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学者姓名：刘楠楠
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Abstract ：
Plant phenotypic plasticity describes altered phenotypic performance of an individual when grown in different environments. Exploring genetic architecture underlying plant plasticity variation may help mitigate the detrimental effects of a rapidly changing climate on agriculture, but little research has been done in this area to date. In the present study, we established a population of 976 maize F-1 hybrids by crossing 488 diverse inbred lines with two elite testers. Genome-wide association study identified hundreds of quantitative trait loci associated with phenotypic plasticity variation across diverse F-1 hybrids, the majority of which contributed very little variance, in accordance with the polygenic nature of these traits. We identified several quantitative trait locus regions that may have been selected during the tropical-temperate adaptation process. We also observed heterosis in terms of phenotypic plasticity, in addition to the traditional genetic value differences measured between hybrid and inbred lines, and the pattern of which was affected by genetic background. Our results demonstrate a landscape of phenotypic plasticity in maize, which will aid in the understanding of its genetic architecture, its contribution to adaptation and heterosis, and how it may be exploited for future maize breeding in a rapidly changing environment.
Keyword ：
adaptation adaptation genetic architecture genetic architecture genotype-environment interaction genotype-environment interaction heterosis heterosis maize maize phenotypic plasticity phenotypic plasticity
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| GB/T 7714 | Liu, Nannan , Du, Yuanhao , Warburton, Marilyn L. et al. Phenotypic Plasticity Contributes to Maize Adaptation and Heterosis [J]. | MOLECULAR BIOLOGY AND EVOLUTION , 2021 , 38 (4) : 1262-1275 . |
| MLA | Liu, Nannan et al. "Phenotypic Plasticity Contributes to Maize Adaptation and Heterosis" . | MOLECULAR BIOLOGY AND EVOLUTION 38 . 4 (2021) : 1262-1275 . |
| APA | Liu, Nannan , Du, Yuanhao , Warburton, Marilyn L. , Xiao, Yingjie , Yan, Jianbing . Phenotypic Plasticity Contributes to Maize Adaptation and Heterosis . | MOLECULAR BIOLOGY AND EVOLUTION , 2021 , 38 (4) , 1262-1275 . |
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Abstract ：
【目的】叶绿素含量与作物产量呈正相关。通过提高叶绿素含量来提高作物产量是作物育种的方向之一。因此,利用全基因组关联分析(genome-wide association study, GWAS)解析玉米叶绿素含量的遗传基础,可为玉米高光效理想株型设计育种提供理论指导。【方法】以538份玉米自交系构成的关联群体为研究对象,在5个环境下,通过对其授粉后5 d的棒三叶(穗位叶、穗上叶、穗下叶)叶绿素含量进行测定,并借助覆盖玉米全基因组的558 629个单核苷酸多态性标记(SNPs),利用3种模型(Q、K和Q+K)对叶绿素含量进行全基因组关联分析,随后选择最优模型的GWAS结果并结合eQTL(expression quantitative trait loci)分析对叶绿素含量的自然变异进行解析。【结果】5个环境下,棒三叶叶绿素含量均遵从正态分布且叶绿素含量间呈正相关;方差分析表明棒三叶叶绿素含量的环境效应、基因型效应、基因型与环境互作效应均达到了极显著水平;此外,穗上叶、穗位叶和穗下叶叶绿素含量的遗传力分别为0.66、0.66和0.67。比较3种模型发现K模型对假阳性(I型错误)控制最好,在此模型下共检测到29个与棒三叶叶绿素含量显著关联的SNP(P≤3.99×10-6),涉及到18个位点,共有76个候选基因落在这18个位点内,其中85.5%(65/76)的候选基因具有eQTL,11.8%(9/76)的候选基因与对应表型显著相关(P<0.05),说明这9个基因可能是通过表达量变化来调控表型变异。在这76个基因中,60个候选基因有功能注释,功能涉及到能量代谢、物质输送代谢途径和生物合成调节等过程。此外还发现2个可以在不同环境或不同叶片共定位的位点,其中,共定位位点内的基因GRMZM2G074759编码一种与AAE3高度相似的酰基活化酶,该基因通过提高α-酮戊二酸(ALA)和草酰乙酸含量进而影响氨基酸生物合成,提高籽粒赖氨酸含量,改善玉米品质。此外,ALA的合成会促使叶绿素含量升高,进而提高作物产量,推测该基因为最可能的候选基因。【结论】K模型对假阳性的控制效果最好,基于K模型,共检测到18个玉米叶绿素含量显著关联位点,发现多个参与叶绿素合成途径相关基因。
Keyword ：
全基因组关联分析 全基因组关联分析 叶绿素含量 叶绿素含量 玉米 玉米 高光合效率 高光合效率
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| GB/T 7714 | 史大坤 , 姚天茏 , 刘楠楠 et al. 玉米叶绿素含量的全基因组关联分析 [J]. | 中国农业科学 , 2019 , 52 (11) : 1839-1857 . |
| MLA | 史大坤 et al. "玉米叶绿素含量的全基因组关联分析" . | 中国农业科学 52 . 11 (2019) : 1839-1857 . |
| APA | 史大坤 , 姚天茏 , 刘楠楠 , 邓敏 , 段海洋 , 王路林 et al. 玉米叶绿素含量的全基因组关联分析 . | 中国农业科学 , 2019 , 52 (11) , 1839-1857 . |
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