基于当年生枝木质部解剖结构的扁桃品种栓塞抗性分析

Xylem Embolism Resistance of Different AlmondCultivars Based on the Xylem Anatomical Characteristics of Current-Year Shoot

以当年生枝木质部解剖结构特征分析扁桃不同栽培品种的抗栓塞能力,可为深入了解扁桃干旱胁迫适应机制提供理论参考。利用光学显微镜解析扁桃当年生枝木质部组织解剖结构特征,通过隶属函数方法对扁桃不同品种的抗栓塞能力进行初步评价。结果表明:1)不同生态类群扁桃品种当年生枝木质部导管直径(D)、导管水力直径(Dh)、导管密度(VD)、单导管指数(Vs)和木材密度(WD)间存在极显著性差异(P<0.01),美国品种当年生枝WD和Vs高于新疆地方品种,而新疆地方品种D和VD极显著大于美国品种(P<0.01)。2)抗栓塞能力由高到低排序为S3>M7>M2>M1>M8>S14>S1>S9>S12,即美国品种的木质部抗栓塞能力高于新疆地方品种(除S3以外)。

The xylem embolism resistance is one of the important indicators of drought resistance evaluation of woody plants, which is closely related to the anatomical structure of xylem.The embolism resistance abilities of 9 different almond(Amygdalus communis) cultivars were evaluated from the xylem anatomical structure of the current-year shoots to provide a theoretical references for further understanding the adaptation strategies of almond to drought stress environment.The xylem anatomical structures were observed by optical microscopy and the embolism resistance ability was evaluated by the subordinate function method.The results showed that 1) there was significant differences in some xylem anatomical features among different ecological groups(P<0.01),such as vessel diameter(D),vessel hydraulic diameter(Dh),vessel density(VD),solitary vessel index(Vs) and wood density(WD).The xylem of current-year shoots of American varieties had higher WD and Vs values than those of Xinjiang local varieties(P<0.05);the D and VD values of Xinjiang local varieties were higher than American varieties.2) The order of embolism resistance ability was S3>M7>M2>M1>M8>S14>S1>S9>S12,and it was preliminarily determined that the current-year shoot xylem of American almond varieties had the higher ability of embolism resistance, while Xinjiang local varieties(expect for S3) had the relatively vulnerable xylem of embolism.