金线兰种苗质量分级标准研究

探讨金线兰种苗质量分级标准。测定金线兰组培苗的苗长、叶长、叶宽、叶片数、茎粗、茎节数、单株重等数量指标,进行相关性分析、主成分分析,确定金线兰种苗分级指标,并根据聚类分析数据、标准差数据制定分级标准,采用成活率进行分级验证。结果表明,苗长、茎粗及单株重是金线兰组培苗分级的主要指标,金线兰种苗分为3个等级,一级种苗苗长≥130mm,茎粗≥2.8mm,单株重≥1.3g,二级种苗苗长≥110mm,茎粗≥2.4mm,单株重≥1.0g,三级种苗苗长≥90mm,茎粗≥2.1mm,单株重≥0.6g。该分级标准为金线兰种苗繁育以及生产提供有效的理论依据。

Standards for Grading Anoectochilus roxburghii (Wall.) Lindl.Seedings

Standards for grading seedlings of Anoectochilus roxburghii (Wall.) Lindl.were studied.Factors includingplant height and weight,average length,width and count of leaves,stem diameter,andinternode countof a seedlingpropagated from tissues were analyzes on their interrelations and chemical compositions to select agradingsystem.Cluster and statisticalanalyses were performed to weigh those factors against the survival rate of the seedlings.The results indicated that the plant height and weight,as well as the stem diameter were the determining indicators for an effective grading.Three classifications were thus established:the 1st Grade to show a seedling height of ≥130 mm,a stem diameter of ≥2.8 mm,and a weight of ≥1.3 g;the 2nd Grade,a seedling height of ≥ 110 mm,a stem diameter of ≥2.4 mm,and a weight of ≥1.0 g;and,the 3rd Grade,a seedling height of ≥90 mm,a stem diameter of ≥ 2.1 mm,and a weight of ≥ 0.6 g.The proposed standards would allow a clearly definedevaluation on seedings in the breeding practices.