空间飞行对五角枫植株生理指标及抗氧化酶的影响

EFFECT OF SPACE FLIGHT ON PHYSIOLOGICAL INDEXES AND ANTIOXIDANT ENZYMES OF Acer mono

为探讨空间飞行对五角枫植株生理指标及抗氧化酶的影响,以"实践8号"育种卫星搭载种子培育所得5年生植株为研究对象,以未搭载种子的同龄实生植株为对照,对生长性状、光合生理指标、抗氧化酶及可溶性蛋白质含量进行了测定和分析。结果表明:(1)空间飞行显著提高了五角枫植株生长量、净光合速率、叶绿素含量、超氧化物歧化酶(SOD)活性及可溶性蛋白含量。而对丙二醛(MDA)含量、过氧化物酶(POD)活性、蒸腾速率、胞间CO2浓度及气孔导度等影响未达显著水平。(2)空间飞行提高了五角枫植株的净光合速率和植株生长量,而高净光合速率可能是导致搭载后五角枫植株具有高生长量的原因之一。

To investigate the effects of space flight on physiological indexes and antioxidant enzymes of Acer mono, seeds were divided into two groups, one was treated by carrying on Shijian No. 8 breeding satellite for 15d, and the other was kept on the ground as controls. 5 years old seedlings that derived from the seeds of space flight and the seeds of ground control were chosen as materials, then the growth characteristics, photosynthetic characteristics, soluble protein content and antioxidant enzymes activities were analyzed. The results showed that the plant growth, net photosynthetic rate （Pn） , chlorophyll content, superoxide dismutase （SOD） activity and soluble protein content of seedlings after space flight were much higher than those of ground control. However, the changes of malondialdehyde （MDA） content,peroxidase （POD）,transpiration rate （Tr）,intercellular carbon dioxide concentration （Ci） and stomatal conductance （Gs） were not significantly changed. The net photosynthetic rate （Pn）, as well as the plant growth of seedlings after space flight were higher than those of the control. The improved ability of photosynthesis may be one of the reasons that seedlings from seeds of space flight have higher speed of growth.