Experimental studies of growth and regenerative capacity in the foliose lichen Xanthoria parietina
Experimental studies of growth and regenerative capacity in the foliose lichen Xanthoria parietina
复制标题
DOI：
10.1111/j.1469-8137.1996.tb01926.x
复制
发表时间：
1996-08
期刊：
影响因子：
9.4
通讯作者：
R. Honegger
中科院分区：
文献类型：
--
作者：
R. Honegger
本研究通过在人工陶瓷基质上进行的一系列室外培养试验，研究了叶状地衣Xanthoria parietina（L.）日从生长的边缘假分生组织到被子囊盘覆盖的中心区域，沿沿着一条轴将其解剖。这背腹组织macrolichen（photobiont：Trebouxia arboricola德Puymaly）是能够再生新的裂片沿着伤口边缘或切割边缘在任何部分的叶状体，包括叶状体边缘apothecial磁盘。在半薄部分的中央叶状体区域的非干扰的叶状体，其中真菌和藻类细胞已经达到其成熟的尺寸，其中一个高比例的超大Trebouxia细胞意味着一个被捕的细胞周期，小岛屿的积极增长和分裂的真菌和藻类细胞被发现内的藻类层。这些可能是受伤后新叶原始阶段开始的部位。在自然界中，子囊壳覆盖着X.壁通常失去它们与底层的接触，并沿沿着干旱应力引起的裂缝断裂。当降落在一个合适的基质，分离的叶状体碎片被发现以同样的方式再生新的裂片人工解剖的样品，从而作为这种生态上非常成功的地衣物种的共生状态的繁殖体。
summary A series of outdoor culturing experiments on artificial ceramic substrata was set up to test the regenerative capacity of thallus fragments of the foliose lichen Xanthoria parietina (L.) Th. Fr. which had been dissected along an axis from the growing marginal pseudomeristem to the apothecia-covered central areas. This dorsiventrally organized macrolichen (photobiont: Trebouxia arboricola De Puymaly) is capable of regenerating new lobes along wound margins or cut edges in any part of the thallus, including the thalline margin of apothecial disks. In semithin sections of central thalline areas of non-disturbed thalli, where fungal and algal cells have reached their mature dimensions and where a high percentage of oversized Trebouxia cells imply an arrested cell cycle, small islets of actively growing and dividing fungal and algal cells were found within the algal layer. These are likely to be the sites where primordial stages of new lobes initiate after wounding. In nature, apothecia-covered central thalline areas of X. parietina usually lose their contact with the substratum and break off along drought-stress induced cracks. When landing on a suitable substratum, detached thallus fragments were found to regenerate new lobes in the same manner as artificially dissected samples, thus serving as propagules of the symbiotic state of this ecologically very successful lichen species.