Multiple physiological mechanisms involved in reproduction could be targeted for breeding heat tolerance in lima bean

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Author(s)Ernest, Emmalea
Author(s)Wisser, Randall J.
Date Accessioned2024-03-08T18:16:57Z
Date Available2024-03-08T18:16:57Z
Publication Date2024-01-24
DescriptionThis article was originally published in Crop Science. The version of record is available at: https://doi.org/10.1002/csc2.21167. © 2023 The Authors. Crop Science published by Wiley Periodicals LLC on behalf of Crop Science Society of America.
AbstractWith global warming, the impact of high-temperature stress on crop production is one of the major issues facing agriculture. Combining a series of field and controlled environment experiments, the current study aimed at understanding causes of yield loss due to heat stress in lima bean (Phaseolus lunatus L.) in order to guide breeding for heat tolerance. A growth-stage analysis of multi-year field trials suggested that yields were reduced by sensitivity to heat during floral transition. High nighttime temperatures during this period were also associated with delayed pod set and subsequent harvest. These effects were validated in controlled environments, with additional tests revealing how nighttime heat stress generally reduces seeds per pod but can also reduce the number of pods set. Using an intra-plant dual temperature treatment design for vegetative and reproductive organs, it was determined that effects on pollen viability and release are primary factors underlying heat stress-associated yield losses in lima bean. Elevated nighttime temperatures did not reduce aboveground biomass, indicating the physiological basis for temperature sensitivity was not driven by a photosynthate deficit, but instead could be attributed to changes in source–sink dynamics. Still, the basis for sensitivity to heat differed among genotypes, opening new targets for a multi-mechanistic breeding approach for heat tolerance. Abbreviations BFB ‘Bush Florida Butter’ CelSel ‘C-elite Select’ FAO Food and Agriculture Organization FH242 ‘Fordhook 242’ GDD growing degree days HSI heat susceptibility index PGM pollen germination medium UAN urea ammonium nitrate
SponsorThis work was supported by the Delaware Department of Agriculture, Specialty Crop Block Grants No. 12-25-B-1661 and 16SCBGPDE0040. The authors thank Danielle Watkins for assistance with the controlled chamber experiments.
CitationErnest, E. G., & Wisser, R. J. (2024). Multiple physiological mechanisms involved in reproduction could be targeted for breeding heat tolerance in lima bean. Crop Science, 64, 179–191. https://doi.org/10.1002/csc2.21167
ISSN1435-0653
URLhttps://udspace.udel.edu/handle/19716/34153
Languageen_US
PublisherCrop Science
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
Keywordsclimate change
Keywordsheat stress
Keywordspollen viability
Keywordsreproductive biology
Keywordssource-sink dynamics
TitleMultiple physiological mechanisms involved in reproduction could be targeted for breeding heat tolerance in lima bean
TypeArticle
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