| 引用本文: | 胡 梦, 谭 露, 王清海, 杜含梅, 李声春, 徐 洲, 吴丹丹, 王安虎.中国荞麦属11种植物的花粉形态及其分类学意义[J].广西植物,2025,45(12):2296-2307.[点击复制] |
| HU Meng, TAN Lu, WANG Qinghai, DU Hanmei, LI Shengchun,
XU Zhou, WU Dandan, WANG Anhu.Pollen morphology and taxonomic significance of 11 Fagopyrum species(Polygonaceae)from China[J].Guihaia,2025,45(12):2296-2307.[点击复制] |
|
| |
|
|
| 本文已被：浏览 248次 下载 69次 |
码上扫一扫！ |
|
|
| 中国荞麦属11种植物的花粉形态及其分类学意义 |
|
胡 梦1,2, 谭 露2, 王清海2, 杜含梅2, 李声春2, 徐 洲2, 吴丹丹1, 王安虎2*
|
|
1. 四川农业大学 小麦研究所, 成都 611130;2. 西昌学院 攀西特色作物研究与利用四川省重点实验室, 四川 西昌 615000
|
|
| 摘要: |
| 荞麦属植物是栽培荞麦作物遗传改良的基因库,但该属的系统位置及物种鉴定存在争议。为探讨荞麦属花粉的形态特征及其分类学意义,通过扫描电镜观察了荞麦属11种及2亚种的花粉形态特征,结果表明:(1)13个样品的花粉形状为长球形或近球形,花粉大小在种间差异较明显,甜荞野生近缘种和细柄野荞麦的花粉为大粒,花叶野荞麦的花粉为小粒,其余10种的花粉均为中等。(2)花粉外壁纹饰均为细网状,但种间的花粉表面网眼大小和密度存在明显差异。(3)聚类分析的结果显示,苦荞野生近缘种、线叶野荞麦、栽培苦荞麦、硬枝野荞麦和花叶野荞麦的花粉形态相似,萌发沟长和宽均较小,花粉形状为近球形或长球形,花粉为中等大小或小; 密毛野荞麦、疏穗野荞麦、长柄野荞麦、灌野荞麦、金荞麦和理县野荞麦的花粉形态相似,萌发沟长和宽均为中等,花粉形状为近球形或长球形,花粉均为中等大小; 而甜荞野生近缘种与细柄野荞麦花粉形态相似,并共同具有一系列显著特征,可与属内其他物种明显区分。二者的花粉外壁纹饰表现为网眼最宽、网脊最宽、网眼尺寸最大,同时萌发沟的长度和宽度也均为最大。花粉形状为长球形,其花粉粒尺寸在所研究的物种中属于大型花粉粒。该研究结果表明,荞麦属植物花粉具有形状为长球形或近球形、外壁纹饰呈细网状、萌发沟为三孔沟等共同特征,明显区别于广义蓼属其他植物,可以作为该属系统地位的参考依据。花粉形态虽然存在一定种间差异,但分辨率较低不足以用于确定种的分类地位。 |
| 关键词: 荞麦属, 花粉形态, 花粉外壁纹饰, 聚类分析, 分类学 |
| DOI：10.11931/guihaia.gxzw202406029 |
| 分类号:Q944 |
| 文章编号:1000-3142(2025)12-2296-12 |
| 基金项目:四川省科技厅项目(2023YFN0019); 西昌学院博士启动项目(YBZ202335); 厅州共建攀西特色作物研究与利用四川省重点实验室发展基金项目(XNFZ2201,SZ21ZZ05)。 |
|
| Pollen morphology and taxonomic significance of 11 Fagopyrum species(Polygonaceae)from China |
|
HU Meng1,2, TAN Lu2, WANG Qinghai2, DU Hanmei2, LI Shengchun2,
XU Zhou2, WU Dandan1, WANG Anhu2*
|
|
1. Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China;2. Panxi Crops Research and
Utilization Key Laboratory of Sichuan Province, Xichang University, Xichang 615000, Sichuan, China
|
| Abstract: |
| Fagopyrum plants serve as a gene pool for the genetic improvement of cultivated buckwheat, but the phylogenetic status and species identification within this genus remain controversial. To explore the morphological characteristics of Fagopyrum and its taxonomic significance, the pollen morphology of 11 species and 2 subspecies of Fagopyrum was observed using scanning electron microscope. The results were as follows:(1)The pollen shape of the Fagopyrum species varied from subspheroidal to prolate, and the pollen sizes varied significantly among species, of which, the pollen of F. tataricum ssp. potanini and F. gracilipes were big, that of F. callianthum was small, that of the rest were medium-sized.(2)The pollen exine ornamentation was finely reticulate in all species. However, there were obvious differences in the size and density of pollen surface perforation among different species.(3)Cluster analysis showed the pollen morphology of F. tataricum ssp. potanini, F. lineare, F. tataricum, F. urophyllum, and F. callianthum had similar characteristics, such as the germination furrow was small in length and width, the pollen shape was subglobose or oblong, and the pollen size was medium or small. F. densovillosum, F.caudatum, F. statice, F. rubifolium, F. dibotrys, and F. macrocarpum were similar, with some characteristics, such as germination furrow of medium length and width, pollen shape subglobose or oblong, and all having medium-sized pollen, while the pollen morphology of F. esculentum ssp. ancestralis and F. gracilipes were similar and distinct from other congeners, characterized by the widest lumina, broadest murus, largest lumina size, and the longest and widest germinal apture. The grains were prolate and ranked as the largest in size among all species examined. In conclusion, the pollen of Fagopyrum has the common characteristics of subglobose or oblong shape, exine ornamentation is finely reticulate, tricolporate aperature, which are clearly different from other genera of Polygonum, which means that it can be used as a reference to determine the phylogenetic status of this genus. Although there are differences in pollen morphology between taxa, the low resolution is not enough to distinguish the species of Fagopyrum. |
| Key words: Fagopyrum, pollen morphology, exine ornamentation, cluster analysis, taxonomy |
|
|
|
|
|
