Development and survival of leaves in Magnolia obovata in a deciduous broad-leaved forest in Hokkaido, northern Japan
Development and survival of leaves in Magnolia obovata in a deciduous broad-leaved forest in Hokkaido, northern Japan
复制标题
日本北部北海道落叶阔叶林中白玉兰叶子的发育和生存
作者：
K. Kikuzawa
确定了生长在日本北部北海道落叶阔叶林中的木兰枝条上的叶子数量以及顶芽中的原始和胚叶数量的季节变化。出叶方式为“齐头后继型”，即一芽中许多已形成的叶子同时出现，随后陆续出现几片叶子。基生叶的叶片在芽中败育，在萌芽后立即脱落。叶子出现停止后，茎尖叶的叶片脱落，留下包围芽的相同叶子的托叶。这种败育的叶片表明M. obovata的芽结构是从同源结构进化到异源结构的。木兰在许多类型的森林中一直存在，但在数量或体积上并未占主导地位。该物种通常出现在森林间隙，偶尔也到达林分的树冠。据推测，M. obovata 的芽结构已发生变化...
Seasonal changes were determined for leaf numbers on shoots and primordial and embryonic leaf numbers in terminal buds of Magnolia obovata growing in a deciduous broad-leaved forest in Hokkaido, northern Japan. Leaf-emergence pattern was "flush and succeeding type," i.e., many of the preformed leaves in a bud emerged at one time and after that several leaves appeared one by one successively. The lamina of the basal leaf was abortive in the bud and fell immediately after budbreak. The laminae of the shoot-tip leaves aborted after leaf emergence stopped, leaving stipules of the same leaves enclosing the bud. Such abortive laminae indicate that the shoot structure of M. obovata was evolved from homonomous to heteronomous structure. Magnolia obovata was consistently found in many types of forest but did not become dominant in number or in volume. This species was usually found in forest gaps and occasionally attained the canopy of the stand. Shoot structure of M. obovata was assumed to have changed in accorda...