硅对干旱胁迫下草坪草叶片保护酶系统及丙二醛含量的影响

Effects of silicon on protective enzyme system and MDA content of turfgrass leaves under drought stress

研究干旱胁迫下不同浓度硅肥对3个草坪草品种狗牙根(Gynodon dactylon)品种百慕大(Bermudgrass)、草地早熟禾(Poa pratensis)的优美(Euromyth)和高羊茅(Festuca arundinacea)猎狗5号(Houndog 5)的叶片保护酶活性及膜质过氧化产物含量的影响。按田间最大持水量的100%(FWC100),75%(FWC 75)和50%(FWC 50)进行灌水处理,同时对不同灌水处理下3个草种均进行不施硅肥,施28,56,112 mg/L硅肥。结果显示:随着灌水量的减少,3个草坪草品种的超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性明显下降,丙二醛(MDA)含量明显升高;施硅肥后,随着硅肥浓度的增加,FWC100灌水条件下3个草种的SOD,CAT活性及MDA含量并没有发生明显变化;在FWC75和FWC50灌水条件下3个草种的SOD,CAT活性出现了明显上升,MDA含量出现了明显下降。尤其FWC50灌水处理下SOD,CAT活性及MDA含量变化更为明显。比较不同浓度硅肥产生的效应,56 mg/L硅肥处理下3个草种的SOD,CAT活性及MDA含量变化更明显。

The study was conducted to investigate the effect of water and different concentration silicon fertilizer on protective enzyme system and MDA content of turfgrass leaves. Three kinds of turfgrasses, Bermudgrass,Euromyth and Houndog 5, were irrigated by 100%, 75 %, 50 % of field moisture capacity, and then three turfgrasses were fertilized using 0,28 × 10^-6 , 56 × 10^-6 , 112 N 10.8 silicon acid respectively. The results indicated that SOD,CAT activities of three turfgrasses markedly declined, MDA content markedly increased with drought stress sharpper. With silicon concentration increasing,there were no signifcant changes in SOD,CAT activities, and MDA content of three turfgrasses under FWC100 treatment. However,SOD,CAT activities of three turfgrassed markedly increased and MDA content declined under FWC75 and FWC50 treatments, in particular,under FWC 50 treatment,changes of SOD,CAT activities and MDA content were more distinct. Compared with different concentration silicon fertilizer effects, 56 X 10.6 silicon fertilizer had significant effects on improving enzyme activity and decreasing MDA content of three turfgrasses. The changes in protective enzyme activities and MDA content had different due to different drought resistance of three turfgrass species.