Plants in natural environments are often exposed to different irradiance in different seasons, and leaf-level acclimation to light may be affected by those changes. To investigate this, photosynthetic characteristics of lilyturf (Liriope muscari), a shade-tolerant evergreen groundcover of forest origin native to East Asia, were compared in summer, autumn and winter in plants growing in two light environments: an open field with high irradiance (HI) and under a winter-deciduous forest canopy (LI). Light saturation point, light compensation point, photon-saturated photosynthetic rate and in situ net photosynthetic rate (P_N) were highest in HI, as was whole-plant biomass. Photon-saturated rates of net photosynthesis were higher in autumn and winter than in summer. Substantial declines in P_N, stomatal conductance (g_s) and intercellular CO₂ were observed in HI plants during midday in summer, but not in LI or in autumn and winter. Chlorophyll fluorescence indicated that HI plants were photoinhibited during midday in both summer and winter and consequently performed best in autumn. In contrast, LI plants were light-limited in summer and performed better when the canopy was leafless, especially in winter. Winter and autumn photosynthesis may make critical contributions to the carbon economy of lilyturf integrated over the year, facilitating its growth and survival in a wide range of light environments.

自然环境中的植物通常在不同的季节受到不同的辐照度，并且这些变化会影响叶片的光照水平适应性。为了对此进行研究，在夏季，秋季和冬季，在两种光照环境下生长的植物中比较了Lilyturf（Liriope muscari）的光合特性，该植物是东亚原生森林的耐荫性常绿地被植物，该植物在两种光照环境下生长：高照度的开阔田地（ HI）和冬季落叶林冠（LI）下。光饱和点，光补偿点，光子饱和光合速率和原位净光合速率（P _N）在HI中最高，而整株生物量也最高。秋季和冬季，净光合作用的光子饱和速率高于夏季。P _N，气孔导度（g _s）和细胞间CO ₂大量下降在夏季的中午时分在HI植物中观察到了这种现象，而在LI或秋季和冬季中没有观察到。叶绿素荧光表明，HI植物在夏季和冬季的午间都受到光抑制，因此在秋季表现最佳。相反，LI植物在夏季受光限制，当树冠无叶时表现更好，尤其是在冬季。冬季和秋季的光合作用可能对一年中整合的Lilyturf的碳经济做出重要贡献，从而促进Lilyturf在广泛的光照环境中的生长和生存。