烟草自毒效应的品种间差异研究(英文)

Investigation on difference in auto-toxicity among tobacco cultivars

利用生物测试法研究8个烟草品种(系)根系分泌物的自毒效应。结果表明:大多数供试烟草品种的幼苗鲜质量、干质量、最大叶片长和根长随着根系分泌物浓度的升高而减少,且品种间差异明显,其中黔西1号在稀释1倍的水平下,以上生长指标抑制率分别为63.3%、34.3%、42.4%和30.8%,居各品种之首;但新品系1号表现为以上生长参数均随着提取液浓度的升高而增大,在稀释1倍水平下生长促进率分别为13.0%、51.8%、13.0%和16.7%;此外,新品系7号、1号和品种云烟85和春雷3号的发芽率受根系分泌物的促进,而其他品种则受抑制;生物测试结果显示,在供试的8个品种中,自毒作用以新品系1号最弱,黔西1号最强。可见,自毒作用在烟草品种间差异明显,栽培上应选择适宜的烟草品种以减少自毒作用引起的连作障碍。

The differences among eight tobacco culitvars or lines （Nicotiana tabacum） in auto-toxicity of root exudates were investigated using bioassay. Root exudates of the eight tobacco cultivars or lines were collected and used to determine the effects of them on seed germination and seedling growth. The results showed that for most cultivars, fresh and dry mass, leaf and root length were increased at low concentration of exudate and reduced at high concentration of one. A cultivar, Qianxi 1 showed the greatest inhibition for all growth parameters above. While the breeding line, No. 1 was quite particular in its response to root exudate, in that all growth parameters showed increase, even under the highest concentration of root exudate. Germination rate of the new lines No.7, No. 1 and cultivars＇Yunyan 85 and Chunlei 3 were promoted, while that of other concluded that that the auto-toxicity differs among breeding program to develop the cultivars with less cultivars was inhibited by root exudates. It may be tobacco genotypes, suggesting that it is possible in allelopathy.