论文部分内容阅读
以沟叶结缕草(Zoysia matrella)为试材,研究了践踏胁迫下抗氧化酶活性、渗透调节物质含量和光合参数的变化,以期从生理学角度认识沟叶结缕草耐践踏特性。结果表明:践踏胁迫使沟叶结缕草光合速率(Pn)、蒸腾速率(Tr)、胞间CO2浓度(Ci)呈降低趋势,在中度和重度践踏下,沟叶结缕草气孔导度(Gs)比对照显著增加(P<0.05)。践踏胁迫对沟叶结缕草叶片抗氧化酶活性的影响不尽相同。践踏胁迫下,沟叶结缕草叶片超氧化物歧化酶(SOD)活性呈先下降后升高趋势,而过氧化物酶(POD)活性和过氧化氢酶(CAT)活性呈先升高后降低趋势。沟叶结缕草可以通过增加体内游离脯氨酸和可溶性糖的含量,有效改变细胞的渗透势,从而改变自身的渗透调节能力以抵抗践踏导致的渗透胁迫。
Zoysia matrella was used as test material to study the changes of antioxidant enzyme activities, osmotic adjustment substances and photosynthetic parameters under trampling stress in order to understand the trampling resistance of Zoysia matrella from a physiological point of view. The results showed that transpiration decreased the photosynthetic rate (Pn), transpiration rate (Tr) and intercellular CO2 concentration (Ci) of Zoysiagrass podophyllum. Under moderate and severe trampling, stomatal conductance (Gs) increased significantly compared with the control (P <0.05). The effects of trampling on the antioxidant enzyme activities of Z. crassifolia leaves varied. Under trampling stress, the activity of superoxide dismutase (SOD) in Zoysia tenuifolia leaves first decreased and then increased, while the activity of peroxidase (POD) and catalase (CAT) increased first and then increased Reduce the trend. Zoysia matrella can change the osmotic potential of cells by increasing free proline and soluble sugar in the body, thereby changing its osmotic adjustment ability to resist the invasion-induced osmotic stress.