Some Senescence Characteristices of the Leaf of Pinus taiwanensis

This paper was about the study on senescence of Pinus taiwanensis.The results showed:with the increase of age,(1)the contents of chlorophyll and protein,the radio of chlorophyll a/chlorophyll b declined;(2)the activity of SOD and CAT decreased and decrease of the activity of CAT was more significant;(3)the content of MDA rose.It is concluded that the content of chlorophyll and protein,the radio of chl.a/chl.b could be regarded as the index of senescence of P. Taiwanensis. There was a direct interrelation between leaf senescence and free radical.