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RGxE: An R Program for Genotype x Environment Interaction Analysis

American Journal of Plant Sciences 2017年第7期8卷 1672-1698页

作者： mahendra dia Todd C. Wehner Consuelo Arellano Department of Horticultural Science North Carolina State University Raleigh USA Statistics Department North Carolina State University Raleigh USA

Genotype x environmental interaction (GxE) can lead to differences in performance of genotypes over environments. GxE analysis can be used to analyze the stability of genotypes and the value of test locations. We developed an Rlanguage program (RGxE) that computes univariate stability statistics, descriptive statistics, pooled ANOVA, genotype F ratio across location and environment, cluster analysis for location, and location correlation with average location performance. Univariate stability statistics calculated are regression slope (bi), deviation from regression (S2d), Shukla’s variance (σi2), S square Wricke’s ecovalence (Wi), and Kang’s yield stability (YSi). RGxE is free and intended for use by scientists studying performance of polygenic or quantitative traits over multiple environments. In the present paper we provide the RGxE program and its components along with an example input data and outputs. Additionally, the RGxE program along with associated files is also available on GitHub at https://***/mahendra1/RGxE, http://***/todd-wehner/publications/software-sas-r-project/? and http://***/cucurbit/wehner/***.

关键词： Genotype x Environment Interaction R Programming Language RGxE Univariate Multivariate

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The Role of Cover Crops towards Sustainable Soil Health and Agriculture—A Review Paper

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American Journal of Plant Sciences 2018年第9期9卷 1935-1951页

作者： Parmodh Sharma Atinderpal Singh Charanjit Singh Kahlon Amandeep Singh Brar Kulbhushan K. Grover mahendra dia Robert L. Steiner Department of Applied Statistics and International Business New Mexico State University Las Cruces NM USA Department of Plant and Soil Science Texas Tech University Lubbock TX USA Department of Experiment Statistics Ag Center Louisiana State University Baton Rouge NC USA Department of Agronomy Punjab Agricultural University Ludhiana India Department of Plant and Environmental Sciences New Mexico State University Las Cruces NM USA Department of Horticultural Science North Carolina State University Raleigh NC USA

Cover crops are the plants which are grown to improve soil fertility, prevent soil erosion, enrichment and protection of soil, and enhance nutrient and water availability, and quality of soil. Cover crops provide several benefits to soils used for agriculture production. Cover crops are helpful in increasing and sustaining microbial biodiversity in soils. We summarized the effect of several cover crops in soil properties such as soil moisture content, soil microbial activities, soil carbon sequestration, nitrate leaching, soil water, and soil health. Selection of cover crops usually depends on the primary benefits which are provided by cover crops. Other factors may also include weather conditions, time of sowing, either legume or non-legume and timing and method of killing of a cover crop. In recent times, cover crops are also used for mitigating climate change, suppressing weeds in crops and increasing exchangeable nutrients such as Mg2+ and K+. Cover crops are also found to be economical in long-term experiment studies. Although some limitations always come with several benefits. Cover crops have some problems including the method of killing, host for pathogens, regeneration, and not immediate benefits of using them. Despite the few limitations, cover crops improve the overall health of the soil and provide a sustainable environment for the main crops.

关键词： Cover Crops Sustainable Agriculture Soil Health Legumes Soil Properties

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Stability of fruit quality traits in diverse watermelon cultivars tested in multiple environments

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Horticulture Research 2016年第1期3卷 1-11页

作者： mahendra dia Todd C Wehner Penelope Perkins-Veazie Richard Hassell Daniel S Price George E Boyhan Stephen M Olson Stephen R King Angela R Davis Gregory E Tolla Jerome Bernier Benito Juarez Department of Horticultural Science North Carolina State UniversityRaleigh27695-7609NCUSA Plants for Human Health Institute North Carolina Research Campus NCSUKannapolis28081NCUSA Clemson University Coastal Research and Education CenterCharleston29414SCUSA Georgia County Extension SW DistrictCordele31015GAUSA Department of Horticulture University of GeorgiaAthens30602GAUSA North Florida REC University of FloridaQuincy32351-5677FLUSA Department of Horticulture Science Texas A&M UniversityCollege Station77845TXUSA USDA-ARS Lane74555OKUSA Monsanto/Seminis Veg.Seeds Woodland95695CAUSA Sakata Seed America Inc.1833 Dunlap Pl.Woodland95776CAUSA

Lycopene is a naturally occurring red carotenoid compound that is found in *** has antioxidant *** content,sugar content and hollowheart resistance are subject to significant genotype×environment interaction(G×E),which makes breeding for these fruit quality traits *** objectives of this study were to(i)evaluate the influence of years and locations on lycopene content,sugar content and hollowheart resistance for a set of watermelon genotypes,and(ii)identify genotypes with high stability for lycopene,sugar,and hollowheart resistance.A diverse set of 40 genotypes was tested over 3 years and 8 locations across the southern United States in replicated,multi-harvest *** was tested in a subset of 10 *** were analyzed using univariate and multivariate stability statistics(BLUP-GGE biplot)using SASGxE and RGxE *** were strong effects of environment as well as G×E interaction on watermelon quality *** the basis of stability measures,genotypes were classified as stable or unstable for each quality trait.'Crimson Sweet'is an inbred line with high quality trait performance as well as trait stability.'Stone Mountain','Tom Watson','Crimson Sweet'and'Minilee'were among the best genotypes for lycopene content,sugar content and hollowheart *** developed a stability chart based on marketable yield and average ranking generated from different stability measures for yield attributes and quality *** chart will assist in choosing parents for improvement of watermelon *** http://***/cucurbit/wmelon/***.

关键词： stability. sugar stability

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RGxE: An R Program for Genotype x Environment Interaction Analysis

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American Journal of Plant Sciences 2017年第7期

作者： mahendra dia Todd C.Wehner Consuelo Arellano

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