Mo和Mn对七子花几种生理效应的影响

The Effects of Mo and Mn on Some Physiological Characteristics of Soybean

研究了Mo、Mn对七子花 5种生理生化指标 (叶绿素含量、净光合速率、暗呼吸速率、可溶性糖含量和硝酸还原酶活性 )的影响 ,结果表明 ,两者对七子花的上述性状都产生了较大的影响。当七子花处于缺Mo缺Mn状态 ,上述各项生理指标都处在最低水平 ,随着Mo或Mn质量浓度的升高 ,各指标都呈现上升趋势 ,当Mo的质量浓度为 0 .5mg·L- 1或Mn的质量浓度为 0 .0 5mg·L- 1时 ,七子花的叶绿素含量 (分别为 2 .0 2 ,1.36mg·g- 1)、净光合速率 (分别为 1.79,0 .90 1mg(CO2 )·dm- 2 ·h- 1)、暗呼吸速率(分别为 2 .2 5 ,2 .95 μmol(CO2 )·m- 2 ·s- 1)都达到最高水平 ;Mo或Mn的质量浓度为 5mg·L- 1时 ,七子花叶片的可溶性糖含量 (分别为 5 .4 5 ,4 .2 6g·kg- 1)最高 ;当Mo的质量浓度为 5mg·L- 1或Mn的质量浓度为 0 .0 5mg·L- 1时 ,硝酸还原酶活性 (分别为 2 79.31,4 6 5 .2 4 μmol(NO- 2 )·g- 1·h- 1)最高 ,高于上述各最高值的质量浓度时 ,七子花上述生理指标都呈下降的趋势。七子花对高Mo的忍耐力大于对高Mn的忍耐力。Mo和Mn的关系较为复杂 ,本试验检测的七子花多数生理指标显示 ,当Mo和Mn在较低质量浓度时 (ρ <0 .0 5mg·L- 1) ,Mo和Mn在七子花体内呈现相互促进作用 ,当Mo和Mn在较高质量浓度时 (ρ≥ 0

The effects of manganese and/or molybdenum on five indexes of physiology and biochemistry (contents of chlorophyll, net photosynthesis, dark respiration, activity of nitrate reductase and contents of soluble sugars) of Heptacodium miconioides leaves were studied. The results showed that manganese and/or molybdenum have great influence on them. Five indexes are the lowest under the deficiency of manganese and molybdenum and increase along with increase of densities of manganese or molybdenum. When the density of manganese is 0.05 mg·L -1 or molybdenum is 0.5 mg·L -1 , contents of chlorophyll, net photosynthesis and dark respiration of Heptacodium miconioides leaves are the greatest respectively in the treatment of manganese or molybdenum. When the density of manganese or molybdenum is 5 mg·L -1 , content of soluble sugars of Heptacodium miconioides leaves is the greatest respectively in the treatment of manganese or molybdenum. When the density of manganese is 0.05 mg·L -1 or molybdenum is 5 mg·L -1 , the activity of nitrate reductase of Heptacodium miconioides leaves is the greatest respectively in the treatment of manganese or molybdenum. If the density of manganese or molybdenum is higher than the best suitable one (each index is the greatest in that), each index begins to descend. The patience of Heptacodium miconioides with high molybdenum is greater than that with high manganese. The interrelation between molybdenum and manganese is complicated. When molybdenum and manganese are low (<0.5 mg·L -1 ), they are cooperative each other and when they are high(>0.5 mg·L -1 ), they are incoordinate each other.