小麦茎秆木质素代谢及其与抗倒性的关系

以抗倒性不同的6个小麦品种为材料，观测了茎秆基部第二节间的木质素含量及苯丙氨酸转氨酶(PAL)、酪氨酸解氨酶(TAL)、肉桂醇脱氢酶(CAD)和4-香豆酸: CoA连接酶(4CL)活性以及不同时期茎秆抗折力和倒伏指数的变化，探讨木质素含量与抗倒伏能力的关系。不同小麦品种的茎秆木质素含量存在明显差异。茎秆抗折力大、倒伏指数小的品种(济麦20和济麦22)，其茎秆木质素含量高，PAL、TAL、CAD和4CL活性强。相关分析表明，茎秆木质素含量与实际倒伏率呈显著负相关(r = -0.83, P<0.05)；与抗折力呈显著正相关(r = 0.86, P<0.05)；PAL、TAL和CAD活性与木质素含量呈显著正相关(r =0.78, 0.77, 0.85, P<0.05)，4CL活性与木质素含量呈不显著正相关(r =0.39, P>0.05)。研究表明，较高的PAL和CAD活性是木质素含量高的酶学基础，茎秆木质素含量可作为小麦品种抗倒伏性评价的一个重要指标。

Relationship between Lignin Metabolism and Lodging Resistance in Wheat

As a component of cell wall,lignin is believed to be relevant to mechanical intensity of culm.In this study,we investigated the dynamic changes of lignin content and activities of four enzymes involved in lignin metabolism in culm as well as the snapping resistance and lodging index of wheat(Tritcum aestivum L.) to disclose the relationship between lignin content and lodging resistance.The lignin content and activities of phenylalanine ammonia-lyase(PAL),tyrosine ammonia-lyase(TAL),cinnamyl alcohol dehydrog...