Page 69 - 《广西植物》2025年第7期
P. 69
7 期 陈宇姝等: 低温胁迫下外源油菜素内酯对冬小麦 REVEILLE 7 ̄like 基因表达的影响 1 2 6 1
( 1. College of Life Sciences and Agriculture and Forestryꎬ Qiqihar Universityꎬ Qiqihar 161006ꎬ Heilongjiangꎬ Chinaꎻ 2. Heilongjiang
Provincial Collaborative Innovation Center of Agrobiological Preparation Industrializationꎬ Qiqihar 161006ꎬ Heilongjiangꎬ China )
Abstract: ‘Dongnong Dongmai No.1’ (‘Dn1’) is the first hardy cold ̄resistant variety that can be planted in a large
area in the frigid regionsꎬ and the regreening rate is over 85%. To explore the function of REVEILLE 7 ̄like gene in
winter wheat and effect of exogenous brassinolide (BR) on the expression of this gene under low temperature stress. In
this studyꎬ the cDNA sequence of REVEILLE 7 ̄like gene of winter wheat (Dn1) was cloned by RT ̄PCRꎬ and its
bioinformatics analysis was carried out. At the three ̄leaf stage of winter wheatꎬ BR was sprayed on the leavesꎬ and leaves
and tillering nodes of winter wheat were sampled at 4ꎬ 0ꎬ -10ꎬ -25 ℃. The expression patterns of this gene in the
leaves and tillers of winter wheat in the above different treatment groups were analyzed by qRT ̄PCR. The results were as
follows: ( 1 ) REVEILLES belonged to MYB transcription factor familyꎬ and the full length of REVEILLE 7 ̄like gene
was 1 251 bpꎬ which encoded 416 amino acids. The encoded protein was an unstable hydrophilic proteinꎬ mainly located
in the nucleus. ( 2 ) REVEILLE 7 ̄like had the closest genetic relationship with Aegilops tauschii and emmer wheatꎬ
showing 78.62% sequence identity. ( 3 ) REVEILLE 7 ̄like gene promoter contained cis ̄acting elements involved in
adversity responseꎬ hormone response and MYB binding site. ( 4 ) The expression pattern analysis showed that the
expression level of REVEILLE 7 ̄like gene in the control group was significantly higher at 0ꎬ -10ꎬ -25 ℃ than at 4 ℃ꎬ
suggesting that the gene might play an important role in winter wheat under low temperature stress. At -10 ℃ and -25
℃ꎬ the expression level of the gene both in leaves and tillering nodes of winter wheat treated with BR was significantly
higher than that in the control group. In summaryꎬ these results suggest that the REVEILLE 7 ̄like gene plays an
important role in the response of winter wheat to low temperature stress. Exogenous BR application enhances the
expression of this geneꎬ particularly in tillering nodes and at lower temperatures ( - 10 ℃ and - 25 ℃)ꎬ where its
expression level is significantly higher than in leaves. This BR ̄induced upregulation of REVEILLE 7 ̄like expression
further improves the cold tolerance of winter wheatꎬ with a more pronounced effect observed in tillering nodes as
temperatures decrease..
Key words: winter wheat in cold zoneꎬ brassinosteroidsꎬ REVEILLE 7 ̄likeꎬ gene cloningꎬ low temperature stress
小麦是世界上重要的粮食作物之一ꎬ长时间 最大的转录因子家族之一ꎬ其成员在植物的生长
处于 0 ℃ 以下的生长环境ꎬ或在冬眠至春季发芽 发育、次生物质代谢、生物和非生物胁迫应答等多
之间的温度变化容易造成冻害( 金善宝ꎬ1996)ꎮ 种生理过程中发挥重要作用( 位欣欣和兰海燕ꎬ
低温胁迫下ꎬ植物叶片通常表现为萎蔫、变黄甚至 2022)ꎮ Paz ̄Ares 等(1987) 首次从单子叶植物玉
死亡ꎬ并且严重影响植物的正常生长发育(Shilpi & 米中克隆出与黄酮类色素合成有关的 ZmMYBC1
Narendraꎬ 2005)ꎮ 植物的呼吸作用和光合作用也 基因ꎬ通常在植物中 MYB 的 N 端含有一段 51 ~ 52
会受到低温胁迫的干扰ꎬ对水分和矿物质的吸收 个氨基酸的保守肽段ꎬ把这段保守序列称为 MYB
减少ꎬ植物细胞膜完整性遭到破坏ꎬ从而导致细胞 结构域(刘守梅等ꎬ2012)ꎮ 根据含有 MYB 结构域
的区室化丧失(Krol et al.ꎬ 2015)ꎮ 的数量将其分为 4 类ꎬ包含 1 个 MYB 结构域的
植物对低温胁迫的响应是一种积极主动的应 1R ̄MYB 家族ꎬ以及在 MYB 结构域中包含 2 个保
激过程ꎬ低温会诱导相关基因的表达ꎬ通过积累小 守的 R2 和 R3 重复序列的 R2R3 ̄MYB 家族、包含
分子抗性物质及抗氧化系统的活化等来缓解低温 3 个 MYB 结构域的 R1R2R3 ̄MYB 型和包含 4 个
胁迫造成的伤害ꎬ从而提高植物的抗性( 郭子武 MYB 结构域的 4R ̄MYB 型( Katiya et al.ꎬ 2012)ꎮ
等ꎬ2004)ꎮ 转录因子通过结合基因启动子上的顺 前人研究发现ꎬAtMYBC1 能够负调节 CBF 非依赖
式作用元件激活低温响应基因的表达ꎬ以提高植 途径 中 拟 南 芥 的 耐 冷 性 ( Zhai et al.ꎬ 2010 )ꎬ
物的耐低温性ꎻ与植物低温胁迫有关的转录因子 OsMYB2 过表达植株比野生型植株更耐盐、耐冷和
家族 包 括 AP2 / ERF、 NAC、 WRKY、 MYB、 bZIP 等 耐干旱胁迫ꎬ与胁迫相关的基因( 包括 OsLEA16、
(肖玉洁等ꎬ2018)ꎮ 其中ꎬMYB 是真核生物体内 OsRab2A 和 OsDREB2A) 上 调 更 大 ( Yang et al.ꎬ

