Study on Relationship between Hormone and Growth Vigor of Young Juglans regia Differential transcriptome analysis between Populus and its synthesized allotriploids driven by second-division restitution Comparative Analysis of Photosynthetic Characteristics of Populus deltoides Clones with Different Growth Vigor Comparison of Photosynthetic Characteristics of Populus deltoides and Their F1 Hybrid Clones STUDY AND INVESTIGATION ON COMMON CRAPEMYRTLE IN THE WUHAN AREA Studies on the Rela tionship between the POD and IOD Activity and the Growth Vigor of Walnut Differences in Growth and Physiological Characteristics in Different Growth Vigor Clones of Populus deltoides Studies on the Rela tionship between the POD and IOD Activity and the Growth Vigor of Walnut