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ABA,a growth-resisting hormone.However,the average cross sectional area of trees at breast height in the ancient trees group has been increasing with aging which shows the continuous cambial cells division. Little difference was found when it comes to their ability to photosynthesize(光合作用)，grow leaves,grow seeds or resist disease compared to younger r trees,showing that the ancient trees group are actually in a healthy and mature state. Lin Jinxing of Beijing Forestry University and an author the study said that trees usually die from outside stress like pests.They found disease-resistance associated genes kept high expression in old trees,along with the synthesis (of pro- tective compounds,showing that the old trees do not lose their a- bility to defend against outside stressors.The researchers con- cluded that the longevity of ginkgo trees is a balance between the