田七苗期生理性裂根及其发生规律

Physiological Crack Root and Occurrence Regularity in Panax notoginseng at Seedling Stage

关键词:  田七  生理性裂根  发生规律

Key words:  Panax notoginseng  split-root disease  occurrence regularity

摘要:

[目的]了解田七苗期裂根的发生规律以及相关影响因素,为制定裂根病的防治措施奠定基础。[方法]观察田七裂根的发生规律,采用侵染性病源检测法研究田七苗期裂根的发生原因,并研究生育期、生长年限、光照强度、播种深度和营养条件等因素对其发病率的影响。[结果]田七生理裂根主要集中发生在苗期,属非侵染性的生理性病害,根系膨大时期的管理不当导致其根部开裂;田七裂根性病害随着生长年限的增加呈下降的趋势,栽培3年后基本未见发病;发病率随着光照的增强显著提高;裂根现象的发生与施肥不当有关,合理施肥,增施钙、镁、锌、铁、硼等元素可以减少苗期裂根的发生。[结论]田七苗期出现的裂根是一种生理性病害,其发生与环境有密切联系。

Abstract:

[Objective] Studying the regularity of outbreak and related factors of physiologically split-root disease in Panax notoginseng at seedling stage to lay the foundation for the establishment of prevention and cure measures for split-root disease.[Methods] To observe the regularity of outbreak of physiologically split-root disease in Panax notoginseng, the cause of split-root disease in Panax notoginseng at seedling stage was studied by using infectious pathogen detection method,and the effects of the duration of growth,the growing years,the light intensity,the depth of planting and the nutrition conditions on the incidence were studied.[Results] The physiologically split-root disease in Panax notoginseng mainly occurred in the seedling stage,which was a non-infective physiological disease.The split-root disease was caused by improper management in the period of root expansion.With the increase of growth years,the physiologically split-root disease in Panax notoginseng showed a downward trend,and basically no disease occurred after 3 years of cultivation.The occurrence of split root increased significantly with the increase of light intensity and was related to improper fertilization.Rational fertilization,the application of calcium,magnesium,zinc,iron,boron and other elements could reduce the occurrence of split root at seedling stage.[Conclusion] The split-root disease appeared in Panax notoginseng at seedling stage is a physiological disease,and its occurrence is closely related to the environment.