THE EFFECT OF COLD RESISTANT AND HOMOBRASSINOLIDE ON THE CHILLING RESISTANCE OF PLATEAU RICE A PRELIMINARY STUDY ON COLD RESISTANT PHYSIOLOGY OF RUTA GRAVEOLENS Hydrogen Peroxide Metabolism and Signal Transduction under Cold Stressin Plants Hydrogen Peroxide Metabolism and Signal Transduction under Cold Stressin Plants PHYSIOLOGICAL ADAPTABILITY OF DONGNONGDONGMAI 1 TO LOW TEMPERATURE STRESS OF HIGH-COLD AREA Reproductive Ecology of Armeniaca sibirica with Cold Resistant in Inner Mongolia Key temperatures of corn and sunflower during cooling process in Hetao irrigation district, Inner Mongolia