柠条平茬处理后不同组织游离氨基酸含量

选择12株30年生的老年柠条作为研究对象,之后随机对6株进行平茬处理,其余6株未破坏的植株为对照,在植物旺盛生长期,对平茬后当年生萌蘖株与未破坏对照株根、茎、叶中17种常见游离氨基酸含量进行了分析比较,以期从氨基酸的角度对柠条萌蘖的再生生长进行认识。结果显示,游离氨基酸含量在对照和平茬萌蘖柠条叶和根中处理间的差异远大于茎间差异;在生长季的座荚期,萌蘖株叶中天门冬氨酸、苏氨酸、丝氨酸、丙氨酸、缬氨酸、亮氨酸、酪氨酸、组氨酸、精氨酸,根中天门冬氨酸、丝氨酸、缬氨酸、胱氨酸含量为对照株的1.5倍以上;成熟期,萌蘖株叶中天门冬氨酸、苏氨酸、丝氨酸、谷氨酸、酪氨酸、苯丙氨酸、精氨酸、胱氨酸,根中天门冬氨酸、丝氨酸、缬氨酸、组氨酸、精氨酸的含量也达到对照的1.5倍以上。脯氨酸在座荚期对照株叶和茎中含量显著高于萌蘖株,成熟期处理间差异不显著,其含量受降雨和叶含水量影响显著,在植株体内起着重要的渗透调节作用。若不计脯氨酸含量,萌蘖株的根和叶中其余16种游离态氨基酸含量之和分别是对照株的2.0和2.7倍之多。由此可见,生长季叶和根中较高的游离氨基酸含量为萌蘖柠条快速合成其地上组织和实现生物量积累提供了较好的物质条件,是平茬后柠条萌蘖株迅速再生生长的重要机制之一。

Free amino acid content in different tissues of Caragana korshinskii following all shoot removal

Caragana korshinskii K.,a dominant member of desert flora in north-western China,is often subjected to aboveground shoot damage,such as grazing,clipping,trampling or wind throw,but as a resprouter shrub,it has a strong ability to regrow following damage and is very successful in its rapid recovery.This sprouting growth plays an important role in maintaining and regenerating the population and contributes to controlling desertification in this area.However,the mechanisms underlying the rapid growth have not ...