Study On Evaluation Of Cucumber Germplasm Resources With Low Pesticide Residue Content

Pesticide residues in vagetable not only impact earning foreign exchange and but also influence on consumer health. Utilizing 28 Cucumber plant as materials,3 pesticides (Deltamethrin, Propamocarb, Myclobutanil)were sprayed on experiment cucumber plants at the same time. The fruits were plucked, and their pesticide residue contents were determined and analyzed by gas chromatography. The cultivars or lines with pesticide-resistance had been screened, and the relative resistance mechanism was studied by morphological characteristic and biological peculiarity. The main results were as fellows:1.Definituding botanical modality indicators of cucumber germplasm resources with low pesticide residues content.We gained reference indicators of low prsticide residue, varieties with low prsticide residues surface character are green, pendulous leaf stance,low indention edge shape and less leaf area;high prsticide residues surface character are olive-drab color smooth leaf stance,undulant edge shape and biggish leaf area.2.Establishing indicator system of cucumber germplasm resources with low pesticide residues content.There are remarkable correlation between leaf area,tendril thick,critical surface tension and Pesticide residues content,they can act as critical index.Establishing a indicator system regression equation about evaluating cucumber germplasm resources with low pesticide residues content. The equation is:Y=-0.4529+ 0.0004 X₁+ 0.0007 X₂+ 0.0070 X₃Thereinto: Y: Pesticide residues; X₁: Leaf area; X₂: Tendril thick; X₃: critical surface tensionThe regression equation can be used to evaluate cucumber germplasm resources with low pesticide residues content.3.Screening cucumber varieties and germplasm resources with low Pesticide residues content.We gained approximately connection between pesticide residues content and type .There are 9 germplasm resources with low pesticide residues content.4. Irrespective figure index of pesticide residue.Shape,wax content,stomatal density of leaf and length, width, tegument color, burl density of cucumber fruit can not be critical indicators of cucumber germplasm resources with low Pesticide residues.