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Isolation and identification of two phytotoxic compounds from the medicinal plant Cassia alata L.
Weed Biology and Management ( IF 1.4 ) Pub Date : 2020-01-26 , DOI: 10.1111/wbm.12190
Krishna Rany Das 1, 2 , Keitaro Iwasaki 3 , Kiyotake Suenaga 3 , Hisashi Kato‐Noguchi 1
Affiliation  

Cassia alata (Caesalpiniaceae), an ornamental shrub, has many biological properties such as antifungal and antibacterial activities. Several bioactive and phytotoxic compounds have already been isolated from C. alata. Phytotoxic substances from plants have drawn attention as an alternative biological approach to control weeds. Thus, we conducted this research to explore other phytotoxic compounds in C. alata leaves. Aqueous methanol extracts of C. alata leaves strongly inhibited the seedling growth of broccoli, cabbage, cress, radish and rapeseed, in which the level of inhibition correlated with concentration. Two active compounds were isolated through chromatographies and identified using spectral data as (S)‐4‐(3‐hydroxybutyl)phenol [(+)‐rhododendrol] and (E)‐4‐((1R,4R)‐4‐hydroxy‐2,6,6‐trimethylcyclohex‐2‐en‐1‐yl)but‐3‐en‐2‐one [3‐hydroxy‐α‐ionone]. These two active compounds inhibited the growth of cress seedlings in a concentration‐dependent manner. The required concentrations for 50% growth inhibition (I50 value) of cress seedlings were 192.0–296.1 μM for (+)‐rhododendrol and 132.4–195.3 μM for 3‐hydroxy‐α‐ionone. These results indicate that the two phytotoxic compounds play a part in the phytotoxic activity of C. alata leaves.

中文翻译:

药用植物决明子中两种植物毒性化合物的分离与鉴定

决明子(Caesalpiniaceae)是一种观赏灌木,具有许多生物特性,例如抗真菌和抗菌活性。已经从阿拉维梭菌中分离出了几种具有生物活性和植物毒性的化合物。来自植物的植物毒性物质作为控制杂草的替代生物方法已引起关注。因此,我们进行了这项研究,以探索C. alata叶片中的其他植物毒性化合物。C. alata叶片的甲醇水溶液提取物强烈抑制西兰花,卷心菜,水芹,萝卜和油菜的幼苗生长,其中抑制水平与浓度有关。两种活性化合物通过色谱法分离和鉴定使用光谱数据如(小号)-4-(3-羟基丁基)苯酚[(+)-杜鹃花]和(E)-4-((1 R,4 R)-4-羟基-2,6,6-三甲基环己基-2-en-1 -yl)but-3-en-2-one [3-hydroxy-α-ionone]。这两种活性化合物以浓度依赖的方式抑制水芹幼苗的生长。水芹幼苗50%生长抑制所需的浓度(I 50值)为(+)-杜鹃花为192.0–296.1μM,3-羟基-α-紫罗兰酮为132.4–195.3μM。这些结果表明,两种植物毒性化合物在C. alata叶片的植物毒性活性中起作用。
更新日期:2020-01-26
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