the flowers get older and  the physiological change of pick post-processing

(The original text 14,000 characters, here abridge)

　　 The ageing process is a link in plant growth cycle, if can fully understand the reason of the flowers get older,will be helpful the pick post-processing technical progress. For example cut flowers on using chemical agent etc method to delays the flowers aging time,Or causes some section of ageing process to destruction or is sluggish,Takes advantage of this by lengthens cutflowers vase-life.　
                                                         Ethylene and senile phenomenon
　　The orchid is specially sensitive to the ethylene.In 1949,Scholar Davidson first proposed ethylene injury to the orchid,As well as all reasons and symptom.He discovers by the extremely low density (0.002 mu l/Liter) the ethylene processes continuously for 24 hours,Perhaps uses 0.1μl/l density ethylene processes for 8 hours,Can cause the jiadeli orchid sepal which soon blossoms to have the harm,The sepal can withered start and to start to bleach gradually,And extends by the peak spot toward the base.But this kind of calyx withered phenomenon usually in the florescence achieved mature when can appear naturally.This kind of ethylene causes the calyx withered phenomenon,In some ventilates not good production environment to be all easy to discover.　

　　　　　　　　　　　　　　　　　　Cut flowers pick post-processing
　　 The flowers cuts after the adult plant, many physiological reaction can receive the influence.Contains the moisture content transportation condition, respiration and ethylene production.Among moisturewet content influence is the key of cut flowers vase-life.The disadvantageous moisture content absorption is the principal factor which causes to cut flowers withers,But floral axis's moisture transportation blocks is as a result of the aeroembolism, the microorganism multiplies or the physiology blocks causes.
　　　 An  primary factor to influence orchid cut flowers quality,Then is the influence of ethylene production.Because of orchid regarding ethylene unusual sensitivity,Moreover can start autocatalysis production ethylene in the time which the senile phenomenon occurs,Therefore in the market has many chemical agents is ues by destroys perhaps suppression ethylene production way activeness.Also have the employment technology is direct detachment the ethylene which already produces.But related ethylene question, At present to make human unusual headache.

                                                               Pretreatment(preharvest)
　　In the processIn of cuts flowers pick post-processing,Neglects the pretreatment importance frequently.But this processing usually is important key to decides quality.In very many flowers,After picks loses proportion usually is 30-70%,biggest key is the ethylene pollution influence.

                                                                    Lengthens vase life　　　
　　The pulsing is the processing fluid use before cut flowers transportation.For example temperate zone flowers before transportation will according to recovers maturity,Soaks 2-20% sucrose fluid by to reduce the injury in transportation.If soaks WenXin Orchid Goldiana bouquet in the silver nitrate (silver nitrate) 30 minutes,May effectively lengthen its goods life. If aranda series bouquet of flowers,Soaks in the density is 4mM silver thiosulphate 10 minutes,May lengthen the vase-life.But in processing  pompadour orchid time,Soaks the silver nitrate (25ppm) perhaps the sodium thiosulphate, (135ppm) 30 minutes.May effectively lengthen the flowering season to 36 day from 23 days.
     Silver ThioSulphate; STS compound may effectively lengthen Aranda and dendrobium these two series flowering season,But this similarly also may use in the other temperate zone flowers which has the economic value.But its most main effect is suppresses the ethylene production after processing.Uses the STS most major characteristic is the need density is very low,as well as must the process time to be extremely short,Therefore applies on the plant has value extremely.Moreover must pay attention to the silver ion which the medicament contains,Had the memoir to point out may take the ethylene resistance medicinal agent.The silver ion can occupy the ethylene acceptor position,to prevents the plant ethylene autocatalysis occurrence. But in fact STS cannot affect the flowers like Aranda series after contact ethylene in the fresh weight, the dry matter is heavy and the moisture content displays the senile change degree.
     Recently has invented one kind of volatile ethylene inhibitor,Its name is called 1-MCP(1-Methyl-cyclo-propene),May effectively lengthen the fresh flower vase-life.The 1-MCP function effect and STS are extremely similar,Has very many merits,it produces the gas is does not have toxically.This kind of ethylene inhibitor use is broader,Also may apply above the potted flower.Future the environmental protection question will receive takes,Has intense pollution nature STS to be able to substitute by 1-MCP gradually.