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To evaluate the relative importance of photosynthetic versus morphological adaptations of submersed macrophytes to low light intensity in lakes, rapid light curves (RLCs), morphological parameters, relative growth rate (RGR), clonal reproduction and abundance of two submersed macrophytes ( Potamogeton maackianus  and  Vallisneria natans ) were examined under 2.8%, 7.1%, 17.1% and 39.5% ambient light in a field and outdoor experimental study. The plants increased their initial slope of RLCs (α) and decreased their minimum saturating irradiance (E k ) and maximum relative electron transport rate (ETRm) of RLCs under low light stress, but  V .  natans  was more sensitive in RLCs than  P .  maackianus . Accordingly, the RGR, plant height and abundance of  P .  maackianus  were higher in the high light regimes (shallow water) but lower in the low light regimes than those of  V .  natans . At the 2.8% ambient light,  V .  natans  produced ramets and thus fulfilled its population expansion, in contrast to  P .  maackianus . The results revealed that  P .  maackianus  as a canopy-former mainly elongated its shoot length towards the water surface to compensate for the low light conditions, however, it became limited in severe low light stress conditions.  V .  natans  as a rosette adapted to low light stress mainly through photosynthetic adjustments and superior to severely low light than shoot elongation.

Differential photosynthetic and morphological adaptations to low light affect depth distribution of two submersed macrophytes in lakes