The Research In The Cold Resistance Of Five Evergreen Lianas

This research applied the common methods of seven physiologies index fortesting resistance. Through the protoplasmic membrane penetrability, the MDAcontent, it tests the injury degree of the protoplasmic membrane in the adversecircumstance threats. Further studies had been proceeded to explore the protectingenzyme system like SOD and POD. Seeing that the SOD is the essential enzymefor the anti—active oxygen injury, a fairly thorough test had been implementedin this issue, a very stable result which could be duplicated had been obtained,moreover, the research proofs that the SOD activity in liana's leaves had beenenhanced, whose cold resistance was strong under the low temperature, whereasthe MDA content in them is relatively lower, their relation assume obviouslynegative relevance. This may explain the SOD is the anti—active oxygen theprotection enzyme, and realy play a important role in protective function. To thematter of seepage adjustment, the experiment has determined the content of thesoluble protein and the soluble sugar. Under the low temperature forces, thesoluble protein and soluble sugar content had been increased remarkably in theleases from the lianas whose durable ability for low temperature were relativelystrong. Moreover, with the high chlorophyll content, the photosynthesis gosestronger, therefore, the regularity of the chlorophyll content change may showthe rule of the plant photosynthesis change under low temperature threat in thecertain degree, and indicated the plant's sensitivity to low temperature forces.The research confirmed the six indexes could be as resistance criteria of the fivekinds of ever green lianas, they are protoplasmic membrane relativepenetrability, SOD activeness and POD activeness, soluble protein content andsoluble sugar content, the MDA content. However the chlorophyll content couldbe as the norm for reference. The results show hat the sequence of coldtemperature from strong to weak is Euonymus fortunei＞Vinca major＞Hedera nepalensis var.sinensis＞Mucuna sempervirens＞Millettia reticulata...