Effects of Exogenous Sodium Silicate on Cold Tolerance of Citrus reticulata cv. Shatangju

FAN Qi-jun;NIU Ying;LIU Ping;LIU Bing-hao;LOU Bing-hai;CHEN Guo-ping;LENG Fu-chun;QIN Xu;Guangxi Citrus Biology Key Laboratory,Guangxi Academy of Specialty Crops;Guangxi Agriculture Department of Guangxi Zhuang Autonomous Region;

Citrus reticulata Blanco cv.Shatangju;;cold tolerance;;Sodium silicate

To elucidate the roles of Sodium silicate(Na2Si O3) in enhancing tolerance of cold stress(4 ℃) in Citrus reticulata Blanco cv. Shatangju, one-year old nursery cultured C. reticulata cv. Shatangju was used to investigate the physiological changes of plants exposing to 4 ℃ low temperature stress after pretreated with different Na2 Si O3concentration of 0 mmol / L,0.1 mmol / L, 1.0 mmol / L, 10.0 mmol / L and 20.0 mmol / L. The results showed that comparing with the control plants(0mmol / L Na2 Si O3), the Na2 Si O3pretreated plants had more chlorophyll and higher antioxidant activities of enzymes including SOD, POD. Relative conductivity was reduced. It is indicated that exogenous Na2 Si O3enhanced the cold tolerance of low temperature stress in C. reticulata cv. Shatangju. The 0.1 mmol / L pretreatment had the best effects.