Effects of High Temperature Stress on Physiological Characteristics and Yield of Potato Leaves
Potato is an important food crop and is very sensitive to high temperature.In order to study the effects of high temperature stress on the physiological characteristics and yield of potato leaves,'Qingshu 9'was used as the experimental material,and the leaf area,chlorophyll content,photosynthetic fluorescence characteristics and yield of potato were systematically studied using randomized block design.The results showed that the leaf area index and leaf SPAD value decreased significantly under high temperature stress.The leaf area indexes of T1 treatment were decreased by 11％-34％compared with T2 treatment,and they were decreased by 34％-68％compared with T3 treatment.The SPAD value of T2 treatment was decreased by 2.43％compared with T3 treatment.Secondly,the photosynthetic fluorescence and yield also decreased,and the recovery was relatively slow,which inhibited the production of Pn and the absorption and transformation of light energy.The reactive oxygen species increased,and the leaves were dehydrated and wilted to cause death,which would affect the whole growth process of potato,resulting in the final reduction of yield.Therefore,high temperature will lead to the change of functional leaves,which will reduce the photosynthetic performance of potato,gradually shorten the active period,disorder the physiological metabolic activity,and significantly reduce the yield.
potatohigh temperature stressphotosynthetic characteristicsfluorescence characteristicsyield
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