摘要
用 5 0 ,1 0 0 ,2 0 0 ,30 0mmol/L含有不同比例NaCl,Na2 SO4,NaHCO3和Na2 CO3的混合盐溶液对高粱 (SorghumbicolorL .)幼苗进行混合盐碱胁迫处理。测定高粱幼苗存活率、相对生长率、相对含水量、相对根系活力以及电解质外渗率等胁变指标。结果表明 :上述各项胁变反应均随盐浓度和碱性盐比例增加而加剧。由碱性盐造成的高 pH所致的胁变效应与盐浓度之间相关 :即低盐度时 pH作用较小 ,随盐度增大其作用加剧。在碱胁迫较弱时胁变主要受盐度影响 ,随碱胁迫增大pH成为影响胁变的主要因素。在高盐高碱条件下 。
Seedlings of Sorghum bicolor L. were subjected to stress with 28 kinds of 50,100,200,300 mmol/L of salt mixture which were composed of NaCl,Na 2SO 4,NaHCO 3 and Na 2CO 3. Under these conditions, the physiological indices such as survival rate, relative growth rate, relative root vitality, relative water content and lekage rate of electrolyte were determined . The results showed that these responded stains were aggravated with the increasing salt concentration and proportion of the basic salts. The strain reaction from high pH was closely related to salinity. The high pH reaction weaker when the salinity was lower and became progressively stronger intensely with the increasing salinity . When the alkaline stress was weak, the strain effect was mainly associated with the total salt concentration,but the pH capacity became the dominant factor effecting strain with the increasing alkaline stress. There was the combined effect between salt stress and alkaline stress when the stress condition is not only high pH value but also high concentration of salt.
出处
《杂粮作物》
CAS
2002年第1期41-45,共5页
Rain Fed Crops
