若干生化指标与山羊草对禾谷缢管蚜抗性的关系

Relationship Between Several Biochemical Indexes and Resistance of Aegilops Species to Oat-bird Cherry Aphids(Homoptera:Aphididae)

报道小麦野生物种 9种山羊草 (Aegilopsbiuncialis,A .juvenalis,A .ovata ,A .kotschyivar.varianilis,A .tri aristata ,A .tauschii,A .vavilovii,A .crassa和A .ventricosa)对禾谷缢管蚜 (Rhopalosiphumpadi)的生化抗性机制。苗期山羊草总酚含量与对禾谷缢管蚜的抗性无关 ,丁布 (DIMBOA)含量与抗蚜性密切相关 ,禾谷缢管蚜内禀自然增长率同丁布含量呈显著负相关 (r=- 0 .76 0 ) ;成株期叶片可溶性糖和总酚含量与抗性无关 ,游离脯氨酸和丝氨酸含量与蚜虫内禀自然增长率呈极显著或显著正相关 (rm=- 0 .0 6 36 +0 .2 3xpro +1.982xser ) ,丁布含量与禾谷缢管蚜内禀自然增长率呈极显著负相关 (r=- 0 .819 ) ,低含量的游离脯氨酸和丝氨酸和高含量的丁布是野生山羊草物种抗禾谷缢管蚜的重要生化因子。

The biochemical mechanism of resistance of 9 Aegilops species including A.biuncialis, A.juvenalis, A.ovata, A.kotschyi var. varianilis, A.triaristata,A.tauschii, A.vavilovii, A.crassa and A.ventricosa in Triticeae to oat-bird cherry aphid (Rhopalosiphum padi) were reported for the first time. The results showed that the content of total phenols in seedling was not associated with resistance to this aphid. The level of DIMBOA was negatively related to intrinsic innate rate of increase (r m) of R. padi. Neither the solvable sugar nor total phenols in adult stage were associated with the level of resistance. However, the concentration of free proline and serine of leaf were positively related to r m of R. padi (r m =-0.0636+0.23xpro **+1.982xser*).The content of DIMBOA was highly negatively related to r m of R.padi (r=-0.819 **). The low level of free proline and serine and high concentration of DIMBOA can be regarded as important elements for resistance of Aegilops species to R. padi.