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首页> 外文期刊>Plant biology >Responses of the weed Bidens pilosa L. to exogenous application of the steroidal saponin protodioscin and plant growth regulators 24-epibrassinolide, indol-3-acetic acid and abscisic acid
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Responses of the weed Bidens pilosa L. to exogenous application of the steroidal saponin protodioscin and plant growth regulators 24-epibrassinolide, indol-3-acetic acid and abscisic acid

机译：杂草上的Pilosa L.对甾体皂苷Protocioscin和植物生长调节剂的外源应用24-倍吡喃醇，吲哚-3-乙酸和脱落酸

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The exogenous application of plant hormones and their analogues has been exploited to improve crop performance in the field. Protodioscin is a saponin whose steroidal moiety has some similarities to plant steroidal hormones, brassinosteroids. To test the possibility that protodioscin acts as an agonist or antagonist of brassinosteroids or other plant growth regulators, we compared responses of the weed species Bidens pilosa L. to treatment with protodioscin, brassinosteroids, auxins (IAA) and abscisic acid (ABA). Seeds were germinated and grown in agar containing protodioscin, dioscin, brassinolides, IAA and ABA. Root apex respiratory activity was measured with an oxygen electrode. Malondialdehyde (MDA) and antioxidant enzymes activities were assessed. Protodioscin at 48-240 mu m inhibited growth of B. pilosa seedlings. The steroidal hormone 24-epibrassinolide (0.1-5 mu m) also inhibited growth of primary roots, but brassicasterol was inactive. IAA at higher concentrations (0.5-10.0 mu m) strongly inhibited primary root length and fresh weight of stems. ABA inhibited all parameters of seedling growth and also seed germination. Respiratory activity of primary roots (KCN-sensitive and KCN-insensitive) was activated by protodioscin. IAA and ABA reduced KCN-insensitive respiration. The content of MDA in primary roots increased only after protodioscin treatment. All assayed compounds increased APx and POD activity, with 24-epibrassinolide being most active. The activity of CAT was stimulated by protodioscin and 24-epibrassinolide. The results revealed that protodioscin was toxic to B. pilosa through a mechanism not related to plant growth regulator signalling. Protodioscin caused a disturbance in mitochondrial respiratory activity, which could be related to overproduction of ROS and consequent cell membrane damage.
机译：已经利用了植物激素及其类似物的外源性应用，从而改善了该领域的作物性能。 Protodioscin是一种皂苷，其甾体部分与植物甾粒子激素，芸苔类固醇有一些相似之处。为了测试Protodioscin作为芸苔类固醇或其他植物生长调节剂的激动剂或拮抗剂的可能性，我们比较了杂草物种Bidonsa L.与Protodioscin，芸苔类固醇，菌丝（IAA）和脱钙（ABA）进行治疗的反应。种子萌发并在含有Protodioscin，Dioscin，Brassinolides，IAA和ABA的琼脂中生长。用氧电极测量根顶点呼吸活性。评估丙二醛（MDA）和抗氧化酶活性。 Protodioscin在48-240亩m米抑制B. pilosa幼苗的生长。甾体激素24-呕血素醇（0.1-5μm）也抑制初级根的生长，但Brassicasterol无活性。浓度较高（0.5-10.0μm）强烈抑制茎的茎的强烈抑制。 ABA抑制了幼苗生长和种子萌发的所有参数。 Protodioscin激活初级根（KCN敏感和KCN - 不敏感）的呼吸活性。 IAA和ABA降低了KCN不敏感的呼吸。在Protodioscin治疗后，初级根部MDA的含量增加。所有测定化合物均增加APX和POD活性，24-倍匹吡吡啉醇最活跃。猫的活性由Protodioscin和24-倍溴丙醇苷刺激。结果表明，通过与植物生长调节器信号传导无关的机制，Protodioscin对B. pilosa毒性。 Protodioscin在线粒体呼吸系训中引起了一种干扰，这可能与ROS过量生产相关，并随后的细胞膜损伤。

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