Anatomical studies on seed coats with characteristic patterns in subfamilies Caesalpinioideae and Mimosoideae (Leguminosae) in relation to their function and phylogeny

本文对云实亚科和含羞草亚科种子表面的纹孔和纹孔进行了解剖学研究和比较1.通过对19属67种植物种子的解剖学研究，得到以下结果：（1）侧隙-小隙型种子分为两类：一种具有作为没有裂纹的线的胸膜造影片，所述裂纹是种皮中两种不同组织结构的边界（“无裂纹胸膜造影片”），而另一种具有作为裂纹的胸膜造影片（“裂纹胸膜造影片”）。这两种类型都存在于云实亚科，而只有后者存在于含羞草亚科。(2)No裂纹型胸膜片周围组织学差异较大，而无裂纹型胸膜片和凹坑型胸膜片的种子组织学差异较大。（3）裂纹胸膜片仅见于云实亚科的双果组属，根据最近的分子生物学资料，该属位于与含羞草亚科最近的位置。裂纹胸膜造影也支持该群的系统地位。（4）种皮全层破裂线从深度上可分为两种类型。深断裂线位于蜂窝或坑内，浅断裂线位于外围。（5）云实亚科决明子、番泻叶和决明3个近缘属的种皮，虽然具有不同的种子表面形态，但在解剖学特征上具有相似性，在结构上相互联系。（2）合欢属、番泻叶和决明属种子浸水后的水分渗透试验表明：（1）裂纹胸膜像与水分渗透无关。（2）无裂纹胸膜片和纹孔与滤水无直接关系，但对种皮软化有一定作用。

Pleurogram-areole and pitted patterns on seed surface were anatomically investigated and compared in subfamilies Caesalpinioideae and Mimosoideae (Leguminosae) in relation to their function and phylogeny.1.From anatomical investigations on seeds from 19 genera 67 species, the following results were obtained :(1)Two types were recognized in seeds with pleurogram-areole pattern : one has the pleurogram as a line without crack which is the border of two different tissue structures in the seed coat ("non-crack pleurogram") and the other has the pleurogram as a crack ("crack pleurogram"). The both types are found in Caesalpinioideae, while only the latter found in Mimosoideae. (2)No histological difference was found around the crack pleurogram, while obvious histological differences were found in seeds with non-crack pleurogram or pitted pattern.(3)The crack pleurogram was found only in genera of Dimorphandra group in Caesalpinioideae, which is located on the closest position to the Mimosoideae on the basis of recent molecular data. The crack pleurogram also supports the phylognetic position of the group. (4)Two types were recognized in fracture lines, which are borne on the whole seed coat, by the depth. Deep fracture lines were found within the areole or the pit, while the shallow one outside the area. (5)The seed coats of three allied genera Cassia, Senna and Chamaecrista in subfamily Caesalpinioideae, although they have different seed surface patterns, were structurally connected to each other by similarity in anatomical features.2.From water infiltration test after immersing seeds in water using Albizia, Senna and Chamaecrista, the following functional features were suggested :(1)The crack pleurogram has no relation to water infiltration. (2)The non-crack pleurogram and the pit have no direct relation to water filtration but they appear to contribute to soften seed coat.