Leaf functional traits are adaptations that enable plants to live under different environmental conditions. This study aims to evaluate the differences in leaf functional traits between red and green leaves of two eve...Leaf functional traits are adaptations that enable plants to live under different environmental conditions. This study aims to evaluate the differences in leaf functional traits between red and green leaves of two evergreen shrubs Photinia × fraseri and Osrnanthus fragrans. Specific areas of red leaves are higher than that of green leaves in both species. Thus, the material investment per unit area and per lamina of red leaves is significantly lower than that of green leaves, implying an utmost effort of red leaves to increase light capture and use efficiency because of their low leafchlorophyll concentration. The higher petiole length of green leaves compared with that of red leaves indicates that adult green leaves may have large fractional biomass allocation to support the lamina structures in capturing light with maximum efficiency and obtaining a high growth rate. The high range of the phenotypic plasticity of leaf size, leaf thickness, single-leaf wet and dry weights, and leaf moisture of green leaves may be beneficial in achieving efficient control of water loss and nutrient deprivation. The high range of phenotypic plasticity of leaf chlorophyll concentration of red leaves may be advantageous in increasing resource （especially light） capture anduse efficiency because this leaf type is juvenile in the growth stage and has low leaf-chlorophyll concentration.展开更多
对红叶石楠“红罗宾”(Photinia fraseri“Red Rob in”)离体培养苗生根的主要影响因子进行了系统的研究和分析。发现在NAA,IBA,IAA和ABT生长素中,NAA对红叶石楠的生根作用效果最好,最佳浓度为0.3 mg/L;在MS,1/2MS,B5,W h ite和M木(木...对红叶石楠“红罗宾”(Photinia fraseri“Red Rob in”)离体培养苗生根的主要影响因子进行了系统的研究和分析。发现在NAA,IBA,IAA和ABT生长素中,NAA对红叶石楠的生根作用效果最好,最佳浓度为0.3 mg/L;在MS,1/2MS,B5,W h ite和M木(木本培养基)5种基本培养基中,M木对生根影响最大,为最佳生根基本培养基;同时发现,自然添加物E物质对红叶石楠生根有巨大的促进作用,在添加E物质后,红叶石楠根数量明显增多且粗壮、出根整齐而快,10 d内生根率达98.5%,比对照提高了30多个百分点,出苗时间提前了10多d。红叶石楠生根的最佳培养基为:M木+NAA 0.3 mg/L+E物质6.0 g/L。展开更多
基金financially supported by the National Natural Science Foundation of China(31300343)Natural Science Foundation of Jiangsu Province,China(BK20130500)Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment
文摘Leaf functional traits are adaptations that enable plants to live under different environmental conditions. This study aims to evaluate the differences in leaf functional traits between red and green leaves of two evergreen shrubs Photinia × fraseri and Osrnanthus fragrans. Specific areas of red leaves are higher than that of green leaves in both species. Thus, the material investment per unit area and per lamina of red leaves is significantly lower than that of green leaves, implying an utmost effort of red leaves to increase light capture and use efficiency because of their low leafchlorophyll concentration. The higher petiole length of green leaves compared with that of red leaves indicates that adult green leaves may have large fractional biomass allocation to support the lamina structures in capturing light with maximum efficiency and obtaining a high growth rate. The high range of the phenotypic plasticity of leaf size, leaf thickness, single-leaf wet and dry weights, and leaf moisture of green leaves may be beneficial in achieving efficient control of water loss and nutrient deprivation. The high range of phenotypic plasticity of leaf chlorophyll concentration of red leaves may be advantageous in increasing resource （especially light） capture anduse efficiency because this leaf type is juvenile in the growth stage and has low leaf-chlorophyll concentration.
