过表达<i>OsSAUR23</i>调控拟南芥对ABA及GA<sub>3</sub>的响应

doi:10.7668/hbnxb.20196230

摘要/Abstract

摘要：

SAUR基因在植物生长发育过程中起着重要的调控作用。植物激素ABA与GA₃在植物生长-胁迫应答中发挥关键作用。为了探究水稻OsSAUR23基因是否受ABA和GA₃调控。研究分析了OsSAUR23基因启动子区域的顺式作用元件,并以转OsSAUR23基因拟南芥和野生型拟南芥为试验材料,进行外源激素处理,通过测定其农艺性状、生理指标及与酸生长、ABA通路相关基因的表达情况,明确水稻OsSAUR23基因对ABA和GA₃响应的作用机制。结果表明:OsSAUR23基因的启动子区域含有ABA和GA₃的顺式作用元件,且水稻在ABA和GA₃处理下OsSAUR23基因的表达量显著增加。在农艺性状方面,随着ABA浓度的增加,过表达拟南芥发芽率、根长、株高和鲜质量均受到抑制,但株高和鲜质量均显著高于野生型。使用GA₃处理后,过表达拟南芥发芽率和根长呈现低浓度促进、高浓度抑制的双向调控模式,同时株高和鲜质量均显著高于野生型。在生理指标方面,随着ABA浓度的增加,过表达拟南芥SOD活性呈显著上升趋势,POD活性、CAT活性和MDA含量与野生型相比差异不显著,可溶性蛋白含量与野生型相比显著升高;随着GA₃浓度的增加,过表达拟南芥SOD活性、POD活性增加,CAT活性先升后降,MDA含量先降后升,可溶性蛋白含量与野生型相比显著升高。同时ABA和GA₃处理能促进过表达拟南芥根系等部位pH值下降,但高浓度激素处理会抑制该效应。qRT-PCR结果表明,过表达OsSAUR23显著下调了AtPP2C.D家族基因(AtAPD5、AtAPD6、AtAPD9)的表达,解除对质膜H⁺-ATP的抑制,促进质子外排,最终导致根系等部位pH值下降;同时过表达OsSAUR23导致AtPP2C.A成员表达呈现差异性变化,表明OsSAUR23可能参与协调ABA信号的传导。综上所述,OsSAUR23通过响应ABA和GA₃正向调控植株生长。

关键词: 水稻, OsSAUR23基因, 脱落酸, 赤霉素, 活性氧

Abstract:

SAUR genes play an important regulatory role in plant growth and development.The plant hormones ABA and GA₃ play key roles in the plant growth-stress response.To investigate whether the rice OsSAUR23 gene is regulated by ABA and GA₃,it analyzed the cis-regulatory elements in the promoter region of the OsSAUR23 gene.Using transgenic Arabidopsis lines expressing OsSAUR23 and wild-type Arabidopsis as experimental materials,the plants were treated with exogenous hormones.By measuring agronomic traits,physiological indicators,and the expression of genes related to acid growth and the ABA pathway,the study elucidated the mechanism by which the rice OsSAUR23 gene responds to ABA and GA₃.The results indicated that the promoter region of the OsSAUR23 gene contained cis-acting elements for ABA and GA₃,and that the expression of the OsSAUR23 gene in rice significantly increased under ABA and GA₃ treatment.Regarding agronomic traits,as ABA concentration increased,the germination rate,root length,plant height,and fresh weight of transgenic Arabidopsis were inhibited with increasing ABA concentrations,but plant height and fresh weight remained significantly higher than those of WT.GA₃ treatment induced a bidirectional regulatory pattern in transgenic Arabidopsis,low concentrations promoted germination rate and root length,while high concentrations suppressed them.Plant height and fresh weight of transgenic lines were consistently higher than WT under GA₃ treatment.Physiologically,SOD activity in transgenic Arabidopsis increased significantly with ABA concentration,while POD activity,CAT activity,and MDA content showed no significant difference compared to WT.Soluble protein content was significantly higher in transgenic lines.Under GA₃ treatment,SOD and POD activities increased,CAT activity initially rose and then declined,MDA content first decreased and then increased,and soluble protein content remained elevated compared to WT.Furthermore,both ABA and GA₃treatments promoted a decrease in pH in the roots and other tissues of the overexpression lines,although this effect was inhibited under high hormone concentrations.qRT-PCR results demonstrated that overexpression of OsSAUR23 significantly downregulated the expression of AtPP2C.D family genes (AtAPD5,AtAPD6,and AtAPD9),which lifted the inhibition of plasma membrane H⁺-ATPase activity,promoted proton efflux,and ultimately led to acidification in root zones and other regions.Meanwhile,overexpression of OsSAUR23 also caused differential changes in the expression of AtPP2C.A members,suggesting its potential role in modulating ABA signaling transduction.OsSAUR23 positively regulates plant growth in response to ABA and GA₃.

Key words: Rice, OsSAUR23 gene, Abscisic acid, Gibberellin, Reactive oxygen species

中图分类号:

管政, 张耀方, 王昊, 李志彬, 罗峰, 裴忠有. 过表达OsSAUR23调控拟南芥对ABA及GA₃的响应[J]. 华北农学报, 2026, 41(2): 74-82. doi: 10.7668/hbnxb.20196230.

GUAN Zheng, ZHANG Yaofang, WANG Hao, LI Zhibin, LUO Feng, PEI Zhongyou. Overexpression of the OsSAUR23 Regulates the Response of Arabidopsis thaliana to ABA and GA₃[J]. Acta Agriculturae Boreali-Sinica, 2026, 41(2): 74-82. doi: 10.7668/hbnxb.20196230.

http://www.hbnxb.net/CN/Y2026/V41/I2/74

图/表 8

表1 引物信息

Tab.1 Primers information

引物名称 Primer name	引物序列(5'—3') The sequences of primer (5'—3')
OsACTIN-F	AGGAAGGCTGGAAGAGGACC
OsACTIN-R	CGGGAAATTGTGAGGGACAT
OsSAUR23-F	ATGTGCAAGGTCATCACGATCCAG
OsSAUR23-R	TCACCAGACGAGGCTGTCCAT
AtAPD5-F	TCGTCCTCAAACACCCAAGA
AtAPD5-R	TGTCGTCGAATTCCTTTGGC
AtAPD6-F	GCTACAAGAAGCGGCAAAGA
AtAPD6-R	TAGATTCACACCCGCTCCTC
AtAPD9-F	CGTGCATGATCTCCAACCAG
AtAPD9-R	CTCCTCGCTATCCCGTTTCT
AtABI1-F	TACGACGTCGGTTTGTGGTA
AtABI1-R	ATCATGCAACCGTTCTCTGC
AtHAI1-F	GAGAGACGATGACTGCCTCA
AtHAI1-R	AGACACATACGCGCTACAGA
AtHAI3-F	GAGAGACGATGACTGCCTCA
AtHAI3-R	AGACACATACGCGCTACAGA

图1 OsSAUR23基因表达水平的qRT-PCR分析不同小写字母表示有显著差异(P<0.05)。图2—5,7同。

Fig.1 qRT-PCR analysis of the expression level of OsSAUR23 gene Different lowercase letters indicate significant differences,P<0.05.The same as Fig.2—5,7.

图2 不同浓度ABA和GA₃对拟南芥发芽率和根长的影响

Fig.2 Effects of different concentrations of ABA and GA₃ on germination and root length in Arabidopsis

图3 不同浓度ABA和GA₃对拟南芥株高和鲜质量的影响

Fig.3 Effects of different concentrations of ABA and GA₃ on the activities of plant height and fresh weight in Arabidopsis

图4 不同浓度ABA和GA₃对拟南芥SOD、POD及CAT活性的影响

Fig.4 Effects of different concentrations of ABA and GA₃ on the activities of SOD,POD and CAT in Arabidopsis

图5 不同浓度ABA和GA₃对拟南芥MDA和可溶性蛋白含量的影响

Fig.5 Effects of different concentrations of ABA and GA₃ on MDA and soluble protein in Arabidopsis

图6 过表达OsSAUR23拟南芥响应外源激素加速培养基酸化培养基变黄表示pH值下降。

Fig.6 Trans-OsSAUR23 gene Arabidopsis responds to exogenous hormones to accelerate medium acidification Yellowing of the medium indicates a decrease in pH value.

图7 过表达OsSAUR23对AtPP2C基因表达的影响

Fig.7 Effects of OsSAUR23 overexpression on the expression of AtPP2C genes

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过表达OsSAUR23调控拟南芥对ABA及GA3的响应

Overexpression of the OsSAUR23 Regulates the Response of Arabidopsis thaliana to ABA and GA3

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过表达OsSAUR23调控拟南芥对ABA及GA₃的响应

Overexpression of the OsSAUR23 Regulates the Response of Arabidopsis thaliana to ABA and GA₃