French V
J Embryol Exp Morphol. 1984 Jun;81:185-209.
In many insects, grafting a larval leg onto the contralateral leg stump reverses one transverse axis and leads to the regeneration of supernumerary legs at each of the two points of maximum discrepancy on the graft/host junction. These operations were performed on the cricket Acheta domesticus, grafting between tibiae of pro- and metathoracic legs, and between tibia and tarsus, in order to deduce the mode of origin of the supernumeraries from their graft type, host type or composite structure. Supernumerary legs formed after A/P axis reversal are always half-and-half in structure, being of host type on the host side and graft type on the graft side, while supernumeraries formed after M/L axis reversal are variable in structure. These results are generally consistent with the recent Polar Co-ordinate Model (whereby supernumeraries form because the pattern of intercalation between graft and host generates two complete circumferences at the junction), provided that intercalation is restricted by the borders between anterior and posterior leg compartments. However there are features of the structure of the M/L supernumeraries which the Polar Co-ordinate Model does not explain. Medial supernumeraries are often of pure graft type (and lateral ones of host type) or half-and-half with anterior graft type and posterior of host type (while lateral supernumeraries often have the converse structure).
在许多昆虫中，将幼虫的一条腿移植到对侧的腿残端上会使一个横轴反转，并导致在移植/宿主连接处的两个最大差异点处各再生出多余的腿。这些操作是在家蟋蟀（Acheta domesticus）上进行的，将前胸和后胸腿的胫节之间以及胫节和跗节之间进行移植，以便从多余腿的移植类型、宿主类型或复合结构推断其起源方式。在前后轴反转后形成的多余腿在结构上总是一半一半，在宿主侧是宿主类型，在移植侧是移植类型，而在中侧轴反转后形成的多余腿在结构上则是可变的。这些结果总体上与最近的极坐标模型一致（即多余腿的形成是因为移植和宿主之间的插入模式在连接处产生了两个完整的圆周），前提是插入受到前后腿节之间边界的限制。然而，中侧多余腿的结构特征是极坐标模型无法解释的。内侧多余腿通常是纯移植类型（外侧的是宿主类型），或者是前半部分是移植类型后半部分是宿主类型（而外侧多余腿通常具有相反的结构）。
