壶瓶枣叶片和果实持水力特性分析  

Water storage capacity of leaves and fruits of Hupingjujube

作　　者：杨建华[1] Yang Jianhua(Shanxi Academy of Forestry Sciences,Taiyuan 030012,China)

机构地区：[1]山西省林业科学研究院,山西太原030012

出　　处：《山西农业大学学报（自然科学版）》2018年第8期65-70,共6页Journal of Shanxi Agricultural University(Natural Science Edition)

摘　　要：[目的]为了研究不同时期壶瓶枣叶片和果实的持水力特性,探究其抗旱机理,同时也有利于完善红枣裂果的水分生理机制,分析了不同时期叶片和果实的水分变化规律。[方法]在果实白熟期、脆熟期、完熟期分6次采集壶瓶枣叶片、果实以及带叶片和果实的枣吊,采用脱重法分别测定其失水率。[结果]同一采样时期各处理间失水率差异达显著水平,24h叶片失水率为447.61~610.95mg·g-1,枣吊失水率为91.25~502.03mg·g-1,果实失水率为63.49~303.25mg·g-1;随着果实的成熟,24h果实失水率由8月17日303.25mg·g-1降低到10月6日的84.69mg·g-1,叶片的失水率变化不大(447.61~610.95mg·g-1),果实和叶片的持水能力差异呈增大的趋势;各处理失水率的Logistic回归方程的决定系数均大于0.98,曲线为"S"形,说明失水的过程经历了"慢-快-慢"的过程;除10月6日外,其它时期表现为叶片拐点时间>果实拐点时间>"果实+叶片"拐点时间,从而反应了不同处理失水过程的差异。[结论]枣果实持水力较强,叶片持水力较弱,当发生干旱时,枣树叶片失水较快,果实失水较慢。[Objective]Present study was aimed to explore the mechanism of drought resistance and to better understand the physiological mechanism of fruit splitting of Huping jujube by investigating the water storage capacity of leaves and fruits of plantsat different growth stage The dynamic changes in leaf and fruit water content at different developmental stages were analyzed.[Methods]Leaves,fruits,and shedding branches with both leaves and fruits of Huping jujube were collected at 10-day time interval starting from 17th August,and a total of six collections were conducted during fruit white-color stage,crisp ripening stage,and ripening stage.Collected materials were dehydrated,and weighed to determine the water content of each collection.[Results]A significant difference of moisture loss rate was observed among different samples collected at same time.Leaves lost moisture between 447.61 and 610.95 mg·g^-1 in 24 h post treatments,while shedding branches and fruits lost 91.25~502.03 mg·g^-1 and 63.49~303.25 mg·g^-1,respectively.The water loss rate of fruits h was reduced from 303.25 mg·g^-1 on August 17th to 84.69 mg·g^-1 on October 6th,while the water loss variation in leaves was small(447.61~610.95 mg·g^-1)during the same period of time.The coefficient of determination(R2)in logistic regression equations for water loss in all treatments were greater than 0.98,and the curve displayed a"S"-shape which indicated that the dehydration process of different parts showeda"slow-fast-slow"trend.The turning point of curves was appeared earlier in leaf samples,followed by fruits and then shedding branches,except the samples collected on October 6th.[Conclusion]Study results indicated that the water retention capacity in different parts of jujube plants are various.Fruits possess stronger water holding capacity than that of leaves.When the drought occurs,leaves will lose water faster than fruits.

关 键 词：壶瓶枣 叶片 果实 持水力 

分 类 号：S665.1[农业科学—果树学]