximum concentration (microg mg(-1) root dry weight) was produced in 5-d-old seedlings; beyond this age, production declined. However, considering both root weight and sorgoleone content per seedling, 10-d-old seedlings had the highest total amounts (microg). Compared with the control, sorgoleone content increased 6.1, 8.6, and 14.2 times when sorghum seeds were treated with auxins, Hoagland solution, and a combination of auxins and Hoagland solution, respectively. Among the innate immunity response elicitors, cellulose (an elicitor of plant origin) stimulated higher sorgoleone production than the others, and it produced 6.2 times more sorgoleone than the control. Combined treatment of sorghum seeds with half strength Hoagland solution and 5 microg ml(-1) of IBA significantly increased both root growth and sorgoleone content in sorghum seedlings.
高粱根渗出物中的高粱醇索（Sorgoleone）一直是持续研究的课题。研究了不同生长条件下高粱根中高粱醇索的产生情况。甲醇是从高粱根中提取高粱醇索的最有效溶剂。在幼嫩的发育植物中，高粱醇索的产量较高。在 5 日龄的幼苗中产生的浓度最高（μg mg(-1)根干重）；超过这个年龄，产量下降。然而，考虑到每株幼苗的根重和高粱醇索含量，10 日龄的幼苗具有最高的总量（μg）。与对照相比，用生长素、Hoagland 溶液和生长素与 Hoagland 溶液的混合物处理高粱种子后，高粱醇索的含量分别增加了 6.1、8.6 和 14.2 倍。在先天免疫反应激发剂中，纤维素（一种植物来源的激发剂）比其他激发剂刺激产生更高水平的高粱醇索，比对照产生的高粱醇索多 6.2 倍。用半强度 Hoagland 溶液和 5μg ml(-1)IBA 联合处理高粱种子，显著增加了高粱幼苗的根生长和高粱醇索含量。
