The Study On The Hybrid Of Scleroderma Sichuanensis Xiao And Scleroderma Guaui Xiao

Hybrid is to cultivate new varieties of important ways superior. Scleroderma sichuanensis and Scleroderma guaui on the traits have not been systematically compare in the last Management, but the two found in different parts of the natural enemies of the environment may have different ability to adapt.In recent years, Scleroderma for the problems in artificial breeding, through Scleroderma sichuanensis and Scleroderma guani hybrid, inspection and parasitic effects, and by Simulate a natural environment searching of Scleroderma to test the Scleroderma hybridization in forest control effect. The major findings are as follows:Scleroderma sichuanensis and Scleroderma guani can be hybrid, hybrid resulting from fertile females and fertile males, and fertility of F1 generation of Scleroderma sichuanensis and Scleroderma guani can backcross. And produce normal backcross. F1 generation of selfing can produce F2.1) Hybridization of the parasitic effects and the impact of development durationScleroderma sichuanensis's development duration of 44.8±3.68 days,for the Scleroderma guani 43.4±3.27 days; orthogonal Flof 39±2.98 days, anti-cross Fl of 38.9±2.42 days. Reciprocal F2, respectively,38.5±3.87 days,38±2.36 days. Compared the F1 and F2, development duration did not change significantly. No significant difference between orthogonal and anti-cross. Can be drawn:The hybrid can reduce the development of Scleroderma duration.In each developmental period, F2 generation of pre-eggs is significant less than Scleroderma sichuanensis and Scleroderma guani Xiao et Wu. other duration was not significant. Reason may be through hybridization, increased Scleroderma viability, making Scleroderma quickly adapt to the environment, to parasitic and prepare to lay eggs. May also linked to the changing with the F2 of sensors. Changes in sensor lead to odor in parasitism on host sensitivity increased to quickly parasitic, ready to lay eggs.Parasitic effects of hybrids has increased. Scleroderma sichuanensis parasitic rate of 78%, Scleroderma guani 85%. Reciprocal F1 generation were 88.83% higher than the parasitic rate of Scleroderma guani. F2 and F1 of little difference. Backcross progeny of parasitic effects and Sichuan hardcover, guani control was not significant. Can be seen, better than the parasitic offspring inbreeding populations.2) the amount of hybridization effects on the Scleroderma offspringScleroderma in the quantity of offspring to Scleroderma guani with the largest, followed by hybrid F1 generation. the reciprocal cross F1 living in Scleroderma sichuanensis with Scleroderma guani. The F2 generation of a hybrid offspring lowest, and significantly lower than Scleroderma guani. No significant difference in reciprocal cross. Hybrid offspring hatching and emergence rate highter than Scleroderma sichuanensis with Scleroderma guani. Scleroderma in the amount of backcross with Scleroderma sichuanensis, Scleroderma guani was not significant.3) the impact of hybridization on the crawling speedThe speed of hybrids decreased on crawling speed. F2 was somewhat lower than F1. The reason may be due to hybridization, that hybrids changes in the sensor area. Changes in sensor leading to the sensitivity enhancement of the odor in crawling process, and increased attention to smell, making the speed decreased. Backcross crawl speed has no significant changing4) The impact of hybridization on search capabilitiesHybrids have increased the search capabilities. That F2> F1>not cross. Hybrids improve the search capability, reflects the hybrid rejuvenation, by hybridization, to reduce inbreeding, optimization Scleroderma parasitic capacity, improve the Scleroderma search capabilities on the beetles; also may associated with Scleroderma antennal sensilla changed. Hybrids increase the surface area of new sensor, may increase their sensitivity to the odor, making its search capabilities improved. F2 has the most powerful search capabilities, may also is associated with long conical sensor, cylindrical sensor, the apparent increase in board-type sensor.5) The hybridization effect of antennal sensillumHybridization to Scleroderma changes of antennal sensilla. Fl and F2 generations on behalf of the ampullaceous sensillum disappeared, with the emergence of new sensors. The location of the new sensor quite the ampullaceous sensillum. F1 generation of new sensorⅠ,Ⅱ's surface area more than the ampullaceous sensillum, F2 generation of a new type of sensorⅢ,Ⅳ's surface area more than the new sensorⅠ,Ⅱ's. Found in the observation, F2 generation of long basiconic sensillum,cylindric sensillum, placodeum sensillum are significantly increased. Backcross of the sensor changed little, with the Scleroderma sichuanenis backcross of sensors close to the Scleroderma sichuanensis, with the Scleroderma guani backcross of sensors close to the Scleroderma guani. Antennae in the observation did not find the emergence of a new sensilla.