The results in this study indicated that the appropriate treatment of PGR-S-Y (T2) increased the SPAD
significantly, the ultilization rate of CO2 and the Photosynthetic rate, and alleviated the midday
depression. It had no effect on the vegetative growth stage, and it significantly increased the yield and the
stevioside content for 11.09% and 4.74% respectively than CK. But when the PGR-S-Y content was too
high(T3), it decreased the ultilization rate of CO2,the Photosynthetic rate, and photosynthate.At the same
time, the vegetative growth stage shortened seriously, also the yield and the stevioside content decreased
significantly. So this study could provided the technical guidance for the cultivation of Stivia rebaudiana
Bertoni..
The results in this study indicated that the appropriate treatment of PGR-S-Y (T2) increased the SPAD significantly, the ultilization rate of CO2 and the Photosynthetic rate, and alleviated the midday depression. It had no effect on the vegetative growth stage, and it significantly increased the yield and the stevioside content for 11.09% and 4.74% respectively than CK. But when the PGR-S-Y content was too high(T3), it decreased the ultilization rate of CO2,the Photosynthetic rate, and photosynthate.At the same time, the vegetative growth stage shortened seriously, also the yield and the stevioside content decreased significantly. So this study could provided the technical guidance for the cultivation of Stivia rebaudiana Bertoni..
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