小麦蔗糖合酶基因TaSUS2调控籽粒淀粉合成及品质的功能研究

doi:10.3724/SP.J.1006.2025.41076

作物学报 ›› 2025, Vol. 51 ›› Issue (6): 1514-1525.doi: 10.3724/SP.J.1006.2025.41076

• 作物遗传育种·种质资源·分子遗传学 • 上一篇下一篇

小麦蔗糖合酶基因TaSUS2调控籽粒淀粉合成及品质的功能研究

吴美娟¹^,²(), 张寅辉², 李元昊², 刘海霞², 黄以琳², 李甜², 刘红霞², 张学勇², 郝晨阳¹^,²^,^*(), 郭杰¹^,^*(), 侯健²^,^*()

¹山西农业大学农学院/农业农村部有机旱作农业重点实验室(部省共建), 山西晋中 030801
²中国农业科学院作物科学研究所/作物基因资源与育种全国重点实验室/农作物基因资源与基因改良国家重大科学工程, 北京 100081

收稿日期:2024-11-10 接受日期:2025-03-26 出版日期:2025-06-12 网络出版日期:2025-03-31
通讯作者: ^*郝晨阳, E-mail: haochenyang@caas.cn;郭杰, E-mail: nxgj1115326@sxau.edu.cn;侯健, E-mail: houjian@caas.cn
作者简介:E-mail: 18827115116@163.com
基金资助:
本研究由国家重点研发计划项目(2023YFD1200404)

Functional dissection of sucrose synthase gene TaSUS2 regulating grain starch synthesis and quality in wheat

WU Mei-Juan¹^,²(), ZHANG Yin-Hui², LI Yuan-Hao², LIU Hai-Xia², HUANG Yi-Lin², LI Tian², LIU Hong-Xia², ZHANG Xue-Yong², HAO Chen-Yang¹^,²^,^*(), GUO Jie¹^,^*(), HOU Jian²^,^*()

¹College of Agronomy, Shanxi Agricultural University / Key Laboratory of Sustainable Dryland Agriculture (Co-construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Jinzhong 030801, Shanxi, China
²Institute of Crop Sciences, Chinese Academy of Agricultural Sciences / State Key Laboratory of Crop Gene Resources and Breeding / National Key Facility for Crop Gene Resources and Genetic Improvement, Beijing 100081, China

Received:2024-11-10 Accepted:2025-03-26 Published:2025-06-12 Published online:2025-03-31
Contact: ^*E-mail: haochenyang@caas.cn;E-mail: nxgj1115326@sxau.edu.cn;E-mail: houjian@caas.cn
Supported by:
the National Key Research and Development Program of China(2023YFD1200404)

摘要/Abstract

摘要：

小麦是重要的粮食作物之一, 持续提升其产量是育种的重要目标。提高粒重可以有效提高小麦单产, 而小麦籽粒的主要成分是淀粉。为全面解析淀粉合成通路关键酶基因TaSUS2对籽粒淀粉合成的作用, 本研究从小麦基因组中扩增了TaSUS2的全长cDNA序列, 并在科农199中对TaSUS2进行基因编辑, 获得2种纯合二突材料(KO-1、KO-2)和1种纯合的三突材料(KO-3)。转基因材料表型鉴定发现, 与野生型相比, TaSUS2的种子出现明显的皱缩, 粒重显著下降, 且籽粒胚乳中总淀粉含量、直链淀粉含量、绝对淀粉含量和A型淀粉的粒径也显著降低, 表明TaSUS2影响粒重和籽粒中的淀粉合成。转录组分析发现, TaSUS2-KO-3花后21 d的籽粒中淀粉合成通路上的多个主要合成酶基因上调表达。开发TaSUS2-2A-CAPS标记并鉴定了145份重测序材料, 发现TaSUS2影响淀粉含量、湿面筋含量、蛋白质含量及沉降值等品质性状, TaSUS2-2A-Hap-G是影响品质性状的优异单倍型。研究结果为阐析TaSUS2的生物学功能奠定了基础, 也为未来小麦的高产优质分子育种提供了基因资源。

关键词: 小麦, TaSUS2, 粒重, 淀粉含量, 品质

Abstract:

Wheat is one of the world’s most important cereal crops, and improving yield remains a key goal in wheat breeding. Grain weight is a major determinant of yield, and starch is the primary component of wheat grains. To investigate the function of TaSUS2, a key enzyme gene in the starch synthesis pathway, we amplified its full-length cDNA sequence from the wheat genome and performed gene editing in the cultivar Kenong 199 (KN199). This resulted in the generation of two homozygous diploid mutants (KO-1 and KO-2) and one homozygous triploid mutant (KO-3). Phenotypic analysis of the transgenic lines revealed that TaSUS2 mutant grains exhibited pronounced wrinkling and a significant reduction in grain weight compared to the wild type. Additionally, the total starch content, amylose content, absolute starch content, and the diameter of A-type starch granules in the endosperm were significantly reduced in TaSUS2 mutant grains. These findings confirm that TaSUS2 plays a crucial role in starch synthesis and grain weight determination. Transcriptome analysis indicated that multiple enzyme-encoding genes involved in starch biosynthesis were upregulated in TaSUS2-KO-3 grains at 21 days post-anthesis (DPA). Furthermore, genotyping of a natural population of 145 wheat accessions using the TaSUS2-2A-CAPS marker revealed that TaSUS2 was significantly associated with starch content, wet gluten content, protein content, and sedimentation value. Notably, the TaSUS2-2A-Hap-G haplotype was identified as a favorable allele for these quality traits. Overall, this study provides valuable insights into the biological function of TaSUS2 and offers novel genetic resources for molecular breeding aimed at improving wheat yield and quality.

Key words: wheat, TaSUS2, grain weight, starch content, quality

吴美娟, 张寅辉, 李元昊, 刘海霞, 黄以琳, 李甜, 刘红霞, 张学勇, 郝晨阳, 郭杰, 侯健. 小麦蔗糖合酶基因TaSUS2调控籽粒淀粉合成及品质的功能研究[J]. 作物学报, 2025, 51(6): 1514-1525.

WU Mei-Juan, ZHANG Yin-Hui, LI Yuan-Hao, LIU Hai-Xia, HUANG Yi-Lin, LI Tian, LIU Hong-Xia, ZHANG Xue-Yong, HAO Chen-Yang, GUO Jie, HOU Jian. Functional dissection of sucrose synthase gene TaSUS2 regulating grain starch synthesis and quality in wheat[J]. Acta Agronomica Sinica, 2025, 51(6): 1514-1525.

图/表 7

表1

图1

图2

图3

表2

TaSUS2-KO-3花后21 d籽粒中生长素信号通路基因差异表达分析"

生长素信号通路基因ID Auxin signalling pathway gene ID	生长素信号通路基因注释 Gene annotation of auxin signaling pathway	差异倍数 Difference multiple
TraesCS2D02G322600	ABC transporter B family member 19	0.39
TraesCS2A02G344300	ABC transporter B family member 19	0.32
TraesCS2B02G341800	ABC transporter B family member 19	0.24
TraesCS2D02G548900	Auxin response factor 12	0.37
TraesCS2A02G547800	Auxin response factor 12	0.46
TraesCS2B02G578500	Auxin response factor 12	0.34
TraesCS7A02G252000	Auxin response factor 21	0.45
TraesCS7B02G138900	Auxin response factor 21	0.43
TraesCS7D02G250100	Auxin response factor 21	0.46
TraesCS5D02G045700	Auxin response factor 25	0.36
TraesCS5B02G039800	Auxin response factor 25	0.37
TraesCS5A02G038300	Auxin response factor 25	0.42
TraesCS6A02G138600	Auxin response factor 6	0.38
TraesCS6D02G127600	Auxin response factor 6	0.35
TraesCS6B02G167100	Auxin response factor 6	0.24
TraesCS1A02G077800	Auxin transporter-like protein 3	0.28
TraesCS1D02G079900	Auxin transporter-like protein 3	0.33
TraesCS1B02G095900	Auxin transporter-like protein 3	0.31
TraesCS5B02G104100	Auxin-binding protein 1	0.39
TraesCS5A02G098900	Auxin-binding protein 1	0.41
TraesCS3B02G181500	Auxin-responsive protein IAA17	0.44
TraesCS7A02G331100	Auxin-responsive protein IAA21	0.47
TraesCS3A02G155200	Auxin-responsive protein IAA3	0.48
TraesCS5D02G069300	Auxin-responsive protein IAA30	0.35
TraesCS5B02G058500	Auxin-responsive protein IAA30	0.31
TraesCS5A02G058600	Auxin-responsive protein IAA30	0.40
TraesCS7A02G384600	Auxin-responsive protein SAUR32	0.47
TraesCS1A02G178700	Auxin-responsive protein SAUR32	0.43
TraesCS6A02G141200	Auxin-responsive protein SAUR71	0.15
TraesCS6B02G169500	Auxin-responsive protein SAUR71	0.43
TraesCS4B02G016500	Auxin-responsive protein SAUR71	0.31
TraesCS7D02G191600	Probable auxin efflux carrier component lc	0.33
TraesCS7A02G190600	Probable auxin efflux carrier component lc	0.37

表2

表3

图4

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引物用途 Primer use	引物名称 Primer name	引物序列 Primer sequence (5′-3′)
基因扩增 Gene amplification	SUS2-2A-F	ATGAACAAACGCGGCT
	SUS2-2A-R	TCATTTGCCCGAGGTC
	SUS2-2B-F	ATGATCTGCTTCCCAAAGCA
	SUS2-2B-R	TCATTTGCCCGAGGTC
CAPS标记 CAPS marker	SUS2-2A-M1F	GCAATAGTTCCGTGCTCCTGTG
	SUS2-2A-M1R	AGAAATACGCAAGGCAACCAT
	SUS2-2A-M2F	CACGCCAACCTTTCTTCTTCC
	SUS2-2A-M2R	TCGCTTAACCGTGTCTCACA

淀粉合成相关酶基因 SSRG	差异倍数 Difference multiple	淀粉合成相关酶基因 SSRG	差异倍数 Difference multiple	淀粉合成相关酶基因 SSRG	差异倍数 Difference multiple
SUS2-2A	0.09	AGPL-1B	1.95	SSIIb-6D	0.90
SUS2-2B	0.14	AGPL-1D	2.10	SSIII-1A	1.89
SUS2-2D	0.17	AGPS1-7A	1.51	SSIII-1B	2.22^*
SUS1-7A	1.47	AGPS1-7B	2.98^*	SSIII-1D	1.76
SUS1-7B	1.25	AGPS1-7D	2.50^*	SBEI-7A	0.79
SUS1-7D	1.33	BT1-6A	2.35^*	SBEI-7B	1.06
UGP-5A	1.25	BT1-6B	2.03^*	SBEI-7D	0.92
UGP-5B	1.31	BT1-6D	2.73^*	SBEIIa-2A	2.11^*
UGP-5D	1.19	GBSSI-4A	1.52	SBEIIa-2B	1.90
FRK-7A	1.55	GBSSI-7A	1.98	SBEIIa-2D	1.72
FRK-7B	1.68	GBSSI-7D	1.65	SBEIIb-2A	2.13^*
FRK-7D	1.37	SSI-7A	1.60	SBEIIb-2B	2.18^*
PGI-1A	0.92	SSI-7B	1.48	SBEIIb-2D	2.57^*
PGI-1B	1.31	SSI-7D	1.79	ISA-7A	1.58
PGI-1D	1.28	SSIIa-7A	2.73^*	ISA-7B	1.66
PGM-4A	1.22	SSIIa-7B	2.02^*	ISA-7D	1.39
PGM-4B	1.33	SSIIa-7D	2.37^*	PUL-7A	1.01
PGM-4D	1.28	SSIIb-6A	0.75	PUL-7B	1.64
AGPL-1A	1.47	SSIIb-6B	0.62	PUL-7D	1.96

小麦蔗糖合酶基因TaSUS2调控籽粒淀粉合成及品质的功能研究

Functional dissection of sucrose synthase gene TaSUS2 regulating grain starch synthesis and quality in wheat

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