抗虫耐除草剂棉花生存竞争能力研究

Study on Survival Competitive Ability of Insect-and Herbicide-Resistant Cotton

本试验对抗虫耐除草剂棉花639017、当地棉花冀棉106在两种土壤类型条件下开展生存竞争能力研究。结果表明:正常播种条件下,抗虫耐除草剂棉花和冀棉106在大坝沙壤土出苗率低于5%,在试验基地壤土出苗率低于10%,两种土壤类型下,棉花覆盖度均远低于杂草覆盖度,棉花株高仅20 cm左右,未完成正常生长发育。在地表撒播试验中,试验棉花均未出苗。另外栽培地竞争试验中,抗虫耐除草剂棉花株高及产量均低于冀棉106,部分生育期差异显著。表明:外源基因的导入并未增强抗虫耐除草剂棉花的生存竞争能力,因此,抗虫耐除草剂棉花无杂草化风险。

The survival competitive ability of insect -and herbicide-resistant cotton 639017 and local cotton Jimian 106 were investigated in two soil types .The results showed that , under normal sowing condi-tions, the emergence rates of two cotton varieties were below 5%and 10%respectively in dam sandy loam soil and test site loam soil .The coverage degree of cottons was significantly lower than that of weeds .And the plant height was only 20 cm,so the normal growth and development was not finished .Broadcast sowing on the sur-face of two soil types , all cotton seeds couldn ’ t germinate .In cropland competition test , the height and yield of insect-and herbicide-resistant cotton were both lower than those of Jimian 106 , and the differences were significant in some growth periods .The results indicated that the introduction of exogenous gene didn ’ t en-hance the survival competitive ability of insect -and herbicide-resistant cotton , thus it had no risk of turn-ing into weeds .