科尔沁沙地少花蒺藜草不同生育时期生理适应性的研究

Studies on physiological adaptability of Cenchrus pauciflorus in different growth periods of Horqin sandy land

摘要:

为探究不同生育时期入侵植物少花蒺藜草(Cenchrus pauciflorus)在科尔沁沙地的生理适应特性,采用随机取样法在自然条件下采集各生育时期少花蒺藜草茎叶及根,测定生理指标。结果表明:各生育时期少花蒺藜草生理指标含量明显不同,与其他生育期相比,苗期植株的相对电导率(REC)、可溶性蛋白(SP)、脯氨酸(Pro)、过氧化物酶(POD)、过氧化氢酶(CAT)含量及酶活性都达到最大;分蘖期,植株的REC、SP、Pro、CAT及POD的含量和酶活性较苗期呈下降趋势,Pro含量最低,为0.039 mg/g,REC达到最大,为241.32 U/(g·h);开花期,植株的SP含量、POD活性最小,分别为3.57 mg/g、2 145 U/mg,SOD活性达到最大,为394.31 U/g;可溶性糖(SS)和丙二醛(MDA)含量在全生育时期变化不明显。

Abstract:

To explore the physiological adaptation characteristics of field sandbur (Cenchrus pauciflorus Benth),an invasive plant at different fertility stages,in Horqin sandy land,in this study,the stems,leaves and roots of field sandbur were collected under natural conditions by random sampling method,and the physiological indexes were measured.The results showed that the physiological indexes of field sandbur were different in each growth stage.Compared with other growth stages,the relative electrical conductivity (REC),soluble Protein (SP),Proline (Pro),peroxidase (POD),catalase (CAT),and enzyme activity of seedling plants reach the maximum;At the tillering stage,the content of REC,SP,Pro,CAT and POD and enzyme activity of the plant decreased,the content of Pro was the lowest (0.039 mg/g), and the REC reached the maximum (241.32 U/(g·h));at flowering stage,SP content and POD activity were the lowest,which were 3.57 mg/gFW and 2 145 U/mgFW respectively,and SOD activity was the highest,which was 394.31 U/gFW;the content of soluble sugar (SS) and malondialdehyde (MDA) did not change significantly in the whole growth period.To sum up,field sandbur initiated different physiological mechanisms to adapt to the external environment in different reproductive periods.