木藍屬（豆科）植物之胚胎學研究

Embryology of Indigofera (Fabaceae)

本文研究心臟葉木藍（Indigofera cordifolia）和細葉木藍（I. linifolia）的胚胎學。此兩種植物的花藥都具有四個小孢子囊，花藥壁是由表皮、中間層和營養層所構成，而營養層為分泌型，是由單核的單層細胞組成。當花粉粒在兩個細胞時期，藥室內壁行纖維狀加厚。小孢子母細胞減數分裂與質分裂後形成四面體型與交叉型的小孢子四分體。花粉粒具3孔，釋出時為兩個細胞時期。胚珠為彎生型，具雙珠被與厚珠心。大孢子母細胞減數分劣後形成線型的大孢子四分體。近合點的大孢子具功能，且發育為單孢子蓼型的胚囊，有三個暫時性的反足細胞。胚乳發育呈核型，而胚胎的發育則為Jobansen提出的柳葉菜型的椒草屬（Trifolium）變型，和Souége的Megarche-type VI型，第一階段，B2係列。

Embryology of Indigofera cordifolia and I. linifolia has been studied. The anthers are tetrasporangiate. The anther wall comprises of an epidermis, middle layer and tapetum. Anther tapetum is of the glandular type and the cells are uniseriate and uninucleate. Endothecium develops fibrous thickenings when the pollen grains are at 2-celled stage. Meiosis is normal and successive cytokinesis leads to the formation of tetrahedral and decussate microspore tetrads. Pollen grains are triporate and 2-celled at the time of shedding. The ovules are campylotropous, bitegmic and crassinucellate. Meiosis in megaspore mother cell leads to the formation of linear tetrad of megaspores. The chalaza] megaspore of the tetrad is functional and develops into monosporic Polygonum type of embryo sac. Antipodals are three in number and are ephemeral. Endosperm development is of the Nuclear type and the embryo development conforms to the Trifolium variation of the Onagrad type of Johansen and Period I, series B2 and Megarche type VI of Soueges.