Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (10): 2582-2596.doi: 10.16420/j.issn.0513-353x.2024-0790
• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles Next Articles
XIA Yan1, HU Ruoqian1,2, YI Guangquan1, SUN Hongwen1, HUANG Shuxin1, CHI Zhuoheng1, SHI Min3, LIANG Guolu1, JING Danlong1,*(
), GUO Qigao1,*(
)
Received:2025-06-20
Revised:2025-07-29
Online:2025-10-25
Published:2025-10-28
Contact:
JING Danlong, GUO Qigao
XIA Yan, HU Ruoqian, YI Guangquan, SUN Hongwen, HUANG Shuxin, CHI Zhuoheng, SHI Min, LIANG Guolu, JING Danlong, GUO Qigao. Characterization of Loquat bHLH Gene Family and Functional Analysis of EjbHLH104 on Flowering Regulation in Triploid Loquat[J]. Acta Horticulturae Sinica, 2025, 52(10): 2582-2596.
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URL: https://www.ahs.ac.cn/EN/10.16420/j.issn.0513-353x.2024-0790
Fig. 1 Morphological characterization of early-flowering triploid loquat‘Wuhe Zaoyu’ S1:Physiological differentiation of flower buds;S2:Morphological differentiation of flower buds;S3:Differentiation of the main inflorescence axis;S4:Differentiation of lateral inflorescence branches;S5:Rapid elongation of flower buds from lateral inflorescence branches;S6:Differentiation of florets;S7:White corollas of floral buds;S8:Full bloom. The same below
| 时期 Stage | 森尾早生 Moriowase | 常白1号 Changbai 1 | 无核早玉 Wuhe Zaoyu | 华玉无核1号 Huayu Wuhe 1 |
|---|---|---|---|---|
| 花芽生理分化期 Physiological differentiation of flower buds(S1) | 07-04—07-12 | 07-06—07-15 | 07-04—07-12 | 07-06—07-15 |
| 花芽形态分化期 Morphological differentiation of flower buds(S2) | 07-25—08-03 | 09-01—09-09 | 07-20—07-29 | 08-30—09-09 |
| 花序主轴分化期 Differentiation of the main inflorescence axis(S3) | 08-21—08-30 | 09-22—09-30 | 08-18—08-25 | 09-21—09-30 |
| 花序支轴分化期 Differentiation of lateral inflorescence branches(S4) | 09-04—09-12 | 10-12—10-15 | 08-29—09-07 | 10-10—10-15 |
| 花序侧生支轴的花芽快速伸长期 Rapid elongation of flower buds from lateral inflorescence branches(S5) | 09-17—09-26 | 10-18—10-21 | 09-11—09-19 | 10-19—10-22 |
| 小花分化期 Differentiation of florets(S6) | 10-04—10-09 | 10-25—10-29 | 09-22—09-29 | 10-25—10-30 |
| 花蕾露白期 White corollas of floral buds(S7) | 10-13—10-21 | 11-02—11-08 | 10-05—10-09 | 11-04—11-11 |
| 盛花期 Full bloom(S8) | 10-25—10-30 | 11-24—11-29 | 10-13—10-23 | 11-23—11-29 |
Table 1 The acquisition time of the flower panicles of four loquat cultivars
| 时期 Stage | 森尾早生 Moriowase | 常白1号 Changbai 1 | 无核早玉 Wuhe Zaoyu | 华玉无核1号 Huayu Wuhe 1 |
|---|---|---|---|---|
| 花芽生理分化期 Physiological differentiation of flower buds(S1) | 07-04—07-12 | 07-06—07-15 | 07-04—07-12 | 07-06—07-15 |
| 花芽形态分化期 Morphological differentiation of flower buds(S2) | 07-25—08-03 | 09-01—09-09 | 07-20—07-29 | 08-30—09-09 |
| 花序主轴分化期 Differentiation of the main inflorescence axis(S3) | 08-21—08-30 | 09-22—09-30 | 08-18—08-25 | 09-21—09-30 |
| 花序支轴分化期 Differentiation of lateral inflorescence branches(S4) | 09-04—09-12 | 10-12—10-15 | 08-29—09-07 | 10-10—10-15 |
| 花序侧生支轴的花芽快速伸长期 Rapid elongation of flower buds from lateral inflorescence branches(S5) | 09-17—09-26 | 10-18—10-21 | 09-11—09-19 | 10-19—10-22 |
| 小花分化期 Differentiation of florets(S6) | 10-04—10-09 | 10-25—10-29 | 09-22—09-29 | 10-25—10-30 |
| 花蕾露白期 White corollas of floral buds(S7) | 10-13—10-21 | 11-02—11-08 | 10-05—10-09 | 11-04—11-11 |
| 盛花期 Full bloom(S8) | 10-25—10-30 | 11-24—11-29 | 10-13—10-23 | 11-23—11-29 |
| 引物名称 Primer name | 序列(5′-3′) Sequence | 用途 Purpose |
|---|---|---|
| EjbHLH104F | ATGGGGGAATGGATAGAGTAT | EjbHLH104 CDS全长扩增Amplification of EjbHLH104 CDS |
| EjbHLH104R | CTAAGCAGCGGGGGGCCTAA | |
| qEjbHLH104F | AGAGTGTCCCCGCAAGAG | 实时荧光定量PCR Quantitative real-time PCR |
| qEjbHLH104R | GCATCATCAAGTATAGCAGCCT | |
| qEjactinF | AATGGAACTGGAATGGTCAAGGC | 定量PCR内参引物Primers for internal control |
| qEjactinR | TGCCAGATCTTCTCCATGTCATCCCA | |
| LEjbHLH104F | ggggtaccATGGGGGAATGGATAGAGTAT | 亚细胞定位载体构建Vector construction of subcellular localization |
| LEjbHLH104R | gctctagaAGCAGCGGGGGGCCTAA | |
| TEjbHLH104F | ggcgcgccATGGGGGAATGGATAGAGTAT | 转基因拟南芥载体构建Vector construction of transgenic Arabidopsis |
| TEjbHLH104R | gctctagaCTAAGCAGCGGGGGGCCTAA | |
| pFGC5941-35SF | TGAGACTTTTCAACAAAGGATAATT | 转基因植株鉴定Identification of transgenic Arabidopsis |
| pFGC5941-35SR | TGTCCTCTCCAAATGAAATGAAC |
Table 2 Primer sequences used for EjbHLH104 gene
| 引物名称 Primer name | 序列(5′-3′) Sequence | 用途 Purpose |
|---|---|---|
| EjbHLH104F | ATGGGGGAATGGATAGAGTAT | EjbHLH104 CDS全长扩增Amplification of EjbHLH104 CDS |
| EjbHLH104R | CTAAGCAGCGGGGGGCCTAA | |
| qEjbHLH104F | AGAGTGTCCCCGCAAGAG | 实时荧光定量PCR Quantitative real-time PCR |
| qEjbHLH104R | GCATCATCAAGTATAGCAGCCT | |
| qEjactinF | AATGGAACTGGAATGGTCAAGGC | 定量PCR内参引物Primers for internal control |
| qEjactinR | TGCCAGATCTTCTCCATGTCATCCCA | |
| LEjbHLH104F | ggggtaccATGGGGGAATGGATAGAGTAT | 亚细胞定位载体构建Vector construction of subcellular localization |
| LEjbHLH104R | gctctagaAGCAGCGGGGGGCCTAA | |
| TEjbHLH104F | ggcgcgccATGGGGGAATGGATAGAGTAT | 转基因拟南芥载体构建Vector construction of transgenic Arabidopsis |
| TEjbHLH104R | gctctagaCTAAGCAGCGGGGGGCCTAA | |
| pFGC5941-35SF | TGAGACTTTTCAACAAAGGATAATT | 转基因植株鉴定Identification of transgenic Arabidopsis |
| pFGC5941-35SR | TGTCCTCTCCAAATGAAATGAAC |
Fig. 3 Phylogenetic tree analysis of loquat(Ej)and apple(Md)bHLH proteins Outer branches of green,yellow and Roman numbers are shown the different bHLH subgroups. The bHLH proteins of loquat and apple are classified into 24 subfamilies. EjbHLH are distributed among 22 subgroups. Red arrow indicates the EjbHLH104
Fig. 4 Gene cloning of EjbHLH104 and structural characteristics of loquat EjbHLH104 protein A:FPKM values of flower bud differentiation in diploid and triploid cultivars,Changbai 1,late-flowering cultivar of diploid loquat,Wuhe Zaoyu,early-flowering cultivar of triploid loquats,Huayu Wuhe 1,late-flowering cultivar of triploid loquats;B:PCR amplification product of the EjbHLH104 gene from triploid loquat flower buds;C:Protein secondary structure of EjbHLH104,purple indicates random curls,blue indicates α helix,red indicates extended strand,green indicates β turn;D:Linear structure model of EjbHLH104 protein tertiary structure. E:Three-dimensional spatial structures of EjbHLH104
Fig. 6 Comparison of amino acid sequences between loquat EjbHLH104 and related members of other plants bHLH104 The underlined regions of EjbHLH104 were according to Carretero-Paulet et al.(2010)and Wu et al.(2022). basic:Basic domain;Helix 1:Helix 1 domain;Loop:Loop domain;Helix 2:Helix 2 domain. Ej:Eriobotrya japonica,Md:Malus × domestica,Pb:Pyrus bretschneideri,Ms:Malus sylvestris,Pa:Prunus avium,Pm:Prunus mume,Fv:Fragaria vesca,Rr:Rosa rugosa,Rc:Rosa chinensis
Fig. 8 Relative expression levels of EjbHLH104 in early(A,C)and late(B,D)flowering varieties on diploid and triploid loquat Significant differences are indicated by different lowercase letters(P < 0.05)
Fig. 9 Observation of flowering time phenotypes in EjbHLH104 transgenic Arabidopsis A:Screening of transgenic plants using herbicide;B:PCR verification of transgenic Arabidopsis(M indicates DNA marker,WT indicates wild-type Arabidopsis,1-23 indicates transgenic Arabidopsis lines,P indicates the PCR product with plasmid containing EjbHLH104 as a template);C:Flowering phenotypes;D:Flowering time analysis.** indicates significant difference in days of flowering at P < 0.01
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