Study On Effects And Genetic Analysis Of Mini-cucumber Quality Character

The purpose of this paper is to discuss the function of cross breeding to improve cucumber quality and the effect of external factors on cucumber character.With mini-cucumber,Mici cucumber,their first filial generation and second filial generation as the material,the content changes of nutrient and aromatic compounds were studied.The effect of days after anthesis,Shape of fruit,treatment of Nitrogen and Potassium,fruiting node and light condition on cucumber character were also did.The results showed that:1.It was indicated by separating nutritional quality index and aroma determination of F2 that the contents of nutrients and aromatic compounds of F2-2, F2-3 and F2-5 were improved comparing with mini-cucumber.The content of F2's soluble protein and Vc were higher than mini-cucumber, soluble sugar was lower, but nutrients content of F2-5 among F2 was the highest.Theratio of characteristic aromatic compounds,2,6-nonadienal(E,Z)and 2-Nonenal,(E),was highest. The results showed that cross breeding could improve cucumber quality in some degree.2.Soluble sugar,soluble protein,Vc and free amino acids showed a trend of rise first then fall after anthesis.The content of soluble sugar rose steep at the third day after anthesis,the highest at the ninth day, but decreased gradually after the day.The lower the content of soluble protein was,the longer cucumber bred.The content of free amino acids ascended gradually at the third to ninth day after anthesis and had a trend of falling beginning the ninth day. The content of Vc went up gradually at the third to ninth day after anthesis, the highest at the twelfth day, declined after the twelfth day.3.The shape of cucumber is the important standard that people purchase and measure quality.Malformed fruits are common in the yield.The tests indicated that soluble sugar,soluble protein,free amino acids,Vc and soluble solids were lower than natural cucumber.Therefore, cultivation should be strengthened to avoid this phenomenon.4.Within the rages of nitrogen(0-900kg/hm2)and potassium(0-450kg/hm2), fruit firmness and soluble solids increased with fertilizer rate raising.The yield, soluble protein and free amino acids could be improved significantly by appropriately rising application rate and ratio of nitrogen,potassium,firmness and brittleness also be modified.But the increasing yield effect did not appear only by raising potassium.Partial application nitrogen was not good for Vc.The lower content of Vc,the higher application rate of nitrogen.Increasing nitrogen made soluble sugar decrease.Cucumber character declined,when application rate of nitrogen exceeded the rage of 900kg/hm2 potassium 450kg/hm2 Nutrient compounds decreased gradually with application rate increasing.5.Nutrient quality and fresh weigh at different fruiting nodes of the same plant were stationary.Soluble sugar,soluble protein, soluble solids,fresh weight had a trend of rise first then fall with fruiting node rising. But free amino acids and Vc did not too change.Each nutrient quality index showed differently at different nodes.The content of soluble sugar had a declining trend with the raising nodes from the fourth to eleventh.The content of soluble protein had a increasing trend,the biggest at ninth node,then decreased gradually.Through Vc of different nodes was different insignificantly,soluble solids changed prominently.The content of soluble solids went up stably with rising nodes.In all,the content increased and the highest from the tenth to twelfth,then descended.Fresh weight varied stably,the highest from the sixth to eleventh,and descended steep with rising nodes.Soluble solids were different insignificantly from the fourth to seventh nodes,the highest from the eighth to eleventh.The results showed that the cucumbers of too low or high nodes should not be harvested in the yield.Those from the sixth to eleventh were the best.6.Diffrent light intensity had an bigger effect on cucumber character.The results showed that soluble protein,soluble sugar, free amino acids,Vc,fresh weight and soluble solids decreased significantly after shading treatment. Nutrient compounds decreased with light intensity decreasing.