The Response Differences of Growth and Physiology Properties of Different Tomatoes Varieties to Enhanced UV-B Radiation

Eight cultivars of tomatoes from different habitat were chosen as experimental material.Pot experiments were conducted to simulate enhanced UV-B radiation under ozone declined 20% in the green house in order to study the different responses of growth and physiological properties of eight cultivars of tomatoes to enhanced UV-B radiation (5kJ/m2). The results showed that: (1) the plant height, root length and biomass of tomatoes decreased under enhanced UV-B radiation. The biomass of Lycopersicon esculentumTaiwanshengnv(TS) and L. esculentum var. cerasiforme (YT) decreased by 60.90% and 14.93%.(2) Under enhanced UV-B radiation, the contents of pigments decreased. The contents of chlorophyll a, chlorophyll b and carotenoid in leaves of L. esculentumChaojidamingxing(CJ) decreased by 62.13%, 71.24% and 66.52%, respectively. The contents of malondialdehyde (MDA) in leaves of different tomato varieties increased, especially L. esculentumZhongshu Ⅳ(ZS) increased by 747.47%.(3) The contents of soluble sugar and total fruit yield of tomatoes decreased by 4.03%～37.80% and 4.03%～37.80%.The contents of organic acids in fruits of tomato increased by 12.93%～301.67%, except for L. esculentumXiongbatianxia(XB). (4) The comprehensive response index of tomatoes to enhanced UV-B radiation was -55.46～242.00 with sequence: Tianzeshanghai 908F1(TZS) Tianzemaofen 802(TZM) Chaojidamingxin(CJ) Taiwanshengnv(TS) Yingtaoxiaofanqie(YT) Zhongsusihao Ⅳ(ZS) Tianhuangmingxin(TH) Xiongbatianxia(XB). In general, yield and quality of tomatoes decrease under enhanced UV-B radiation. Tomato Tianzeshanghai 908F1 is the most tolerant variety and tomato Xiongbatianxia is the most sensitive one.