{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T01:48:59Z","timestamp":1779155339027,"version":"3.51.4"},"reference-count":65,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2025,4,18]],"date-time":"2025-04-18T00:00:00Z","timestamp":1744934400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000199","name":"United States Department of Agriculture\u2014Agricultural Research Service (USDA-ARS)","doi-asserted-by":"publisher","award":["2020-21410-008-00D"],"award-info":[{"award-number":["2020-21410-008-00D"]}],"id":[{"id":"10.13039\/100000199","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000199","name":"United States Department of Agriculture\u2014Agricultural Research Service (USDA-ARS)","doi-asserted-by":"publisher","award":["2017\u201368005-26867"],"award-info":[{"award-number":["2017\u201368005-26867"]}],"id":[{"id":"10.13039\/100000199","id-type":"DOI","asserted-by":"publisher"}]},{"name":"National Institute of Food and Agriculture (USDA-NIFA)","award":["2020-21410-008-00D"],"award-info":[{"award-number":["2020-21410-008-00D"]}]},{"name":"National Institute of Food and Agriculture (USDA-NIFA)","award":["2017\u201368005-26867"],"award-info":[{"award-number":["2017\u201368005-26867"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Plants"],"abstract":"<jats:p>Guayule (Parthenium argentatum A. Gray) is a valuable domestic source for rubber and resin. At its center of origin in the Northern Mexico and Southern Texas deserts, guayule, a perennial shrub, is hybridized with its relative species mariola (Parthenium incanum Kunth). As rubber and resin are the main products derived from guayule, there is interest in using guayule bagasse as a bioenergy feedstock to meet the growing bioenergy and biofuel demands. This study aimed to explore and characterize phenotypic diversity in cell wall constituents (lignin, cellulose, and hemicellulose) and their yields among 51 guayule and mariola genotypes under two irrigation regimes (well-watered and water-stressed). Significant genotypic and environmental effects were observed for lignin, cellulose and hemicellulose concentrations, and yields, indicating the wide genetic variability of the collection for bioenergy-related traits. Moderate to high entry-mean heritability values for lignin, cellulose, and hemicellulose suggest that selection is feasible to enhance genetic gain. Significant positive correlations were found among cellulose and hemicellulose concentrations and yields, indicating the possibility to select multiple traits together during breeding cycles. High positive correlations between rubber and resin and lignin, cellulose, and hemicellulose yields highlight the opportunity to develop guayule germplasm with enhanced multi-use traits for industrial applications. Wide variations in drought stress indices (stress tolerance index, yield index, and yield stability index) underscore the environmental impact on the lignocellulosic traits. Several genotypes were identified with high stress index scores and could be parental candidates for improving guayule for arid and semi-arid sustainable agricultural systems. The current study is the first to characterize the phenotypic diversities in guayule and mariola for lignocellulosic components and yield, providing the foundation for future breeding efforts aimed at enhancing guayule\u2019s value for diverse production goals and environmental conditions.<\/jats:p>","DOI":"10.3390\/plants14081239","type":"journal-article","created":{"date-parts":[[2025,4,18]],"date-time":"2025-04-18T06:23:56Z","timestamp":1744957436000},"page":"1239","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Phenotypic Diversity in Cell Wall Lignocellulosic Constituents and Ethanol Yield of USDA Guayule and Mariola Germplasm"],"prefix":"10.3390","volume":"14","author":[{"given":"Hussein","family":"Abdel-Haleem","sequence":"first","affiliation":[{"name":"US Arid Land Agricultural Research Center, USDA-ARS, Maricopa, AZ 85138, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Steve","family":"Masterson","sequence":"additional","affiliation":[{"name":"Wheat, Sorghum and Forage Research Unit, USDA\u2013ARS, University of Nebraska-Lincoln East Campus, Lincoln, NE 68503, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aaron","family":"Sedivy","sequence":"additional","affiliation":[{"name":"Wheat, Sorghum and Forage Research Unit, USDA\u2013ARS, University of Nebraska-Lincoln East Campus, Lincoln, NE 68503, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rob","family":"Mitchell","sequence":"additional","affiliation":[{"name":"Wheat, Sorghum and Forage Research Unit, USDA\u2013ARS, University of Nebraska-Lincoln East Campus, Lincoln, NE 68503, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Singh, B.P. 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