【摘要】 龙眼茎受冻害后,细胞组织受害症状由轻至重逐渐发展,维管形成层区受害最为严重,大部分细胞收缩变形及至破裂解体,使木质部与韧皮部分离。气温回升后,形成层受冻害已褐变但尚未干枯的茎,可从受伤的形成层区产生愈伤组织继而从愈伤组织产生新的维管形成层,使茎重新恢复生长。更多还原

【Abstract】 After Dimocarpus longan Lour.stem was subjected to freezing injury,the injured symptom of cells and tissues was gradually aggravated, especially in vascular cambium.Most cells of D. longan Lour.stem would shrink and distort,and develop into break and disorganization, which caused the seperation between xylem and phloem.With the temperature’s rising again, the stem,which became grown in appearance because of freezing injury but was not wizened,could derive callus from its injured cambium,and then callus generated new vascular cambium,which could make injured stem recover its growth.更多还原