文献类型：期刊文献

英文题名：Vascular anatomy of kiwi fruit and is implications for the origin of carpels

作者：Guo, Xue-Min[1] Xiao, Xiao[1] Wang, Gui-Xi[2] Gao, Rong-Fu[3]

第一作者：Guo, Xue-Min

通信作者：Guo, XM[1]

机构：[1]Hebei Normal Univ Sci & Technol, Coll Life Sci & Technol, Qinhuangdao 066600, Hebei, Peoples R China;[2]Chinese Acad Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Res Inst Forestry, Beijing, Peoples R China;[3]Beijing Forestry Univ, Coll Life Sci & Technol, Beijing, Peoples R China

年份：2013

卷号：4

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000331438500001)】；

语种：英文

外文关键词：angiosperm; placenta; origin; comparative anatomy; kiwi fruit

摘要：Kiwi fruit is of great agricultural, botanical, and economic interest. The flower of kiwi fruit has axile placentation, which is typical for Actinidiaceae. Axile placentation is thought derived through fusion of conduplicate carpels with marginal placentation according to the traditional doctrine. Recent progress in angiosperm systematics has refuted this traditional doctrine and placed ANITA clade rather than Magnoliaceae as the basalmost clade. However, the former traditional doctrine stays in the classrooms as the only teachable theory for the origin of carpels. To test the validity of this doctrine, we performed anatomical study on kiwi fruit. Our study indicates that the placenta has a vascular system independent of that of the ovary wall, the ovules/seeds are attached to the placenta that is a continuation of floral axis enclosed by the lateral appendages that constitute the ovary wall, and there are some amphicribral bundles in the center of placenta and numerous amphicribral bundles supplying ovules/seeds in kiwi fruit. The amphicribral vascular bundles supplying the ovules/seeds are comparable to those usually seen in branches, but not comparable to those seen in leaves or their derivatives. This comparison indicates that the placenta in kiwi fruit cannot be derived from the fusion of collateral ventral bundles of conduplicate carpels, as suggested by traditional doctrine. Instead the vascular organization in placenta of kiwi suggests that the placenta is a shoot apex-bearing ovules/seeds laterally. This conclusion is in line with the recently raised Unifying Theory, in which the placenta is taken as an ovule-bearing branch independent of the ovary wall (carpel in strict sense). Similar vascular organization in placenta has been seen in numerous isolated taxa besides kiwi fruit. Therefore whether such a pattern is applicable for other angiosperms is an interesting question awaiting answering.