Fig. 4

Biomass allocation in different grades of P. yunnanensis seedlings. RB represents root biomass; SB represents stem biomass; LB represents leaf biomass; AB represents above-ground biomass; NPB represents non-photosynthetic biomass. Note: Different lowercase letters indicate significant differences between grades within the same organ (p < 0.05), while different uppercase letters highlight significant variations between organs within the same grade (p < 0.05).