Comparison of Virus Occurrence and Biological Characters of Different Grades of Seed Potatoes of Variety'Zangnongshu 1'
The degradation of seed potatoes(Solanum tuberosum L.)is a crucial factor that hinders the develop-ment of the potato industry.The disease situation of different grades of seed potatoes in the field after sowing is often varied,impacting their biological characteristics and final economic outcomes.The purpose of this research is to analyze virus reinfection in different grades of seed potatoes(pre-elite,elite,qualified Ⅰ and qualified Ⅱ)of the variety'Zangnongshu 1'after planting in the field,and to compare the growth,tuber quality,and yield.Only potato virus S was detected in the corresponding plants of the pre-elite.However,potato leafroll virus and potato virus S were detected in plants of other grades.At the same time,the incidence and disease index of potato leafroll virus and potato virus S in the pre-elite group were very low,while the qualified Ⅱ group showed the opposite trend.During the process of plant growth and development,the chlorophyll content and photosynthetic rate of leaves at the budding stage were the highest.The chlorophyll content and photosynthetic rate decreased with the decrease in grades of seed potatoes,while the plant height showed minimal variation.Although the starch and dry matter contents in potato tubers of different grades showed little difference,the reducing sugar content decreased as the grades of seed potatoes decreased.The statistical results of yield and marketable tuber percentage indicated that the pre-elite group had the highest values,while the qualified Ⅱ group had the lowest.There was little difference between the elite and qualified Ⅰ groups.Considering the cost and economic benefit,the seed potatoes of elite and qualified Ⅰ should be considered in the production of'Zangnongshu 1'.
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