Heo Kweon, Kimoto Yukitoshi, Riveros Magaly, Tobe Hiroshi
Division of Applied Plant Sciences, Kangwon National University, Chuncheon, Korea.
J Plant Res. 2004 Jun;117(3):221-8. doi: 10.1007/s10265-004-0149-3. Epub 2004 Apr 15.
The embryological characteristics of Gomortegaceae, which are poorly understood, were investigated on the basis of Gomortega nitida, the only species of the family, to understand better the evolution of this group within Laurales. Comparisons with other Laurales and Magnoliales (a sister group of Laurales) show that Gomortega has many embryological features in common with the other lauralean families. Notably, Gomortega shares a testa without or with at best only a poorly developed mesotesta as a synapomorphy with all other Laurales. The genus further shares anthers dehisced by valves as a synapomorphy with the other Laurales (except for Calycanthaceae and Monimiaceae), and a non-multiplicative testa and bisporangiate anther as synapomorphies with Atherospermataceae and Siparunaceae (although the non-multiplicative testa occurs as a homoplasy in Monimiaceae, and the bisporangiate anther in Monimiaceae pro parte, Lauraceae pro parte and Hernandiaceae, respectively). Gomortega shows simultaneous cytokinesis to form pollen grains, a one-celled ovule archesporium and non-specialized chalaza, all or part of which may be synapomorphies shared with Atherospermataceae. Gomortega appears to have no embryological autapomorphies, but further comparison with Atherospermataceae is required.
基于智利桂（Gomortega nitida）这一该科唯一的物种，对了解甚少的智利桂科（Gomortegaceae）胚胎学特征展开了研究，以便更好地理解该类群在樟目（Laurales）中的演化。与其他樟目植物以及木兰目（Magnoliales，樟目的姐妹类群）进行比较后发现，智利桂具有许多与其他樟目科植物共有的胚胎学特征。值得注意的是，智利桂与所有其他樟目植物一样，具有无中种皮或至多只有发育不良中种皮的种皮，这是一种共衍征。该属还与其他樟目植物（除蜡梅科和单室木科外）共有通过瓣裂开裂的花药这一共衍征，以及与澳樟科和杯轴花科共有非增殖性种皮和双孢子囊花药这一共衍征（尽管非增殖性种皮在单室木科中为同功相似，而双孢子囊花药分别在单室木科部分种类、樟科部分种类和莲叶桐科中出现）。智利桂表现出同时进行胞质分裂以形成花粉粒、单细胞胚珠原孢子和非特化合点，其中全部或部分特征可能是与澳樟科共有的共衍征。智利桂似乎没有胚胎学独征，但需要与澳樟科进行进一步比较。
