Page 14 - 《广西植物》2025年第7期
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1 2 0 6 广 西 植 物 45 卷
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CHEN Dongliang ꎬ TAN Yurong ꎬ ZHANG Jiaoping ꎬ SUN Zudong ꎬ
1 1 1∗
YANG Shouzhen ꎬ TANG Xiangmin ꎬ ZENG Weiying
( 1. Institute of Cash Cropsꎬ Guangxi Academy of Agricultural Sciencesꎬ Nanning 530007ꎬ Chinaꎻ
2. Nanjing Agricultural Universityꎬ Nanjing 210095ꎬ China )
Abstract: YUC2 was one of the rate ̄limiting enzymes in auxin biosynthesisꎬ and it involved in plant response to shade
stress. In this studyꎬ ‘ Gongdou 7’ꎬ an extremely shade ̄tolerant soybean variety was used for clone of GmYUC2
gene. Based on the resequencing data and the phenotypic identification data of shade tolerance index (STI) in three
environments of 394 natural variation populations of soybean in southern Chinaꎬ this research analyzed the natural
variation of GmYUC2 gene to respond shade stress in soybeanꎬ and developed KASP molecular markers. The results were
as follows: (1) The length of CDS sequence for GmYUC2 gene cloned from ‘Gongdou 7’ was 1 148 bpꎬ it encoded 382
amino acidsꎬ all the encoded proteins contained domains including FMO ̄likeꎬ Pyr ̄redox ̄2 and Pyr ̄redox ̄3. (2) There
existed four SNP variation sites in gene GmYUC2ꎬ three SNP variants were located in the intron and one SNP variant was
2
located in the 5_prime_UTR regionꎬ SNP2 and SNP3 had the highest linkage degree (r = 0.988 8)ꎬ followed by SNP1
2 2
and SNP4 (r = 0.921 934)ꎬ SNP1 and SNP2 had the lowest linkage degree (r = 0.475 691). (3) Four haplotypes were
identified in 394 populations based on these four SNP sitesꎬ the Hap1 haplotype was consistent with the reference
genome Wm82ꎬ and Hap2ꎬ Hap3ꎬ and Hap4 were all directly mutated from Hap1ꎬ the STI of soybean germplasm
corresponding to Hap2 was extremely significantly less than that of Hap1ꎬ indicating that the soybean germplasm carrying
Hap2 haplotype had better shade ̄tolerance than that carrying Hap1. (4) Under shady conditionsꎬ the expression of gene
GmYUC2 was up ̄regulated in both extremely shade ̄tolerant germplasm and negative shade ̄tolerant germplasmꎬ and the
expression of gene GmYUC2 was significantly higher in extremely shade ̄tolerant germplasm than that in negative shade ̄
tolerant germplasm. (5) The KASP molecular marker developed by three SNP mutation sites of gene GmYUC2 was used
to verify 18 soybean materialsꎬ the identification results of genotype and phenotype were highly consistent with 88.
89%. The study cloned GmYUC2 gene successfullyꎬ and found that GmYUC2 gene played an important role in soybean
response to shade stressꎬ the KASP molecular marker developed could be used to identify shade ̄tolerance of soybean
resources at seedling stage. This study provides a reference for further analysis of the main function and expression
regulation mechanism of gene GmYUC2ꎬ and provides a theoretical basis for molecular marker ̄assisted breeding of shade
tolerance in soybean.
Key words: soybeanꎬ GmYUC2 geneꎬ shade ̄tolerantꎬ natural variationꎬ KASP molecular marker
间套种是我国南方大豆种植的重要模式ꎬ大 (孙祖东等ꎬ2017ꎻ 宋丽君等ꎬ2021)ꎬ而有关大豆
豆与玉米等高秆作物间套作是缓解中国大豆种植 耐荫性分子标记辅助鉴定的报道极少ꎮ 因此ꎬ深
面积短缺的有效途径之一( 杨文钰ꎬ2021)ꎮ 然而ꎬ 入挖掘大豆荫蔽胁迫响应基因的功能ꎬ分析基因
大豆与玉米、甘蔗、木薯等高秆作物间套作时ꎬ来 序列特征及表达模式ꎬ开发大豆耐荫性鉴定的高
自高位作物的荫蔽胁迫对大豆生长和防御极为不 效分子标记ꎬ对于深入解析大豆耐荫性形成机理
利(Liu et al.ꎬ 2016)ꎬ是推广大豆间套作模式的最 及大豆耐荫生物育种具有重要意义ꎮ 植物激素在
大障碍ꎬ因此对大豆耐荫性的解析尤为重要ꎮ 大 植物荫蔽胁迫响应过程中扮演着关键角色( 帅海
豆耐荫性被认为是受多基因控制的数量性状ꎬ目 威等ꎬ2018)ꎬ在众多参与调控荫蔽胁迫响应的植
前研究者已挖掘出不少与大豆耐荫性相关的候选 物激素中ꎬ生长素 3 ̄吲哚乙酸(3 ̄indoleacetic acidꎬ
基因( 张志鹏ꎬ2019ꎻ 曾维英等ꎬ2021ꎻ Qin et al.ꎬ IAA)是植物幼苗时期调控下胚轴伸长以适应荫蔽
2023ꎻ Su et al.ꎬ 2024)ꎬ但这些候选基因的功能验 胁迫最关键的植物激素( Cheng et al.ꎬ 2007ꎻ Fan
证及表达调控模式有待进一步深入研究ꎮ 此外ꎬ et al.ꎬ 2020)ꎮ 黄素单加氧酶( yucasinꎬYUC) 是色
目前大豆耐荫性鉴定多采用田间表型鉴定的方法 氨酸依赖途径中生长素合成的限速酶(Zhao et al.ꎬ

