Comprehensive Evaluation Of Tomato Seedlings Resistant To Lowland Temperature And Comparative Study Of Maturity Tomato Lowland Temperature Resistance Capability

In this experiment,12different varieties of tomato seedlings as test material, Focuses on the normal land temperature is controlled, under lowland temperature tomato seedlings and mature lowland temperature resistance capability analysis. Application of principal component analysis and subordinate function method are combined analysis of tomato seedlings physiological and biochemical and morphological indicators analyzed to comprehensive evaluation of different tomato varieties resistant seedlings lowland temperature capability, and the most resistant to the most intolerant lowland species and low-temperature resistant varieties mature geothermal capacity is relatively warm lowlands.. The results showed that:1.Lowland temperature under adversity, for12different varieties of tomato seedlings resistant to evaluate strengths and weaknesses of lowland temperature:’CM78’>’toward the research’>’CM966’>’Gold beautiful’>’win beauty’>’Vegetarianin4’>’Prosperous Powder’>’Gold crown a number’>’And with3’>’Gingko strong abundant’>’Pink tomato’>’Gold168’, Followed by comprehensive evaluation value:0.77、0.69、0.63、0.40、0.39、0.36、0.36、0.33、0.30、0.28、0.22、0.10.2. Under lowland temperature stress, the most mature plants lowland temperature resistant tomato varieties resistant seedlings CM78the lowland temperature capability significantly better than most intolerant lowland warm tomato seedling Gold168.3. Under lowland temperature stress, there is a synergy and antagonism between the physiological indices of tomato. Among them, the tomato leaves protective enzyme SOD, POD, CAT activity improved in varying degrees, radicals O2, H2O2content increased, the enhanced role of membrane lipid peroxidation; relative conductivity increases, an increase of MDA content, membrane lipid structure severely damaged; SSC, Pr, Pro content increased resistance helps tomatoes.4. The experiment showed that the resistance of tomato seedlings lowland temperature characteristics and performance of adult basic consistent, so seedling identification results lowland temperate-resistant tomato varieties can be used as indicators of low estimate of its adult stage.