Effect of Strong Light on Net Photosynthetic Rate between Two Rice Subspecies du ring Leaf Aging Epistatic and QTL × Environment Interaction Effects of QTLs for Leaf Traits and Leaf Chlorophyll Content in Soybean VARIATIONS IN LEAF FUNCTIONAL TRAITS OF SIX SPECIES ALONG A NITROGEN ADDITION GRADIENT IN LEYMUS CHINENSIS STEPPE IN INNER MONGOLIA