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用差热分析(Differential thermal analysis: DTA)研究了山桃(Prunus davidiana)、杏(P. armeniaca)、青岛“粉红梅”(P.mume cv.’ Fenhong Mei,)、“小绿萼”(P.mume cv.’Small Green Calyx’)及其种问杂种“小绿萼”梅×山桃、青岛“粉红梅”×杏和杏×青岛“粉红梅”的低温放热(Low temperature exotherm)与冻害关系,以及皮部和木质部的冰冻类型(Freezing pattern)。在差热分析中,观察到亲本和杂种的木质部都有二次放热现象。低温放热后,引起木质部和髓射线薄壁细胞死亡,原生质膜透性急剧增加。在杂种与亲本之间,存在着明显的差异。分离的皮部却只出现一次高温放热(High temperature exotherm)。高温放热是与冻害无关的。文末讨论了梅花及其杂种在北京越冬的主要障碍及有关栽培措施。
Prunus davidiana, P. armeniaca, P.mume cv. ’Fenhong Mei,’ and ’Pseudoepithelium’ were studied by differential thermal analysis (DTA) .mume cv.’Small Green Calyx ’) and its intercropping “Little Green Calyx” plum × Peach, Qingdao “Pink Plum” × apricot and apricot × Qingdao “Pink Plum” low temperature exotherm and frost damage Relationship, and the Freezing pattern of the skin and xylem. In the differential thermal analysis, both the parent and the hybrid xylem were observed to have a second exotherm. Low temperature exothermic, causing xylem and medullary ray parenchyma cells died, the plasma membrane permeability increased dramatically. There is a clear difference between the hybrid and the parent. The isolated skin has only one high temperature exotherm. High temperature exotherm is nothing to do with frost damage. At the end of the paper, the main obstacles and the related cultivation measures of plum blossom and its hybrids overwintering in Beijing are discussed.