有机胺在低温下对小麦种子萌发和幼苗根系活力的影响

摘要

[目的]研究不同低温条件下有机胺(PIAB)对不同冬小麦品种发芽和幼苗根系活力的影响.[方法]在3个低温(5、10、15℃)处理下,用0、10、20、50、100 mg/L不同浓度的PTAB对小麦进行浸种和叶面喷洒处理,考察对2个冬小麦品种种子萌发和幼苗根系活力的影响.[结果]PTAB对不同低温下不同冬小麦品种的发芽势、芽长、平均根长、最大根长和根活力都有促进作用.而且对2个冬小麦品种的影响趋势一致.在5℃低温下以浓度50 mg/L处理效果最好,在10 ～ 15℃低温下以浓度10 ～20 mg/L处理的效果最好.PTAB对供试的冬小麦抗寒性均有影响,在不同低温下PTAB起到促进生长和抑制生长作用的浓度有区别,表现出处理温度范围内温度越低时,PTAB的浓度越高,效果越好；温度增高时,PTAB的浓度比较低时效果好.高浓度的PTAB对根的生长有抑制作用.[结论]在低温胁迫下,适宜浓度的PTAB对小麦的发芽和幼根生长均有促进作用.%[Objective] The effects of the organic amine (PTAB) on the seed germination and root vigor of different winter wheat varieties under the different low temperature were studied. [ Method] Under the low temperature of 5,10 and 15 ℃ ,the wheat was made for the seed soaking and leaf spraying treatment with the different PTAB concn. (0,10,20,50,100 mg/L)to investigate the effect of PTAB on the seed germination and root vigor of the seedlings in 2 winter wheat varieties. [ Result]PTAB had the promoting effect on the wheat germination energy,sprout length,average root length,maximum root length and root vigor under different low temperature and had the similar effects on the two wheat varieties. The treatment with 50 mg/L PTAB under 5℃ could get best effect and that with 10-20 mg/L PTAB under 10 -15 ℃ could also get best effect. PTAB had the effect on the cold resistance of all the tested winter wheat varieties. The concn. That PTAB played the promoter action and the inhibitory action under different low temperature was different. In the test temperature range,when the temperature was lower,the PTAB with higher concn. Could get better effect and when the temperature was increased,the PTAB with lower concn. Could get better effect. The PTAB with high concn. Had the inhibitory action on the growth of the root. [Conclusion] Under the low temperature,PTAB with suitable concn. Had the promoting effect on the seed germination and young root growth of the wheat.