STUDIES ON THE EFFECT OF RARE-EARTH ON NURSERY STOCK GROWTH IN PAULOWNIA SPP. Progress in the Death Mechanism Research of Paulownia spp. Terminal Buds A STUDY ON MICROSPORE ABORTION AND THE RELATION TO ABNORMAL WALL LAYERS IN PAULOWNIA SP. ON CONTROLLING BAMBOO LOCUSTS BY RED-HEADED BEETLES RESPONSES 0F RESISTANT AND SUSCEPTIBLE CLONES 0F IN VITR0 CULTURED PAUL0WNIA TO THE GRAFT INOCULATION WITH PHYTOPLAS MAS Effects of Photoperiods on in vitro Plantlet Regeneration of Paulownia Plants Leaves