Naranjo Pompa, TomásCuñado Rodríguez, NievesSantos Coloma, Juan Luis2025-10-172025-10-172022-06-23Naranjo, T., Cuñado, N., & Santos, J. L. (2022). Assessing the Heat Tolerance of Meiosis in Spanish Landraces of Tetraploid Wheat Triticum turgidum. Plants, 11(13). https://doi.org/10.3390/PLANTS111316612223-774710.3390/plants11131661https://hdl.handle.net/20.500.14352/125049This work was supported by grant AGL2015-67349-P from Ministerio de Economía y Competitividad of Spain and grant PID2020-118038GB-I00 from Ministerio de Ciencia e Innovación of Spain.Heat stress alters the number and distribution of meiotic crossovers in wild and cultivated plant species. Hence, global warming may have a negative impact on meiosis, fertility, and crop productions. Assessment of germplasm collections to identify heat-tolerant genotypes is a priority for future crop improvement. Durum wheat, Triticum turgidum, is an important cultivated cereal worldwide and given the genetic diversity of the durum wheat Spanish landraces core collection, we decided to analyse the heat stress effect on chiasma formation in a sample of 16 landraces of T. turgidum ssp. turgidum and T. turgidum ssp. durum, from localities with variable climate conditions. Plants of each landrace were grown at 18–22 °C and at 30 °C during the premeiotic temperature-sensitive stage. The number of chiasmata was not affected by heat stress in three genotypes, but decreased by 0.3–2 chiasmata in ten genotypes and more than two chiasmata in the remaining three ones. Both thermotolerant and temperature-sensitive genotypes were found in the two subspecies, and in some of the agroecological zones studied, which supports that genotypes conferring a heat tolerant meiotic phenotype are not dependent on subspecies or geographical origin. Implications of heat adaptive genotypes in future research and breeding are discussed.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal articlehttps://doi.org/10.3390/plants11131661https://www.mdpi.com/2223-7747/11/13/1661open access633.11(460)581.15581.5632.111Heat stressChiasmataDurum wheatGenetic diversityBotánica (Biología)GenéticaAgricultura2417 Biología Vegetal (Botánica)2417.14 Genética Vegetal3103 Agronomía3103.09 Cultivos de Plantas