biostudies-literatureDiedhiou IFondo Semilla 2024, Universidad EARTH3489https://www.ebi.ac.uk/biostudies/studies/S-EPMC12656148biostudies-literatureUnknown14(22)Climate change is a major constraint for common bean (<i>Phaseolus vulgaris</i> L.) cultivation in tropical regions, where elevated temperatures drastically affect reproductive efficiency and yield. This study aimed to evaluate the response of two local varieties, <i>Matambú</i> and <i>Tayní</i>, under passive induced heat using Open Top Chambers (OTC) in the humid tropics of Costa Rica. A factorial randomized block design with two genotypes and two environments (control and OTC) was applied to assess morphological, physiological, and yield-related traits. OTC increased daily maximum, minimum, and mean air temperatures by +2.29, +0.93, and +2.80 °C, respectively, and raised cumulative growing degree days by 325 °C·day<sup>-1</sup> compared with the control. Heat stress reduced grain yield Plants (Basel, Switzerland)Responses to Induced Passive Heat in Two Local Common Bean (<i>Phaseolus vulgaris</i> L.) Varieties Under Humid Tropical Field Conditions in Costa Rica.PMC12656148Fondo investigaciòn 2025, Universidad EARTHNavarrete OArguedas-Flatts YNJauregui JAAOtero JADiedhiou IRamirez-Tobias HMfalseResponses to Induced Passive Heat in Two Local Common Bean (<i>Phaseolus vulgaris</i> L.) Varieties Under Humid Tropical Field Conditions in Costa Rica.Climate change is a major constraint for common bean (<i>Phaseolus vulgaris</i> L.) cultivation in tropical regions, where elevated temperatures drastically affect reproductive efficiency and yield. This study aimed to evaluate the response of two local varieties, <i>Matambú</i> and <i>Tayní</i>, under passive induced heat using Open Top Chambers (OTC) in the humid tropics of Costa Rica. A factorial randomized block design with two genotypes and two environments (control and OTC) was applied to assess morphological, physiological, and yield-related traits. OTC increased daily maximum, minimum, and mean air temperatures by +2.29, +0.93, and +2.80 °C, respectively, and raised cumulative growing degree days by 325 °C·day<sup>-1</sup> compared with the control. Heat stress reduced grain yield 2025-01-01T00:00:00Z2025 Nov2026-06-05T03:15:04.364Z2026-06-05T03:06:41.114ZS-EPMC126561484130464010.3390/plants14223489