【摘要】 研究了酸性(pH5.1)和近中性(pH6.4)壳聚糖溶液引发4个玉米种子材料后,对发芽和幼苗生理特性的影响.结果表明,两种酸度壳聚糖溶液引发都能显著提高4个玉米材料的发芽势,缩短平均发芽时间,增加苗高和叶绿素含量;3种玉米新种子引发后的发芽率与对照无显著差异,但超甜3号陈种子处理低于对照.pH5.1壳聚糖引发处理后,苏玉1号和超甜3号幼苗的POD活性显著提高,MDA含量显著降低;超甜3号陈种子POD活性显著降低,MDA含量处理与对照没有显著差异;玉米幼苗的CAT活性与对照无显著差异.表明,壳聚糖可作为一种新的引发剂用于处理玉米种子,同时两种酸度壳聚糖溶液引发处理间无显著差异,均可提高玉米种子的活力.更多还原

【Abstract】 The effects of seed priming with acidic(pH5.1) and near neutral(pH6.4) chitosan solutions on seed germination and physiological characteristics of seedling were investigated using four maize materials.The results showed that priming treatments with two acidic chitosan solutions significantly enhanced the energy of germination,reduced mean germination time and increased shoot height and chlorophyll content.There were no significant difference in germination percentage between primed new seeds of three materials and un-treated control.The germination percentage of old seeds of Chaotian No.3 was,however,lower than that of the control.The POD activity and MDA content of the shoots of Suyu No.1 and Chaotian No.3 were obviously increased and decreased respectively after priming with pH5.1 chitosan solution.The POD activity was significantly decreased,and MDA content had no significant difference in the shoots of Chaotian No.3 old-aged seeds compared to the control.Concerning the CAT activity in the shoots of the three maize materials,including old-aged seeds,there were no markedly differences between the treatments and the control.Thus,it seems that chitosan is a new promising priming material for maize seed treatment,and no significant difference was found between the two acidic chitosan solutions and both are efficient in improving vigor of maize seeds.更多还原