The leaf area index (LAI), chlorophyll a (Chla), chlorophyll b (Chlb), and total chlorophyll (Chl (a+b)) all showed an upward trend with the advancement of the growth process before flowering. Chlorophyll a/chlorophyll b (Chla /Chlb) presents a trend of first decline and then rise. The net photosynthetic rate (Pn), stomatal conductance (Gs), and transpiration rate (Tr) show a trend of rising first and then falling during the entire growth process, reaching the maximum during the flowering period. The intercellular CO2 concentration (Ci) showed a trend of decreasing first and then increasing, the value of the flowering period dropped to the lowest, and then gradually increased.
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