欧泉 马云桐 王准 毛胜楠 杨淑茗



摘要 [目的]研究不同生育期桔梗对湿害逆境的生长指标响应。[方法]分别在苗期、拔节期、花期、果期对桔梗进行湿害处理,测定株高、主茎粗度、最大叶长、最大叶宽、分枝数、地上干重、地下鲜重、地下干重、总皂苷含量,比较4个生育期中生长指标的耐湿性差异。[结果]湿害处理下,不同生育期桔梗生长指标响应有所差异,耐湿性不同,拔节期耐湿性最弱。[结论]该研究为指导桔梗大田栽培提供理论依据。
关键词 桔梗;生育期;生长指标;耐湿性
中图分类号 S567.23+9 文献标识码 A 文章编号 0517-6611(2017)07-0109-03
Growth Response and Tolerance to Waterlogging Stress of Platycodon grandiflorum at Different Growth Stages
OU Quan, MA Yun-tong*, WANG Zhun et al
(The Breeding Base of State Key Laboratory of Resources Systems Research and Development Utilization of Chinese Herbal Medicines Constructed by the Ministry of Science and Technology and Sichuan Province, Pharmacy College, Chengdu University of TCM, Chengdu, Sichuan 611137)
Abstract [Objective] To study the effect of waterlogging stress on growth indexes of Platycodon grandiflorum at different growth stages. [Method] With the continuous waterlogging stress treatment to P. grandiflorum at seedling stage, jointing stage, flowering stage and fruit stage, plant height, stem diameter, maximum leaf length and width, number of branches, fresh mass on the ground, fresh mass and dry mass of underground part and content of total saponin were determined, and the differences of waterlogging tolerance were compared. [Result] With the continuous waterlogging stress treatment, the growth indexes varied in different growth stages and the tolerance to waterlogging stress was different.At the jointing stage, P. grandiflorum had the worst waterlogging tolerance. [Conclusion]The study provided a theoretical basis for guiding the field cultivation of P. grandiflorum under waterlogging stress.
Key words Platycodon grandiflorum;Growth stages;Growth indexes;Waterlogging tolerance
桔梗[Platycodon grandiflorum(Jacq.)A. DC]為桔梗科植物,干燥的根为传统大宗药材;具有宣肺、利咽、祛痰、排脓的功效[1]。桔梗尚有食用、观赏多种用途,出口日本、韩国等多个地区。商品桔梗以内蒙古、山东、安徽、江苏、四川等省(区)产量较大,南北皆可种植[2]。
湿害胁迫下,植物根系因缺氧而生长受限,造成其生理代谢紊乱,进而对植株生长发育进程造成一系列损伤[3-5]。在桔梗大田栽培过程中,长期水湿条件下,桔梗叶片逐渐卷曲,根部腐烂,并发根腐病等,影响其生长发育进程,最终导致桔梗品质及产量的下降[6-7]。当前,关于水湿逆境条件下桔梗的生理响应变化鲜见报道。该试验依据桔梗不耐水湿特性,结合四川地区多湿多雨特点,对水湿逆境下桔梗的生长指标变化进行研究,并做差异性评价,为建立川桔梗大田栽培管理规范提供理论参考。
1 材料与方法
1.1 试验材料与处理
于2015年10月份自四川省安岳县采集二年生桔梗种子,经成都中医药大学中药资源教研室马云桐教授鉴定,播种于成都中医药大学温室内。……