Evaluation of Isoflavones as Allelochemicals with Strong Allelopathic Activities of Kudzu Using Protoplast Co-Culture Method with Digital Image Analysis

• 作者: Kentaro Kobayashi Hamako Sasamoto Yutaka Sasamoto Akifumi Sugiyama Yoshiharu Fujii
• 来源期刊: 美国植物学期刊(英文)
• 学科: 生物学
• 关键词: Allelopathy Bioassay DAIDZEIN ISOFLAVONE Protoplast Culture Puerarin
• 年，卷（期）: 2021,（3）
• 页码范围: 376-393
• 页数: 18页
• 分类号: Q94

摘要

The inhibitory allelopathic activity of </span><i><span style="font-family:Verdana;">Pueraria montana </span></i></span><span style="font-family:Verdana;">(Kudzu), and activities of two putative allelochemical isoflavones, puerarin and daidzein, were evaluated using the protoplast co-culture method with digital image analysis using lettuce as a recipient (DIA-PP</span><span style="font-family:""> </span><span style="font-family:""><span style="font-family:Verdana;">method). Cotyledon protoplasts of Kudzu were isolated using Cellulase R10 and Driselase 20 in 0.6 M mannitol solution. Optimal hormonal condition and density for growth of Kudzu protoplasts were surveyed. Medium for co-culture of Kudzu or isoflavones with lettuce protoplasts was 50 μl liquid MS basal medium containing 1 μM 2,4-dichlorophenoxyacetic acid, 0.1 μM benzyladenine, 3% sucrose, and 0.4 M or 0.6 M mannitol. Protoplast division of lettuce was strongly inhibited by Kudzu at a low density (10</span>^{<span style="font-family:Verdana;">4</span>}<span style="font-family:Verdana;">/ml). Slightly less inhibition by Kudzu on cell wall formation and yellow pigment accumulation stages of lettuce growth was also observed. Puerarin did not inhibit the growth of lettuce protoplasts at three growth stages but slightly stimulated growth at high concentrations. By contrast, daidzein, aglycon of puerarin, inhibited growth at three stages of lettuce protoplast growth and strongly inhibited cell division at 100 μM. Daidzein might be one cause of the strong inhibitory allelopathic activity of Kudzu. Grade of inhibitory activities w</span></span><span style="font-family:Verdana;">as</span><span style="font-family:Verdana;"> compared with th</span><span style="font-family:Verdana;">at</span><span style="font-family:Verdana;"> of other allelopathic plants including an invader plant and their allelochemicals studied using the DIA-PP method.