基于形态学和ITS序列的新拟种膨胀碱蓬的分类学研究

Taxonomic investigation of a new putative species, Suaeda turgida G. L. Chu, based on morphological characteristics and ITS sequences

摘要

本研究以苋科碱蓬属新拟种膨胀碱蓬(Suaeda turgida G. L. Chu)为研究对象,在广泛开展针对性调查的基础上,通过形态学和基于nrITS序列的系统学研究,结合气候生态位分析,探究其分类学地位。结果表明:该物种主要分布在新疆准噶尔盆地古尔班通古特沙漠的沙丘、微盐碱平缓沙地,其生境与同属其他物种具有明显差异,为中国特有种;该种花期花被裂片具明显3脉、具3枚柱头等形态特征和系统发育分析结果均支持其隶属于显脉组(Suaeda Sect. Conosperma Iljin),与同组内其他物种不同的是其果期花被片无任何附属物且呈囊状干膜质;气候生态位结果显示其与碱蓬属内其他物种生态位分化程度明显,进一步为该种是碱蓬属内新物种提供生态学依据。

Abstract

This study takes the new putative species Suaeda turgida G. L. Chu (Amaranthaceae) as the research sabject. Based on extensive targeted investigations, its taxonomic status is explored through morphological studies, phylogenetic analysis based on nrITS sequences, and climate niche analysis. The results indicate that this species is mainly distributed in the sand dunes and slightly saline-alkali flat sandy areas of the Gurbantunggut Desert in the Junggar Basin of Xinjiang. Its habitat is significantly different from that of other species in the same genus, and it is endemic to China. Morphological features such as the three distinct veins on the flower petals during the flowering period and the presence of three stigmas, as well as the phylogenetic analysis results, all support its classification within the Suaeda Sect. Conosperma Iljin. Unlike other species in the same section, its fruiting period flower petals have no appendages and are sac-like and dry membranous. The climate niche analysis results show that its ecological niche is significantly differentiated from other species within the genus Suaeda, further providing ecological evidence for it being a new species within the genus Suaeda.

关键词

碱蓬属 / 新拟种 / 分类学 / 系统发育 / 生态位

Key words

Suaeda Forssk. ex J. F. Gmel. / new putative species / taxonomy / phylogeny / ecological niche

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基金资助

新疆维吾尔自治区草种质资源普查试点项目(CYZZ2025001);博州野生植物资源本底调查项目(横20240469)