干旱区生态环境知识资源中心(Arid): 柠条平茬处理后不同组织游离氨基酸含量

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	柠条平茬处理后不同组织游离氨基酸含量
其他题名	Free amino acid content in different tissues of Caragana korshinskii following all shoot removal
	张海娜 1; 方向文 2; 蒋志荣 1; 冯彦皓 2
来源期刊	生态学报
ISSN	1000-0933
出版年	2011
卷号	31 期号:9 页码:2454-24e0
中文摘要	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。
英文摘要	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 been studied in concert.In this study,a total of 12 30-year-old shrubs were randomly selected from the C.korshinskii wood stand.For half of the selected plants,all shoots were cut 1 cm above the soil surface at the end of winter(resprouts),and the other half of the plants were untreated(control plants).At pod set(12th July)and seed maturity(16th August),roots,stems and leaves from resprouts and control plants were sampled to measure the 17 common free amino acids so as to determine whether the resprouts had higher free amino acid concentrations in plant tissues during the growing season.The results showed that the differences of the concentrations of the free amino acids between the treatments were more significant in leaves and roots than in stems.At pod set,the concentrations of most amino acids in leaves,such as aspartate(ASP)、threonine(THR)、serine(SER)、alanine(ALA)、valine(VAL)、leucine(LEU)、tyrosine(TYR)、histidine(HIS)and arginine(ARG),and the concentrations of ASP、SER、VAL and cystin(CYS)in roots were 1.5 times greater in resprouts than in control plants.At seed maturity,the concentrations of most amino acids in leaves,such as ASP、THR、SER、glutamic(GLU)、TYR、phenylalanine(PHE)、ARG and cystine(CYS),and the concentrations of ASP、SER、VAL、HIS and ARG in roots were still higher in resprouts than in control plants.As far as proline(PRO)was concerned,its concentrations in leaves and roots in resprouts were about two-thirds of those in controls at pod set,but there was no significant difference between treatments at seed maturity as the concentration of PRO in control plants decreased dramatically with more rainfall and an increase in leaf water content.The results suggested that PRO was an essential ingredient for osmotic regulation in this species under water deficit.With the exception of PRO,the total concentration of the other 16 free amino acids in leaves and roots in sprouts were 2.7 and 2.0 times greater than the controls,respectively.More free amino acids were available in leaves and roots in resprouts at each sampling time,which would provide essential resources for plant rapid regrowth and then contribute to aboveground biomass recovery.In conclusion,after shoot clipping,resprouts had higher free amino acid concentration in leaves and roots to increase the supply of nutrient for current-year shoot growth,which may be one of the important mechanisms underlying regrowth following the removal of all shoot.
中文关键词	游离氨基酸 ; 柠条 ; 平茬 ; 再生生长
英文关键词	free amino acid Caragana korshinskii K. clipping regrowth
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:4289519
来源机构	兰州大学 ; 甘肃农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226919
作者单位	1.甘肃农业大学林学院, 兰州, 甘肃 730070, 中国; 2.兰州大学, 干旱与草地生态教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	张海娜,方向文,蒋志荣,等. 柠条平茬处理后不同组织游离氨基酸含量[J]. 兰州大学, 甘肃农业大学,2011,31(9):2454-24e0.
APA	张海娜,方向文,蒋志荣,&冯彦皓.(2011).柠条平茬处理后不同组织游离氨基酸含量.生态学报,31(9),2454-24e0.
MLA	张海娜,et al."柠条平茬处理后不同组织游离氨基酸含量".生态学报 31.9(2011):2454-24e0.