氮肥对胡麻茎秆木质素合成酶活性及其抗倒性的影响

Effects of nitrogen on oilseed flax stem lignin and relative enzyme and lodging resistance

为探讨氮肥调节胡麻抗倒伏性的机制,以试验区域种植面积较大的中抗杂交种陇亚杂1号为材料,于2012、2013两年通过不同施氮水平(0、112.5和225kg/hm2)试验,研究了氮肥对油用亚麻(胡麻)茎秆木质素含量、木质素合成相关酶活性、茎秆抗折力、倒伏指数及实际倒伏率的影响。结果表明,随着施氮量的增加,胡麻茎秆中木质素含量、木质素相关合成酶活性及茎秆抗折力呈现先增后降的态势。分析表明,木质素含量与PAL、TAL、CAD、4CL、POD酶活性及茎秆抗折力呈正相关,与倒伏指数和实际倒伏率呈负相关。适宜的施氮量增加了茎秆木质素含量、提高了相关合成酶活性,增强了茎秆抗倒伏能力。在本试验区同等肥力土壤条件下,以施纯氮量112.5kg/hm2为宜。

To understand the effects and physiological mechanism of nitrogen regulating lodging resistance,a field experiment was conducted using hybrid oilseed flax Longya 1 in 2012 and 2013. Under 3 nitrogen levels 0,112. 5 and 225 kg /hm2,the investigated traits were lignin contents,relative enzyme activities,snapping resistance,lodging index and actual lodging percentage. Correlation analysis showed that the lignin content of oil flax stem had a positive correlation with PAL,TAL,CAD,4CL,POD activities and snapping resistance,but had a negative correlation with lodging index and actual lodging percentage. Feasible nitrogen fertilizer increased the lignin content,related enzyme activities and lodging resistance. The recommened nitrogen rate for oilseed flax was 112. 5kg /hm2.