Practicality of the suicidal germination approach for controlling Striga hermonthica
Practicality of the suicidal germination approach for controlling Striga hermonthica
复制标题
DOI：
10.1002/ps.4215
复制
发表时间：
2016-11-01
影响因子：
4.1
通讯作者：
Sugimoto, Yukihiro
中科院分区：
文献类型：
--
作者：
Samejima, Hiroaki;Babiker, Abdel Gabar;Sugimoto, Yukihiro
背景紫独脚金(Striga Hermonthica)，豆科植物，是一种重要的粮食作物专性根寄生杂草。这种寄生虫是一种丰富的种子生产者，在最初的感染开始后不久就形成了一个巨大的种子库。为了发芽，Striga种子需要在潮湿温暖的环境中进行预处理，然后暴露在外部刺激剂中。减少种子库的一种方法是在没有或远离寄主根的情况下人工诱导种子萌发。研究了一种新开发的发芽促进剂T-010在温室和田间人工稻瘟病菌侵染条件下的防效。配方T-010分别以0.1、1和10 kg ai ha(-1)的剂量施于盆栽土壤中，经适当灌溉处理后，稻瘟病出苗率可达94-100%。田间试验结果表明，与盆栽试验相同，配方T-010延缓和减少稻纵卷叶出苗33%，增加高粱地上部和穗部干重18.7~40.2%和187~241%。结论首次证明了用自杀性萌发防治稻瘟病菌的技术可行性。优化发芽促进剂的结构、配方和使用方案是进一步改进发芽促进剂技术的主要目标。(三)2016年化学工业学会
BACKGROUNDPurple witchweed (Striga hermonthica), Orobanchaceae, is an obligate root-parasitic weed of important cereal crops. The parasite is a copious seed producer, and a huge seed bank develops soon after the onset of the initial infestation. To germinate, a Striga seed requires a pretreatment in a moist warm environment and a subsequent exposure to an exogenous stimulant. One approach to reduce the seed bank is artificially to induce germination of the seeds in the absence of or away from the host roots. A newly developed germination stimulant for S. hermonthica, designated as T-010, was evaluated for efficacy in greenhouse and field experiments under artificial Striga infestation.RESULTST-010 displayed germination-inducing activity in soil. Formulated T-010 applied at 0.1, 1 and 10 kg ai ha(-1) to potted soil containing S. hermonthica seeds, previously conditioned by judicious irrigation, reduced Striga emergence by 94-100%. Results of a field trial showed that formulated T-010, at the same rates as for the pot experiment, delayed and reduced Striga emergence by 33% and increased sorghum shoot and head dry weight by 18.7-40.2% and 187-241% respectively.CONCLUSIONThese findings demonstrated, for the first time, the technical feasibility of suicidal germination for controlling S. hermonthica. Optimising structure, formulation and application protocol of germination stimulants should be the main goal for further improvement of the technology. (c) 2016 Society of Chemical Industry