According to quite a number of research results, this review first made it clear that plant hormones could transport from other organs to cotton boll through phloem.

The results showed that:①According to its variability,the cotton boll quality charaters could be divided into 3 types.

The results showed as follows: cotton bolls volume and protein content in seed were significantly increased by nitrogen application.

Effect of Nitrogen Fertilizer Application on Development of Boll and Fiber Quality in High Fiber Quality Cotton

The CCRI 29 and 33B were sowed in three different dates (4/15, 4/21 and 4/29) and the dynamics of dry matter accumulation of boll shell and seed cotton with different parts of the cotton plant (upper, middle, lower) were examined, respectively.

During the development of the bolls ,the increment of the single boll of transgenic insect resistant hybrid cotton line Sukang 102 lies on ,according to the average of 1997 and 1998 ,the dry weight of fibre increase by 16.

Study on spatio-temporal distribution of cotton bolls based on different application schedule of organic fertilizer;

An optimal of multiple factorial experiment is applied for the effect of sowing date, planting density and nitrogen applying rate on spatio-temporal distribut ion of cotton bolls are studied by using hybrid cotton variety Nongza62,in orde r to find out an approach to high yield culture in bollworm-resistant hybrid co tton.

The ubiquitin gene of Helicoverpa armigera single-nucleocapsid nucleopolyhedrovirus(HaSNPV) was amplified by PCR.

Digestion of Helicovrtpa armigera nuclear polyhedrosis virus(HaSNPV Hubei isolate)with 11 restrictionendonucleases,BamH Ⅰ,BstE Ⅱ,EcoR Ⅰ,ECoR Ⅴ,Hind Ⅲ,Kpn Ⅰ,Pst Ⅰ,SalⅠ,SstⅠ,Xba Ⅰ andXho Ⅰ resulted in 10, 12, 22,21, 13, 6, 6, 40, 6, 21 and 6 fragments,respectively.