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Title:: Physiological Indexes Change Rule Loquat Under the Condition of Natural Growth Throughout the Year

Author(s):: FAN Meili; ZHANG Renfan; ZHANG Han; LU Zhoumin; (College of Forestry，Northwest Agriculture and Forestry University，Yangling，Shaanxi 712100)

Abstract:: Selecting 14yearold of ‘Nagasaki early’ loquat as test material,starting from the bud period（the end of August 2013) until the end of July 2014，collecting leaves from canopy outside to determine physiological indexes end of each month,and study the main physiological indexes change rule of the north rim loquat leaf.In order to study the physiological indexes change rules of the field environment loquat leaf throughout the year,reveal the relationship between physiological metabolism and season,air temperature,rainfall.The results showed that under drought stress the content of soluble protein，soluble sugar，proline were significantly increased,and SOD，POD activities were increased;when the temperature was the lowest the content of MDA,soluble protein,soluble sugar，proline and the SOD，POD and CAT activities achieved cycle peak.The chlorophyll content of new leaves were significantly lower than old leaves，PAL activity varies with temperature was lower and lower，PAL activity of new leaves was greater than the old leaves.Illustrating that when under the drought and low temperature stress environment the related physiological indexes in the body of loquat corresponding changed to actively cope with adversity environment.The material content and enzyme activity has certain differences between the new and old leaves,leaf physiological indexes showed the opposite change tendency with the rise of temperature and the increase of rainfall.