摘要
本研究以一年生墨西哥羽毛草(Nassella tenuissima)为试验材料,采用盆栽控水法对墨西哥羽毛草进行水分胁迫,测定其各项指标,以期为墨西哥羽毛草的养护管理与在园林中的合理应用提供理论基础。结果表明,土壤水分为田间最大持水量的20%、40%、60%处理(D20、D40、D60)的植株株高生长速度和叶片相对含水量随干旱胁迫时间的延长而大幅度地降低,复水后D_(20)、D_(40)、D_(60)各处理的叶片含水量与对照(土壤水分为田间最大持水量的80%)相差7.11%、2.68%、0.80%,只有D_(20)处理与对照差异显著(P<0.05)未恢复到对照水平;相对电导率和丙二醛(MDA)含量随各处理水分胁迫时间的延长而呈逐步增加的趋势,复水后,D_(20)、D_(40)、D_(60)各处理相对电导率分别比对照高12.1%、5.92%、2.42%,D_(20)、D_(40)、D_(60)处理MDA含量分别为对照的152.18%、151.92%、133.97%,与对照差异显著(P<0.05);在水分胁迫下的超氧化物歧化酶(SOD)和过氧化酶(POD)活性均呈先上升后下降的变化趋势,复水后,D_(20)、D_(40)、D_(60)各处理SOD活性恢复到对照的82.65%、90.68%、97.13%,只有D_(20)处理与对照差异显著(P<0.05),其余处理均恢复到对照水平,D_(20)、D_(40)、D_(60)处理POD活性与对照相差7.54%、5.55%、11.73%,D_(20)、D_(40)处理与对照差异显著(P<0.05)。通过本研究可以得出,墨西哥羽毛草具有较强的抗旱性,能够适应40%田间持水量的土壤水分条件,是干旱地区优良的园林地被植物。
We measured some of the physiological markers of the annual grass species Nassella tenuissima during a period of water stress imposed by potted water control to provide a theoretical basis for conservation management and rational use of this grass in the garden. Results showed that growth rate,in terms of plant height,and leaf relative water content of plants treated with 20%,40% and 60%( D_(20),D_(40),and D_(60)treatments) of soil maximum water-holding capacity decreased significantly with duration of the drought stress. After rewatering,the difference in leaf relative water content between D_(20),D_(40) and D_(60) treatments,relative to the controls( 80% of soil maximum water-holding capacity) was 7. 11%,2. 68% and 0. 80%,respectively. Plants under treatment20 did not return to the control level,and the difference between the two was highly significant( P < 0. 01). Relative electric conductivity and malondialdehyde( MDA) content increased gradually with increasing duration of water stress. After rewatering,relative electric conductivity of each treatment increased by 12. 1%,5. 92%,and 2. 42% over the mean control value,respectively. MDA contents were 152.18%,151. 92%,and 133. 97% relative to the control,respectively,and the difference was highly significant( P < 0.01). Under water stress,superoxide dimutase( SOD) and peroxidase( POD) activities increased first and then decreased. After rewatering,SOD activity of D_(20),D_(40),and D_(60) treatments returned to 82. 65%,90. 68% and 97. 13% of the control level,respectively. Again,plants under treatment D_(20) were significantly different( P < 0. 05) with respect to the control,while the rest of the treatments returned to control level. POD activity in D_(20),D_(40),and D_(60) plants was 7.54%,5. 55% and 11. 73%,respectively,compared with control. D_(20) and A40 treatments were significantly different( P < 0. 05) from controls. Based on these observations,we conclude that N. tenuissima is characterized by a remarkable drought resistance; it can adapt to 40% of soil
出处
《草业科学》
CAS
CSCD
2018年第3期581-589,共9页
Pratacultural Science
基金
河北省科技支撑项目(16236802D)
关键词
墨西哥羽毛草
水分胁迫
株高
相对含水量
膜透性
保护酶系统
Nassella tenuissima
water stress
plant height
relative water content
membrane permeability
protective enzyme system
