桃3种砧木次生木质部导管分子性状比较

Comparison of the character of vessel elements in secondary xylem among three peach rootstocks in China

为桃树抗寒砧木的选择提供参考依据,采用组织离析、显微照相与生物计量统计法,检测并比较了山桃(Prunus davidiana)(SP)、毛桃(P.persica)(MP)和珲春桃(P.persica cv.Hun-chun-tao)(HP)3种桃砧木根与茎导管分子形态和大小。结果表明,3种桃砧木导管分子性状相比较,根与茎导管分子侧壁次生增厚和木质化的方式、纹孔式、穿孔板类型以及其根一端具尾的导管分子比例基本相似,其茎导管分子均具有螺旋加厚现象,但是,两端具尾、一端具尾、两端无尾、两端倾斜、一端倾斜和两端水平的导管分子比例以及导管分子的长度与直径、根与茎导管分子长度与直径的比率均存在差异。

To provide a basis for the selection of peach cold-resistant rootstock, the shape and size of vessel elements in root and stem from three typical peach rootstocks, Prunus davidiana （SP）, P. persica （MP） and Prunus persica cv. Hun-chun-tao （HP）, were examined using tissue segregation procedure, micrograph and biometric statistical method. The results showed that there were no obvious differences in the mode of secondary wall thickening and lignifications, pitting pattern, and types of perforation plates in both of root and stem among all three rootstocks, and the proportion of vessel element with one tail in all three roots and spiral thickening phenomenon in all three stems were similar. However, the proportions of vessel element without tail, with two tails, one tail, two slantwise end walls, one slantwise end wall, two horizontal end walls, the length and diameter of vessel element, and the length and diameter ratio of vessel element were different in root and stem among the three peach rootstocks.