Study Of Breeding Of Upland Cotton With High Fiber Quality, Multi-resistance And High Yield

The test mainly studies â‘  selection effects of hybrid generation under different environmental pressures;â‘¡ continuous selection effects of hybrid descendants with steady material in great groups and under high selection pressures;â‘¢ methods and effects of complex cross of multi-parents and insects resistance gene. The result suggests that great groups are continuously selected from different generation materials, under combination pressures of various environmental elements, that's to say. Under total pressures of the best micro ecological emironment and multi-elements adversity, against rich genetic background, and make all kinds of potential genes full expressed. And at last genotype is selected in keeping nith breeding objective. The cotton variety shan No. 4080 with good fiber quality, high yield and multi resistance is bred by means of selecting in good -adver cotton growing condition, created originally in the test through field practice. The result of Shan No.4080 in the regional variety test (8 provinces regions ) 20 times yellow River valley including Xinjiang cotton region (shows that the yield of line cotton before frost overfulyines 23.0 percent than CCRI12CK) , resists fusavrium nilt and rerticillinm nilt, endures drought and alkali, moderately resists Helicoverpa armigera, The field of artificial infection are continuously planted and the result are selected under great Helicoverpa armigera pressure, improving Helicorerpa armigera moderate resistance and verticillium wilt endurance to Helicorerpa armigera high resistance and rerticiuinm nilt resistance . The variety has been exarmied in Shaanxi in 2005. By transgenic material crossing with Shan No.4080, F₁ complexly crossing with No.CCRI 206 great groups are continuously tested by Kanamyoin marker gent, having bred transgenic Bt cotton Shan No. 204. The quality surpasses the breeding objective of ministry of Agriculture during 2003-2007. The yield of line cotton before frost in the regional variety test in Shaanxi orerfulfius 23.16 percent than 33B(CK), standing the first. And coordinates the relationship among. Insect and disease resistance, adversity resistance, superior quality and high yield, achieving the genetic improvement of transgenic Bt cotton. The variety has been submitted to Ministry of Agriculture, applying for practice in Shaanxi.