Abstract:

By means of the stress of different low temperatures for the pearl Guava and seedless Guava, both introduced from Taiwan, and the native Guava in Fujian province, several physio-biochemical changes of their leaves have been determined under the low-temperature stress to seek the cold resistance and bearable critical low temperature of different Guava varieties. The results showed that the bearable low temperature of Guava was -3～-4℃, the cold resistance of different varieties was different and the difference was related with the bound water/free water ratio of leaves,the content of soluble protein, and the content of soluble sugar. The cold resistance of the native Guava was higher than that of two Guava varieties introduced from Taiwan.

Key words: Guava, Low-temperature stress, Physiology and biochemistry, Critical low temperature