Grassland Research | 多环境和施肥水平下柳枝稷草地建植过程中选择效应一致
Grassland Research草业科学领域国际学术期刊
导读
多年生草地通常以种子形式进行建植,且通常为异化授粉植物,导致子代变异较大。研究表明,在多年生草地建植的当季,植株死亡率从50%到90%不等,环境因素以及农艺管理措施对基因型的选择影响尚不明确。
美国威斯康星大学的研究人员Neal W. Tilhou和Michael D. Casler以低地型和杂交型柳枝稷为研究材料,在3个研究地点以及不同施肥水平下对此问题开展了系统研究。通过采集建植当季植株及建植3年的植株叶片进行DNA测序,利用多变量方差分析、全基因组性状预测和基因组估计育种值对个体等位基因频率进行分析。结果表明,在草地建植初期到草地稳定过程的自然选择过程中,仅有少量变异与建植地点和管理水平有关,在不同的环境和管理水平上自然选择维持相对一致。
原文图表
Figure 1.Predicted change in genomically estimated breedingvalues for winter survivorship and the heading date due to sward survival selection. The heading date is measured as the predicted change in the ordinal day of the year when 50% of tillers have exposed panicles. Winter survivorship scores are based on a spring visual ranging from 0 (completely deceased) to 20 (no visible damage). Colorsrepresent nitrogen fertilization (no fertilization and 112 kg N ha−1). The locations are Prairie du Sac, WI (PDS), and Hancock, WI (HAN). G1 and G2 are sequential breeding populations from and hybrid ecotype ancestry.
Figure 2. Correlations between GEBVs for sward survival of two breeding populations (Hybrid and Gulf) across three locations and two fertilizer regimes (N0, No fertilization; N+, 112 kg ha−1). Diagonal plots are histograms of GEBV distribution plots and below the diagonal are scatterplots of GEBVs. Numbers above the line are Pearson's correlation coefficients between GEBVs. The GEBVs are derived from a model contrasting DNA pools collected before and after 3 years of sward establishment. GEBV, genomically estimated breeding values.
Table 1. Multivariate analysis of variance for allele frequency changes associated with sward survival selection within two generations of the hybrid breeding population established in different growing conditions
Note: Significance determined by permutation (50 000).
Abbreviations: df, degrees of freedom; SS, sum of squares; R2, coefficient of determination.
Table 2. Analysis of variance among changes in the predictedheading date for DNA pools after sward survival selection
Abbreviations: df, degrees of freedom; SS, sum of squares.
Table 3. Analysis of variance among changes in predicted winter survivorship for DNA pools after sward survival selection
Abbreviations: df, degrees of freedom; SS, sum of squares.
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原文链接:https://onlinelibrary.wiley.com/doi/10.1002/glr2.12035
内容来源:Grassland Research(草地研究)第1卷第4期(投稿:2022-11-18;接收:2022-12-09;刊发2023-01-11)
DOI:https://doi.org/10.1002/glr2.12035
引用格式:Tilhou, N. W., & Casler,M. D. (2022). Switchgrass sward establishment selection is consistent across multiple environments and fertilization levels. Grassland Research, 1(4),252–261.
文章信息编译者:范树高 鲁东大学 博士
说明:该文仅代表编译者对论文的理解,如需参考和引用相关内容,请查阅原文。
期刊介绍
Grassland Research是我国草业科学领域第一本国际学术期刊,季刊,由中国草学会和兰州大学共同主办。该刊受中国科技期刊卓越计划高起点新刊项目支持,由国际出版集团John Wiley & Sons Australia, Ltd.提供出版及宣传服务,于2022年正式出版。
Grassland Research论文刊发范围广,综合性强。从分子到全球变化层面,全维度聚焦草业科学及其在人类可持续发展中的作用。期刊将刊登天然草原,栽培草地、草坪和生物能源作物,以及草地生态系统三大板块的基础性和应用性研究成果、综述、论点等类型的文章。优先考虑发表青年学者优秀研究成果,期待成为青年科学家喜爱的国际学术交流主阵地。
在创刊前三年,Grassland Research将免收版面费,以OA形式通过全球化出版平台Wiley Online Library出版。
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审核|彭京伦 武艳培 王新宇
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