Feature selection is done according to improved mutual information formats that is verified to have superior accuracy rate,recall rate and F1 value through three kinds of methods to categorize text,thereby the validity of improved mutual information formats is verified.

To combine the Accuracy Rate and Check-whole Rate,F1 test value is proposed.

This paper reviewed the heterosis performance of cotton,the research and application of insect-resistant hybrid cotton of F_1 and F_2 generation,and it also analyzed its application prospect and the existing problem in its application.

The effects of four cultivation factors(planting density,N,K and DPS application) on fiber quality of F_1 and F_2 generation of transgenic hybrid cotton were studied by means of quaternary quadratic regression rotational combination design.

The F 1 heterosis and fertility of combinations of LH422 or 02428 with Indica or Japonica and combinations of Indica with Japonica were inspected in this test.

Results: Eight saponins were obtained and their structure were identified as Rg_ 1(1), Rg_ 2(2), 20(R)-Rg_ 2(3), Rd(4), Re(5), Ginsenoside Ⅲ.

Segregation of RAPD markers in F1 generation of Pinctada fucata family;

Result: Photosynthetic area, content of chlorophyll, net photosynthesis and yield of F1 generation are higher than those of the parents; chla/b rate is lower; growth is almost the s.

The genetic analysis of eight main characters showed that the main characters of nut of F1 generation were separated complicatedly and widely, which belonged to quantitative character heredity controlled by multigenic.