Effects of low-light stress on maize ear development and endogenous hormones content of two maize hybrids (Zea mays L.) with different shade-tolerance Study on the Photosynthetic Characteristics of Shade-tolerant Ground Cover Plant Liriope spicata Lour. Influences of Wavelength and Intensity on Carotenoid of Four Lawn Grass Morphological plasticity of shade tolerance of three conifers in Changbai Mountain and regulation of hormone Comparative Studies on Light Utilization Characteristics and Shade Tolerance of 7 Climbing Shrub Species Analysis of shade-tolerance and determination of evaluation indicators of shade- tolerance in seedlings of Chrysanthemum grandiflorum and its closely related genera