摘要
用条斑紫菜壳孢子作材料，对室内（１０～２５℃，８～４５μｍｏｌｐｈｏｔｏｎｍ－２ｓ－１，１２Ｌ∶１２Ｄ）萌发的壳孢子苗进行观察，结果是：１０～２０℃，壳孢子苗形态正常，只有最靠近基部的细胞长出假根；而２５℃的不同光强下，相当比例的幼苗表现分段现象；每个藻段基部细胞有一个较大的液泡，细胞的长宽比接近１，从这一细胞长出假根的现象较普遍。假根长出的方向多数向着藻体的基部，个别向着藻体端部。非基部假根的产生有两个必要的条件：（ａ）壳孢子苗是形态嵌合体；（ｂ）培养温度是２５℃。这一现象在紫菜中首次报道，并对其出现的普遍性和产生机理进行了讨论。
Conchosporelings of Porphyra yezoensis were cultured indoors (10￣25℃, 8￣45 μmol photon m -2 s -1 , 12L∶12D), the results showed that at 10￣20℃, the conchosporelings showed normal growth and only the basal cell of the individual grew out rhizoids. However, at 25℃, a considerate proportion of conchosporelings showed blocked growth. Each block had a comparatively big basal cell with a big vacuole. The basal cell was narrower than the other cells of the same block and its length to width ratio was near to 1. The basal cell often grew out a rhizoid. The growth direction of the rhizoid was mostly towards the base of the thallus, and seldom towards the apex of the thallus. This phenomenon occurred when two requisites existed: conchosporelings were morphological chimera and cultured at 25℃, which could be approached only under the indoor condition. The possible significance of this phenomenon is discussed. This is the first report on this phenomenon in Porphyra.
基金
国家攀登计划
关键词
紫菜
非基部假根
形态嵌合体
壳孢子幼苗
Porphyra yezoensis
non basal rhizoid
blocked growth
morphological chimera
