不同性状的棉花及其杂交F1代对棉铃虫的抗性

摘要/Abstract

摘要： 通过连续两年的田间试验，系统、全面地研究了棉花对棉铃虫(Helicoverpa armigera)的形态抗虫作用。研究结果表明：在小区试验条件下，以百株累积卵量、百株平均幼虫量及百株平均蕾铃受害量为考察指标，红叶可使危害减轻28.1%、31.45%和36.O%；鸡脚叶可使其下降19.0%、25.4%和28.4%；窄卷苞叶使其降低25.8%、32.9%和34.0%；光叶使各指标分别降低32.7%、35.1%和37.3%。高棉酚(油腺)抗性主要表现为对幼虫的抗生作用，使幼虫量下降了45.1%，使蕾铃受害量下降了51.4%。此外，研究还表明，两种抗虫性状的抗性效果有累加作用，鸡脚叶与红叶联合作用使三项指标分别下降达48.3%、55.2%和57.9%；红叶与窄卷苞叶则使危害减轻了52.7%、58.3%和60.6%；具有光叶与较密油腺两个抗虫性状的品种受害可减轻29.9%、54.9%和58.3%。将一些具有相对性状的品种进行杂交，其F₁有不同的抗虫表现。红叶、鸡脚叶和光叶品种与其对照杂交后的F1代因在不同程度上保持了抗虫性状故能表现出抗性，而窄卷苞叶品种与其对照杂交后F1代苞叶正常，则未能表现出抗性。因小区条件限制了无蜜腺抗性的表达，无蜜腺小区未表现出明显差异。

关键词: 棉花, 棉铃虫, 形态抗虫

Abstract: Based on two years field trials, the morphological resistance of cotton lines to cotton bollworm Helicoverpa armigera (Htibner) were analysed. The results showed that the three indices, namely, the accumulated eggs, mean larval number and damagedsquare+boll number/100 plants, in the plots of cotton lines having red leaf, okra leaf, and frego bract were decreased by 28.1%, 31.45% and 36.0%; 19.0%, 25.4% and 28.4%; and 25.8%, 32.9% and 34.0% in comparison with the check plots, respectively. The larval number and damage of square and boll of those possessing high oil glanddensity, I.e. rich in terpenoid contents, were 45.1% and 51. 4% lower than the check plots ,respectively. There were coordinated action in those having both okra and red leaf, red leaf and frego bract or glabrous leaf and denser oil gland number characters, and thethree indices of these combinations were 48.3%, 55.2% and 57. 9%;52. 7%, 58.3% and 60.6%; and 29.9%, 54. 9% and 58. 3% lower than the checks respectively. The F₁ hybrids of the check separately crossed with red, okra or glabrous leaf lines had kept their own resistance to cotton bollworm in various degrees, while the bract of F1 crossed with frego leaf line turned normal and no resistance expressed. Possibly owing to the narrow condition of plot, the cotton lines without (outside flower) nectary glands did not show resistance.

Key words: cotton, cotton bollworm, resistance to insect

吴立峰蔡青年张青文. 不同性状的棉花及其杂交F1代对棉铃虫的抗性[J]. , 1997, 40(-1): 103-109.

Wu Lifeng Cai Qingnian Zhang Qingwen. ON THE RESISTANCE OF COTTON LINES HAVING DIFFERENT MORPHOLOGICAL CHARACTERS AND THEIR F_l HYBRIDS TO COTTON BOLLWORM[J]. , 1997, 40(-1): 103-109.

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