Tyloses and ecophysiology of the early carboniferous progymnosperm tree Protopitys buchiana.
Tyloses and ecophysiology of the early carboniferous progymnosperm tree Protopitys buchiana.
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DOI：
10.1093/aob/mcg068
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发表时间：
2003-05
期刊：
影响因子：
4.2
通讯作者：
S. Scheckler;J. Galtier
中科院分区：
文献类型：
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作者：
S. Scheckler;J. Galtier
早石炭世原生植物buchiana的树干显示了最早的tylose形成的例子和最早的前裸子植物记录。原生泰柏在树干内侧和生长层边界附近分布较密。因此，我们认为，在休眠和/或水分胁迫后，活射线细胞的生理状态改变是使树木容易形成tylose的必要条件。再加上丰富的木材射线薄壁分布和邻近的大型木质部传导细胞，这些充满泰氨酸的导管的位置可以解释为植物对当地环境变化的生态生理反应。此外，一些木质部的传导细胞可能具有导管的功能。真菌菌丝存在于一些气管细胞和一些有霉病的区域，但没有木材损伤的证据；因此，我们得出结论，这些特殊的泰洛斯病例可能不是由伤口创伤引起的。因此，原始木的结构/功能与现代木材的血管相似，例如双梗被子植物的血管。这意味着古代和现代植物的生态生理反应与其细胞结构的物理参数密切相关。
Trunk woods of Early Carboniferous Protopitys buchiana show the earliest example of tylose formation and the first record for a progymnosperm. Protopitys tyloses are more densely located in inner trunk woods and near growth layer boundaries. We suggest, therefore, that an altered physiological state of living ray cells, during dormancy and/or following water stress, was necessary to make the woods vulnerable to tylose formation. Coupled with the distribution and proximity of abundant wood ray parenchyma to large xylem conducting cells, the positions of conduits filled with tyloses can be interpreted as ecophysiological responses of the plant to changes in local environment. In addition, some xylem conducting cells might have functioned as vessels. Fungal hyphae are present in some tracheary cells and in some areas with tyloses, but there is no evidence for wood trauma; we conclude, therefore, that these particular cases of tyloses are probably not induced by wound trauma. Protopitys buchiana wood thus shows structure/function similarities to modern woods with vessels, such as those of dicot angiosperms. This implies that ancient and modern plant ecophysiological responses correlate well with the physical parameters of their cellular construction.