龔曉平 張致力
摘要 [目的]鑒定水稻耐冷相關(guān)功能基因、解析其調(diào)控耐冷性的分子機(jī)制。[方法]以耐冷秈稻材料“P1211”和冷敏型秈稻突變體 cisc(ta) 為試驗(yàn)材料,進(jìn)行了低溫脅迫處理和水稻幼苗轉(zhuǎn)錄組測(cè)序分析。[結(jié)果]冷敏型突變體 cisc(ta) 低溫脅迫處理后共有4 542個(gè)差異表達(dá)基因,其中有3 673個(gè)基因上調(diào),869個(gè)基因下調(diào)。在冷敏突變體 cisc(ta) 的差異表達(dá)基因中篩選到一些與低溫脅迫相關(guān)的典型基因,如基本的螺旋-環(huán)-螺旋(bHLH)、活性氧清除(SOD1)和富亮氨酸重復(fù)序列(LRR)等調(diào)控基因,此外,還篩選出一些與生長(zhǎng)素、脫落酸(ABA)、赤霉酸(GA)和冷應(yīng)激反應(yīng)調(diào)控(DREB/CBF)等相關(guān)的基因。為了確認(rèn)RNA-seq數(shù)據(jù),隨機(jī)選擇差異表達(dá)基因進(jìn)行實(shí)時(shí)熒光定量 PCR(qRT-PCR)表達(dá)分析,結(jié)果與這些基因的RNA-seq表達(dá)測(cè)定一致,證實(shí)了RNA-seq 數(shù)據(jù)的準(zhǔn)確性。[結(jié)論]該研究為水稻耐冷機(jī)理的研究和篩選水稻遺傳改良有用的候選基因奠定基礎(chǔ)。
關(guān)鍵詞 水稻( ?sativa ?L.);低溫脅迫;耐冷性;表達(dá)分析
中圖分類號(hào) Q 943.2? 文獻(xiàn)標(biāo)識(shí)碼 A
文章編號(hào) 0517-6611(2021)19-0090-05
doi:10.3969/j.issn.0517-6611.2021.19.022
開放科學(xué)(資源服務(wù))標(biāo)識(shí)碼(OSID):
Analysis of miRNA Expression Profiles of a Cold-induced Seedling Chlorosis Gene( cisc(ta) ) in Rice under Cold Stress
GONG Xiao-ping, ZHANG Zhi-li
(Yudongnan Academy of Agricultural Sciences,Chongqing 408000)
Abstract [Objective]To identify genes for cold tolerance and understand its underlying molecular mechanism of its regulation of cold tolerance.[Method]In the present study,a cold tolerance variety‘P1211and a cold sensitive variety ‘ cisc(ta) were used for transcriptomics analysis under low temperature stress.[Result]The results showed that in response to cold,a total of 4 542 differentially expressed genes (DEGs) were detected in ?cisc(ta) ,including 3 673 up-regulated and 869 down-regulated genes.Many common and special DEGs were analyzed in ?cisc(ta) .Some typical genes related to cold stress such as the basic helix-loop-helix (bHLH) gene,superoxide dismutase(SOD1)and leucine-rich repeat (LRR) domain gene etc.In addition,some genes related to several plant hormones such as auxin,abscisic acid (ABA),gibberellic acid (GA) and dehydration responsive element binding protein/C-repeat binding factor (DREB/CBF) were identified.To confirm the RNA-seq data,qRT-PCR were performed on 7 randomly selected DEGs.The expression patterns of RNA-seq on these genes corresponded with the qRT-PCR method,which further confirmed the accuracy of RNA-seq results.[Conclusion]This study provides some insights into the cold tolerance mechanism and digging out useful candidate genes for genetic improvement in rice.
Key words Rice;Low temperature stress;Cold tolerance;Expression analysis
基金項(xiàng)目 重慶市基礎(chǔ)研究與前沿探索項(xiàng)目(cstc2018jcyjAX0447)。
作者簡(jiǎn)介 龔曉平(1980—),男,重慶人,副研究員,博士,從事水稻遺傳育種、分子生物學(xué)研究。*通信作者,研究員,從事水稻遺傳育種研究。
收稿日期 2021-02-13
鑒定水稻耐冷性新的基因,揭示水稻耐冷性可能的分子機(jī)制,開展耐冷性新種質(zhì)創(chuàng)制和新品種選育是解決水稻低溫冷害的根本途徑。水稻在長(zhǎng)期的自然進(jìn)化和人工馴化過(guò)程中形成了復(fù)雜而高效應(yīng)對(duì)低溫脅迫的內(nèi)部調(diào)控機(jī)制,以抵御和適應(yīng)低溫脅迫[1]。近年來(lái),隨著高通量測(cè)序技術(shù)的迅速發(fā)展,全基因組表達(dá)分析已被廣泛應(yīng)用于水稻耐逆功能基因組學(xué)研究,為植物耐逆相關(guān)基因鑒定和分子機(jī)制研究提供詳實(shí)、深度的數(shù)據(jù)[2]。Wang等[3]通過(guò)對(duì)耐寒水稻的轉(zhuǎn)錄組分析,鑒定了121個(gè)冷脅迫處理誘導(dǎo)的基因,發(fā)現(xiàn)活性氧(ROS)-bZIP1調(diào)節(jié)因子在冷脅迫的早期反應(yīng)中發(fā)揮重要作用。Zhang等[4]通過(guò)對(duì)耐寒水稻LTH和冷敏感水稻IR29轉(zhuǎn)錄組的比較,發(fā)現(xiàn)耐寒基因型中許多抗逆基因的表達(dá)均在冷處理后上調(diào)。進(jìn)一步分析表明,C-repeat binding factor (CBF)和MYBS3調(diào)節(jié)因子與水稻對(duì)冷脅迫的耐受性相關(guān)。Yang等[5]對(duì)耐寒水稻TNG67和耐寒水稻TCN1的低溫響應(yīng)進(jìn)行了轉(zhuǎn)錄組比較分析。耐寒基因型比冷敏感基因型具有更快速的抗寒基因表達(dá)變化,這與蛋白質(zhì)的代謝、修飾、折疊和防御反應(yīng)有關(guān)。TNG67的轉(zhuǎn)錄因子OsMyb、OsbHLH、OsIAA23、SNAC2和OsWRKY1v2可能是水稻耐冷相關(guān)基因的良好候選基因。通過(guò)對(duì)一個(gè)特定耐寒水稻品種的比較芯片數(shù)據(jù)分析,揭示了CBF和ABA響應(yīng)元件(ABRE)調(diào)控因子之間的復(fù)雜交叉,以及脫落酸(ABA)信號(hào)在水稻耐寒性中的作用[6]。Shen等[7]利用RNA序列分析技術(shù),在冷脅迫下比較了2個(gè)耐寒野生稻品種,結(jié)果表明共有318個(gè)差異表達(dá)基因是與耐寒性相關(guān)的常見差異表達(dá)基因。進(jìn)一步研究表明,鈣信號(hào)轉(zhuǎn)導(dǎo)可能在水稻的冷脅迫響應(yīng)中起主導(dǎo)作用,RNA解旋酶可能直接參與冷脅迫下水稻的溫度感知。