Fluorescent Characteristics of Chlorophyll of Favorita,an Early Maturing Potato Variety

The content of SPAD and Chlorophyll fluorescence of Favorita,an early maturing potato variety,were determined by using SPAD-502 and Os5p Chlorophyll meter modulated fluorescence to provide theoretical basis for further study on photosynthesis of early maturing potato variety.The results showed that in the tuber expansion and maturity period,the SPAD of different treatment is significantly different.There were significant or very significant differences among different treatments in chlorophyll fluorescence parameters Fo,Fm,Yield and Fv/Fo.The significant level varied at different growth period.In the tuber expansion period,the Fv/Fm value was 0.80～0.85,which indicated that it was the period of maximal accumulation of dry matter.By comparing the Fv/Fm and Yield of Favorita,the single peak of yield change is concluded.The change trend of photochemical efficiency was consistent with the relative content of chlorophyll.