Fig.1

Diagram of experimental process"

Table 1

Effects of three exogenous MeJA on growth increment of T. ciliata seedlings"

Fig.2

Effects of exogenous MeJA on osmotic regulatory substances of T. ciliata leaves E：Morphological changes of mesophyll cells．×：Average；◆：Outliers；the top and bottom edges of the box represent the upper quartile and the lower quartile，respectively, the lines inside the box represent the median，and the lines outside the box represent the maximum and minimum values，respectively．The following picture is the same．"

Fig.3

Effects of exogenous MeJA on ASA-GSH cycle antioxidant enzymes in T. ciliata leaves"

Fig.4

Effects of exogenous MeJA on the content and ratio of non-enzymatic antioxidants in leaves of T. ciliata ×：Average；◆：Outliers；the top and bottom edges of the box represent the upper quartile and the lower quartile，respectively, the lines inside the box represent the median，and the lines outside the box represent the maximum and minimum values，respectively．The following picture is the same．"

Fig.5

Effects of exogenous MeJA on active oxygen accumulation and MDA content in T. ciliata leaves ×：Average；◆：Outliers；the top and bottom edges of the box represent the upper quartile and the lower quartile，respectively, the lines inside the box represent the median，and the lines outside the box represent the maximum and minimum values，respectively．The following picture is the same．"

Fig.6

Effects of exogenous MeJA on water and gas exchange parameters of T. ciliata leaves G：Leaf stomatal opening changes．×：Average；◆：Outliers；the top and bottom edges of the box represent the upper quartile and the lower quartile，respectively; the lines inside the box represent the median，and the lines outside the box represent the maximum and minimum values，respectively．The following picture is the same．"

Fig.7

Effects of exogenous MeJA on chlorophyll fluorescence parameters of T. ciliata leaves"

Table 2

Effects of exogenous MeJA on chlorophyll content of T. ciliata leaves"

Fig.8

Effects of exogenous MeJA on net photosynthetic rate and leaves color of T. ciliata B：Leaf color changes．×：Average；◆：Outliers；the top and bottom edges of the box represent the upper quartile and the lower quartile，respectivel, the lines inside the box represent the median，and the lines outside the box represent the maximum and minimum values，respectively．The following picture is the same．"

Fig.9

VIP value of each index obtained by PLS model $ {R}_{X}^{2} $： goodness of fit of the model to X； $ {R}_{Y}^{2} $： goodness of fit of the model to Y；Q2：prediction accuracy；R2 and Q2 should be greater than 0.4."

Fig.10

Correlation heat map of indicators with VIP value greater than 1"