关键词:β; 淀粉酶; 茶树; 基因克隆; 低温胁迫; 表达调控 Cloning of β-amylase Gene ( CsBAM3) and Its Expression Model Response to Cold Stress in Tea Plant HAO Xin-Yuan1,**, YUE Chuan1,2,**, TANG Hu1, QIAN Wen-Jun1, WANG Yu-Chun1, WANG Lu1, WANG Xin-Chao1,*, YANG Ya-Jun1,* 1 Tea Research Institute, Chinese Academy of Agricultural Sciences / National Center for Tea Improvement / Key Laboratory of Tea Plant Biology and Resources Utilization, Ministry of Agriculture, Hangzhou 310008, China
2 College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002
Fund:This study was supported by the Natural Science Foundation of Zhejiang Province (LY16C160001), the China Agriculture Research System (CARS-19), and the Chinese Academy of Agricultural Sciences through an Innovation Project for Agricultural Sciences and Technology (CAAS-ASTIP-2017-TRICAAS). AbstractA major enzyme of starch breakdown in plant leaf, β-amylase (BAM), plays important roles in response to abiotic stresses. In tea plant, a differentially expressed gene involved in starch metabolism was identified from previous RNA-Seq analysis of cold acclimation. Its full-length cDNA was cloned and sequenced, showing that it is a homolog of BAM3 in Arabidopsis (named CsBAM3). CsBAM3 contains 548 amino acid residues and is grouped into subfamily II together with BAM1 and BAM3 from Arabidopsis. According to protein sequence and 3D structure analyses, CsBAM3 was considered as a chloroplast-targeted protein with β-amylase activity. Promoter cloning and sequence analysis showed a couple of responsive elements related to circadian, light, cold, and phytohormone, indicating its complex regulating mechanism. CsBAM3 showed the expression higher in leaf, relative lower in stem and flower and extremely low in root. The expression of CsBAM3 in mature leaf was significantly up-regulated during the early time courses of winter cold acclimation and maintained at relative high level during the following period. With the treatments of 4°C and 0°C, the transcript levels of CsBAM3 in both mature leaves and young shoots were dramatically increased, interestingly, much higher level was detected in young shoots. The cold environment similar to spring cold spell was created using climate chamber. And the expression changes of CsBAM3 in shoots were determined then after the tea plants were moved into climatic chamber at different sprouting phrases. CsBAM3 was quickly up-regulated by cold once the first leaf unfolded. Our study illuminated that CsBAM3 is a key β-amylase coding gene involved in starch metabolism of tea plant, which can be stimulated in both mature leaves and young shoots by cold stress.
Keyword:β; -amylase; Tea plant; Gene clone; Cold stress; Expression regulation Show Figures Show Figures
图2 CsBAM3与其他物种中BAMs的系统发育树分析 BAMs被聚为I、II、III、IV亚家族。CsBAM3用红色字体及蓝色实心圆标出, 拟南芥中BAMs用绿色实心方块儿标出。Fig. 2 Phylogeny of CsBAM3 and BAMs from other species Plant BAM proteins fall into four subfamilies (I, II, III, IV). Red and blue filled circle mean CaBAM3; green solid squares for BAMs from Arabidopsis.
图3 CsBAM3的3D结构预测 与底物结合的作用位点用红色表示, 蓝色圆球为具有催化功能的Glu186和Glu380残基。Fig. 3 3D structure prediction of CsBAM3 Red sticks indicate substrate binding residues. Blue dots indicate the catalytic residues of Glu186 and Glu380.
图4CsBAM3启动子序列及包含的顺式作用元件Fig. 4 Sequence andcis-acting element information of CsBAM3 promoter
表2 Table 2 表2(Table 2)
表2CsBAM3启动子区顺式作用元件功能注释 Table 2 Functional annotation of the cis-acting elements in CsBAM3 promoter region
序列 Sequence
位点名称 Site name
功能 Function
CAANNNNATC
Circadian
cis-acting regulatory element involved in circadian control
TGACG
TGACG-motif
cis-acting regulatory element involved in the MeJA-responsiveness
CAGAAAAGGA, CCATCTTTTT
TCA-element
cis-acting element involved in salicylic acid responsiveness
TATATATATATATATATATATA
TA-rich region
Enhancer
AAAAAATTTC, AGAAAATTCG
HSE
cis-acting element involved in heat stress responsiveness
ATTTCAAA
ERE
Ethylene-responsive element
TTTCAAA
Box I
Light responsive element
ATTAATTTTACA
AT1-motif
Part of a light responsive module
ATTAAT
Box 4
Part of a conserved DNA module involved in light responsiveness
AGAAACAA
AE-box
Part of a module for light response
CC(G/A)CCC
Sp1
Light responsive element
CCTTTTG
P-box
Gibberellin-responsive element
CACGTG, ACGTGGC
ABRE
cis-acting element involved in the abscisic acid responsiveness
TAACACA
Amylase box
Conserved sequence found in 5'-upstream region of alpha-amylase gene of rice, wheat, and barley
CANNTG
MYCCONSENSUSAT
MYC recognition site found in the promoters of the dehydration- responsive gene rd22 and many other genes in Arabidopsis; MYC recognition sequence in CBF3 promoter; Binding site of ICE1 (inducer of CBF expression 1) that regulates the transcription of CBF/DREB1 genes in the cold in Arabidopsis
表2CsBAM3启动子区顺式作用元件功能注释 Table 2 Functional annotation of the cis-acting elements in CsBAM3 promoter region
图6 温度变化及CsBAM3在冷驯化阶段的表达模式分析 A: 采样期间10月至第2年3月份每日温度变化, 其中虚线间为11月和12月份冷驯化阶段温度变化。 B: 冷驯化阶段CsBAM3基因的表达变化。Fig. 6 Temperature information and expression level of CsBAM3 during cold acclimation periods A: daily temperature from October to the next March, in which the temperature during cold acclimation (November and December) was marked between dotted lines. B: expression changes of CsBAM3 during cold acclimation.
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