地毯草优良种质耐荫性评价

Evaluation of shade tolerance in superior germplasms of Axonopus compressus

摘要

为探究地毯草（Axonopus compressus）的耐荫特性，本研究以华南地毯草为对照品种，对6份优良地毯草种质（A03、A12、A58、A59、A69、A135）进行耐荫性评价，为地毯草的耐荫品种选育提供理论依据。采用水培法，设置遮荫75%（T75）和自然光照（CK）2个处理，在处理28 d后测定各个种质的叶绿素含量、叶长、叶宽、生物量、坪用质量等18个指标并进行综合评价。结果表明：相比对照组，地毯草在遮荫75%胁迫下叶长显著增加，而叶宽、叶绿素含量、草层高度、生物量及坪用质量等指标显著降低。同时，通过综合分析将地毯草种质资源分为耐荫型、中度耐荫型和敏感型3类。其中，A69的耐荫性最强，与A03及对照品种同为耐荫型；A58、A59属于中度耐荫型，其耐荫性表现不及对照品种；A12和A135为敏感型，其耐荫性最差。

Abstract

To investigate the shade tolerance of Axonopus compressus, shade tolerance evaluation was performed on six accessions of superior Axonopus compressus germplasm (A03, A12, A58, A59, A69, A135) with Axonopus compressus ‘Huanan’ as the control variety, so as to provide a theoretical basis for breeding shade-tolerant varieties of A. compressus. A. compressus was treated with 75% shading or natural light under hydroponic culture and 18 indicators including chlorophyll content, leaf length, leaf width, biomass, and turf quality were measured after 28 days of treatment for comprehensive evaluation. The results show that compared to the control group, the 75% shading stress treatment, significantly increased the leaf length, but significantly decreased, leaf width, chlorophyll content, turf height, biomass, and turf quality ofA. compressus. Comprehensive analysis showed that the germplasm accessions were classified into three categories: shade-tolerant, moderately shade-tolerant, and shade-sensitive. Among them, Accession A69 exhibited the highest shade tolerance and was listed in, the shade-tolerant category along with Accession A03 and the control variety; Accessions A58 and A59 were listed in the moderately shade-tolerant category; Accessions A12 and A135 were listed in the shade-sensitive category, demonstrating the poorest shade tolerance.

关键词

地毯草 / 耐荫性 / 综合评价 / 种质筛选

Key words

Axonopus compressus / shade tolerance / comprehensive evaluation / germplasm screening

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基金资助

国家自然科学基金项目(32060409)

海南大学生态文明协同创新中心项目(XTCX2022STC10)

海南省科技人才创新基金项目(KJRC2023C21)