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Title:: Effects of Shading Treatment on Growth Development and Physiological Characteristics of Oncidium

Author(s):: LUO Yuanhua1; 2; 3; FANG Nengyan1; 2; 3; LIN Rongyan1; 2; 3; ZHONG Huaiqin1; 2; 3; HUANG Minling1; 2; 3; (1.Crop Research Institute,Fujian Academy of Agricultural Sciences,Fuzhou,Fujian 350013;2.Flower Research Center,Fujian Academy of Agricultural Science,Fuzhou,Fujian 350013;3.Fujian Engineering Research Center for Characteristic Floriculture,Fuzhou,Fujian 350013)

Keywords:: Oncidium; shading treatment; growth development; physiological index

Abstract:: A cut flower cultivar of Oncidium ‘Jinhui’ was used as material.The growth development and physiological characteristics of ‘Jinhui’ were studied under the shading rates of 60%,70%,80% and 90%,respectively.The relationship between the growth development and physiological characteristics of cut flower Oncidium and the light conditions was analyzed in order to provide reference for screening appropriate light conditions.The results showed that under persistent 60% shading rate condition,the length of peduncle significantly was reduced.And strong light result in significant decrease of the chlorophyll content in the summer,while the relative electrical conductivity increased significantly.Under persistent 90% shading rate condition,the contents of soluble sugar and reduced sugar in stems and leaves decreased significantly,and the circumference of pseudobulb,flowering rate,inflorescence length,fork number and number of flowers also evidently decreased.The persistence of 70% shading rate resulted in the highest flowering rate,inflorescence length,branching number and number of flowers,and strong light in summer led to the highest accumulation of soluble sugar and reducing sugar,which was conducive to the cultivation of cut flowers.