Effects of β-aminobutyric Acid on Physiological Characteristics of Chrysanthemum Under Cd Stress Primary Analysis of the Function of Nodulin MtN21 Gene At1 g09380 in Arabidopsis thaliana EFFECT OF LONG?TERM APPLICATION OF MANURES ON FORMS OF Fe,Mn,Cu AND Zn IN PURPLE PADDY SOIL Effect of short-term salt stress on the absorption of K+ and accumulation of Na+,K+ in seedlings of different wheat varieties Analysis on the change of the original Metasequoia glyptostroboides population and its environment in Lichuan Hubei from 1948 to 2003 Effects of β-aminobutyric Acid on Physiological Characteristics of Chrysanthemum Under Cd Stress