1Institute of Vegetables， Zhejiang Academy of Agricultural Sciences， Hangzhou 310021， Zhejiang， China； 2School
of Agriculture and Food Science， Zhejiang Agriculture and Forestry University， Lin’an 311300， Zhejiang， China
Abstract：Taking‘Xinxilan’（high continuous cropping-sensitive pea cultivar） as test material，this paper studies the effects of self-toxicity substance cinnamic acid on pea（Pisum sativum L. ）seedling growth and chlorophyll fluorescence parameters．The results showed that cinnamic acid could significantly inhibit the growth and development of pea seedlings．After cinnamic acid treatment，the plant height，stem diameter，fresh and dry weight of pea seedlings above ground reduced significantly．At the same time，the contents of chlorophyll and carotenoid in leaves also decreased obviously．After applying cinnamic acid，seedling’s chlorophyll fluorescence parameters such as Fv/Fm，ΦPSⅡ，qP and qN were all significantly lower than those of the contrust．These results indicated that cinnamic acid could injure pea seedling’s potential activity， reduce its photosynthetic efficiency and finally significantly inhibit its growth and development.
