Dianthus chinensis L.: The Structural Difference between Vascular Bundles in the Placenta and Ovary Wall Suggests Their Different Origin.
Dianthus chinensis L.: The Structural Difference between Vascular Bundles in the Placenta and Ovary Wall Suggests Their Different Origin.
复制标题
DOI：
10.3389/fpls.2017.01986
复制
发表时间：
2017
影响因子：
5.6
通讯作者：
Gao RF
中科院分区：
文献类型：
--
作者：
Guo XM;Yu YY;Bai L;Gao RF
石竹是一种多年生草本植物，具有很高的观赏、植物学、生态和药用价值。D. chinensis由两个心皮和两个独立的花柱组成。胎座是一个柱状结构，延伸到成熟果实长度的三分之二，这是典型的石竹科。传统上认为，游离中央胎座是由隔膜消失的轴胎座演化而来，而轴胎座则是由边缘胎座与中央心皮融合而成。然而，这种传统的观点与近年来被子植物系统学研究的新成果越来越不一致。阐明D.中国雌蕊的解剖学研究。结果表明，杜父鱼胎盘血管系统与卵巢壁血管系统是独立的。中国。此外，在胎座的中央部分有一个或两个双棱束，在雌蕊中相应地有许多双棱束，这些双棱束提供胚珠/种子。胎座的中央周纹束与枝的中央周纹束相似，而与叶或其衍生物的中央周纹束不相似。因此，推测D. chinensis不是通过侧枝维管束的融合而起源于紫云英心皮，而是一个具有胚珠/种子的花轴侧向粘附。子房壁则是花轴的侧附属物。本研究结果与将胎座视为胚珠分支的统一理论完全一致。除了D。chinensis的胎座中也观察到类似的维管组织。但这种维管组织模式是否在整个被子植物中普遍存在，目前还不清楚。需要进行更深入和广泛的调查。
Dianthus chinensis is a perennial herbaceous plant with great ornamental, botanical, ecological, and medicinal value. The pistil of D. chinensis is composed of two fused carpels with free central placenta and two separate styles. The placenta is a columnar structure extending about two-thirds the length of the maturing fruit, which is typical of the Caryophyllaceous. Traditionally, free central placenta is thought to have evolved from axial placenta by septal disappearance, and axial placenta to have occurred through fusion of conduplicate carpels with marginal placenta. However, the traditional opinion is becoming more and more inconsistent with the new data gained in recent research of angiosperm systematics. To clarify the origin of D. chinensis pistil, the present anatomical study was carried out. The results show that the vascular system of placenta is independent to that of the ovary wall in D. chinensis. Moreover, in the central part of placenta there are one or two amphicribral bundles, and correspondingly numerous ones in the pistil which supply the ovules/seeds. It is obvious that the central amphicribral bundles in placenta are comparable to the counterparts in branches but not to those in leaves or their derivatives. Therefore, it is reasonable to deduce that the placenta of D. chinensis was not derived from conduplicate carpels through fusion of collateral vascular bundles, and actually a floral axis with ovules/seeds laterally adhering. On the contrary, the ovary wall was the lateral appendages of the floral axis. The result of the present study is completely in agreement with Unifying Theory, in which the placenta is taken as an ovule-bearing branch. Except for D. chinensis, the similar vascular organization has been observed in placenta of numerous isolated taxa. But till now, it is uncertain that whether this vascular organization pattern is popular in the whole angiosperms or not. More intensive and extensive investigations are needed.
登录
查看更多内容
影响因子：
3
作者：
BUELL, KM
通讯作者：
BUELL, KM
影响因子：
3
作者：
Douglas, GE
通讯作者：
Douglas, GE
影响因子：
9.4
作者：
EAMES, ARTHUR J.
通讯作者：
EAMES, ARTHUR J.
DOI：
10.1007/s40502-014-0104-9
发表时间：
2014-09-01
期刊：
Indian Journal of Plant Physiology
影响因子：
--
作者：
Dar, Riyaz Ahmad;Tahir, Inayatullah;Ahmad, Syed Sabhi
通讯作者：
Ahmad, Syed Sabhi
影响因子：
--
作者：
KAPOOR, LD
通讯作者：
KAPOOR, LD