Screening Of Strawberry Varieties In Different Facilities And Study On Salt Tolerance And Disease Resistance

In this test,strawberry varieties mainly grown in Tianjin were used as test materials.By measuring the fruit quality and nutritional quality indicators of various varieties,cluster analysis was used to comprehensively evaluate and analyze each strawberry’s quality indicators,and salt the high-quality varieties.Stress tests and field observations of disease resistance provide technical support for strawberry production and future strawberry breeding in Tianjin and other regions.The test results are as follows:（1）Quality evaluation:Sweet C harlie’s fruit has the highest hardness;Akihime’s average single fruit weight is the best;Allstar fruit color is brighter;Suizhu plant has higher soluble protein content;White strawberry Hatsukoi has the highest vitamin C content;Ssanta is the highest in soluble solids and soluble sugar;All-stars have the highest titratable acid;Sweet Charlie has the highest total p Henols,flavonoids and anthocyanins;Benihoppe has the highest anthocyanin content.Based on the results of cluster analysis,the classification was based on the correlation of multiple quality traits,and the ten varieties were clustered into four categories.Among them,the first type of p Henols is higher,including Benihoppe,Sweet C harlie and Toyonoka;the second type of fruit has better taste and single fruit weight,including Suizhu strain,Ssanta,Sagahonoka,Xuemei and Akihime;the third type Can be used as processed varieties,including Allstars;the fourth category contains higher levels of antioxidants,including Hatsukoi.（2）Salt resistance analysis:Salt stress can reduce the growth of plant crown diameter,petiole length,and leaf area,and reduce the nutrient content in the shoots and roots.During stress,the content of osmotic regulators,soluble sugars and soluble proteins in leaves showed fluctuating changes after increasing,and the root-shoot ratio and root vigor of plants showed fluctuating changes at low concentrations,and decreased significantly when they exceeded critical concentrations.With the increase of salt concentration during the stress process,the leaf color index decreased,which would affect the strength of photosynthetic capacity of strawberry plants.As a result,the degree of stomata opening decreases,the intracellular CO₂ content increases,the net photosynthetic rate and transpiration rate decrease,and the significant decrease at high concentrations.p Hotosynthesis caused changes in the fluorescence emission in the leaves,and F₀ increased with the increase of salt treatment concentration.The increase of each variety increased after 7 to 14 days of low concentration treatment,and the increase increased significantly after 7 days of high concentration treatment.F_v/F₀increased first and then decreased under salt treatment.Each species began to decrease after 14 to 21 days at low concentration,and a significant decrease occurred after 7 days at high concentration.F_v/F_mbegan to decrease after 7 days of stress,and the efficiency value decreased with the increase of treatment time,and the decrease range increased with the increase of concentration.The photosynthetic performance index increased first and then decreased.According to a comprehensive analysis of multiple indicators,it can be seen that 0.3%Na C l treatment is a critical concentration that affects plant growth.Inhibiting plant growth at low concentrations can maintain normal life activities through self-regulation,and inhibit normal growth at concentrations above 0.3%.（3）Disease resistance survey:five varieties of Akihime,Akihime,Benihoppe,Hatsukoi and Ssanta were selected for field observation experiments,and plant growth and soil EC and p H values were sampled to investigate the effects of soil differences on plant growth.In addition,there was no influence of extreme weather on the test during the test.Analysis of the resistance to powdery mildew:Akihime