中国农业科学2024，Vol.57Issue(12)：2265-2281,17.DOI:10.3864/j.issn.0578-1752.2024.12.001
玉米苯丙氨酸解氨酶(PAL)家族基因分析及ZmPAL5的功能研究
Analysis of Maize Phenylalanine Ammonia-Lyase(PAL)Family Genes and Functional Study of ZmPAL5
摘要
Abstract
[Objective]Mining the key drought-resistant genes of maize,revealing its drought-resistant molecular mechanism,and providing genetic resources and theoretical guidance for the cultivation of new drought-resistant maize varieties.[Method]Transcriptome data combined with weighted gene co-expression network(WGCNA)and screening methods for physiological and biochemical indicators of drought resistance were used to identify ZmPAL genes associated with drought resistance and rewatering.Genome-wide analysis of the genes encoding PAL was performed using bioinformatics methods.Quantitative real-time fluorescence PCR(qRT-PCR)was used to detect the expression of ZmPAL genes under drought treatment conditions,as well as the expression characteristics of ZmPAL5 among different inbred lines and the expression patterns in different tissues.Finally,genetic transformation was used to analyze the drought resistance function of ZmPAL5 in maize,and the deletion-type Arabidopsis mutant was analyzed for drought resistance with the help of CRISPR/Cas9 technology for the PAL5 homologous gene.[Result]Nineteen maize ZmPAL genes were identified,six of which were clustered on chromosome 5 and encoded proteins that were mostly hydrophilic acidic proteins and relatively evolutionarily conserved in the PAL family of genes.The promoter region of ZmPAL genes contained a large number of cis-acting elements associated with hormonal and abiotic stress responses.Six core genes were identified,four of which were significantly up-regulated for expression after drought treatment.In particular,ZmPAL5 showed an 8.57-fold increase in expression after drought stress.The expression level of ZmPAL5 was found to be significantly higher in the drought-resistant inbred line Zheng 8713 than in the drought-sensitive inbred line B73 under both drought stress and rewatering treatments.Meanwhile,ZmPAL5,a constitutively expressed gene,showed a high level of expression in young stems.Overexpressed ZmPAL5 maize grew well under drought stress,and its relative water content,lignin,chlorophyll,soluble protein,proline content,and activities of superoxide dismutase,peroxidase,catalase,and ascorbate peroxidase were 1.52,1.49,1.47,1.43,1.44,1.41,1.53,1.41,and 1.35 times,but the malondialdehyde content was 0.65 times that of the wild type.The PAL5-deficient Arabidopsis mutant was sensitive to drought.Under drought stress,its physiological and biochemical indexes showed the opposite trend to those of overexpression of ZmPAL5 maize.[Conclusion]Six core genes(ZmPAL3,ZmPAL5,ZmPAL6,ZmPAL8,ZmPAL11,and ZmPAL13)were screened in response to drought stress,in which theexpression of ZmPAL5 was positively correlated with drought resistance.ZmPAL5 positively regulated the drought resistance and resilience of the plant by influencing the content of osmotically regulated substances and antioxidant enzyme activities.关键词
玉米/苯丙氨酸解氨酶/ZmPAL5/抗旱性/生理生化Key words
maize/phenylalanine ammonia-lyase/ZmPAL5/drought resistance/physiology and biochemistry引用本文复制引用
曹丽茹,叶飞宇,库丽霞,马晨晨,庞芸芸,梁小菡,张新,鲁晓民..玉米苯丙氨酸解氨酶(PAL)家族基因分析及ZmPAL5的功能研究[J].中国农业科学,2024,57(12):2265-2281,17.基金项目
河南省农业科学院杰出青年科技基金(2022JQ02)、神农种业实验室项目(SN01-2022-02)、国家自然科学基金青年基金(32201708)、河南省现代农业产业技术体系建设专项资金(HARS-02-G1) （2022JQ02）
