甜叶菊新品系的主要农艺性状及糖苷含量比较

目的]对4个甜叶菊品系的主要农艺性状、茎叶产量及糖苷含量进行比较,为不同用途的甜叶菊育种提供一定的依据。方法]对SR-1,SR-2,SR-3和SR-5共4个甜叶菊品系的株高、茎节长、一级分枝数、叶长、叶宽、叶长宽比和茎叶干重等进行考察,采用HPLC法测定其干叶ST和RA糖苷含量,并分析了各性状间相关关系。结果]4个品系间植株形态、茎叶产量及糖苷品质均存在显著差异,ST苷含量和茎叶产量最高的品系为SR-5,RA苷含量和RA/ST值最高的品系为SR-2,综合RA苷含量和茎叶产量考虑,RA苷总量最高的为SR-3。茎叶产量同株高、茎节长、叶宽间相关显著。RA苷含量与干叶产量、干茎产量及茎叶总产量等呈显著负相关。ST苷含量则与各农艺性状间相关均不显著。结论]提高甜菊的产量会一定程度影响甜叶菊的品质,但仍有可能选出既高产,品质又符合生产所需的优良甜叶菊新品种。SR-5品系可作为较好的药用型甜叶菊品系,SR-2可用作糖用型甜叶菊育种材料。

Comparison on Main Agronomic Traits and Glucoside Content in Different Stevia rebaudiana New Lines

To provide theoretical basis for breeding good varieties of Stevia rebaudiana with different uses,some main agronomic characters,yield and rebaudioside（RA） and stevioside（ST） contents of 4 different S.rebaudiana new lines were studied.Plant height,node length,number of first branches,leaf length,leaf width,length/width ratio,dry leaf weight,dry stem weight and total dry weight were measured.RA and ST contents in leaves were determined by HPLC.Correlation analysis among agronomic characters,yield,RA and ST contents were carried on.The results showed that there were significant differences in basic agronomic characters,dry leaf and stem yield and RA and ST contents of 4 lines.SR-5 line was rich in ST and was the highest yield line.SR-2 line was rich in RA with highest RA/ST ratio.SR-3 line had the highest quantity of RA content when yield and RA content of per plant were considered.There were significantly positive correlations between dry leaf yield with plant height,with node length,with leaf width,and negative correlations between RA content with dry leaf yield（r=-0.94＊）,with dry stem yield（r=-0.90＊）,with total dry yield（r=-0.93＊）.While there were no correlations between ST content and agronomic characters.Improving yield may affect the qualities of Stevia rebaudiana in some content,however,it is still impossible to select out good new variety with high-yield as well as good-qualified.SR-5 line might be a good material for officinal Stevia rebaudiana breeding,while SR-2 for sweetener-use Stevia rebaudiana breeding.