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在落叶松引种和试验种源时,由于产地不同,苗木的寒害很不一样,苗木抗害性的发展可分成二或三个连续的驯化阶段,在此期间因苗木的生长、代谢、糖类、蛋白、氨基酸等等不断发生变化,抗寒性逐步提高。为探索落叶松苗木抗寒过程,我们仅从①高生长停止期即苗木封顶时;②直径生长停止期,以茎部形成层与木质部、韧皮部界限清晰时为准,并借显微化学试验了解;③茎部细胞中淀粉变化;④木质部细胞壁木质化进程等四个方面进行形态观察和解剖分析。兹将观察方法、结果及初步结论整理于后,供参考。
Larch in the introduction and testing of provenance, due to different origin, seedling chilling is very different, the development of seedling resistance can be divided into two or three successive stages of domestication, during which the seedling growth, metabolism, carbohydrates , Protein, amino acids, etc. constantly changing, cold resistance gradually increased. To explore the larch seedlings cold-resistant process, we only from the high growth stop when seedling cap; ② diameter growth stop to the stem formation and the xylem, phloem boundaries clear, and by micro-chemical test understanding ; ③ stem cell starch changes; ④ xylem cell wall lignification process and other aspects of morphological observation and anatomical analysis. I will observe the method, the results and preliminary conclusions sorted, for reference.