Thesis
Potato Response to Heat Stress and Its Impact on Phenotype and Generative Attributes
Washington State University
Master of Science (MS), Washington State University
2023
DOI:
https://doi.org/10.7273/000006325
Abstract
Heat stress and heat events are increasing and threaten the viability of potatoes (Solanum tuberosum L.). It is vital to understand these affects to decrease crop loss, increase economic yield, and maintain food security. Heat stress alters physiological age (PAGE) and physiological maturity (PM) which can impact physiology, morphology, and phenotype. This study aims to 1) understand previous work spanning the impacts of heat stress on PAGE and PM and their relation to changes in yield, tuber size and quality, changes in phytohormone expression, and increased oxidative stress and 2) how altered planting times (mid-April “Early,” early-May “Mid,” and late-May “Late”) and postharvest heat age-priming treatments (12°C for 14 days [80 degree days (DD)] or 32°C for 21 days [600DD]) prior to storage at 4°C (95% RH) impact yield and aging (PAGE and chronological age [CAGE]) of tubers in the current and following generation in cultivars Russet Norkotah and Shepody. These data demonstrate that, throughout crop growth (134 days), GDD were higher in the late planting, and peak air and soil temperatures were higher earlier in development for the late planting, compared to the early planting. This impacted crop yield (as early season heat corresponded to a ca. 44% reduction in total yield), decreased tuber quality and economic value, and altered tuber size distribution. Generative studies revealed CAGE (80DD) and PAGE (600DD) impacted average stem numbers the following season. Additionally, postharvest heat treatments were found to impact respiration as late planted tubers had a lower (10%-Russet Norkotah) and higher (2%- Shepody) basal respiration rate than early planted tubers. Additionally, stem end sugar phenotypes were darker for early planted tubers with late season heat stress. Our data indicates opportunities for genetic improvement through altered planting practices to mitigate heat in-season to produce a high yield and high quality potatoes.
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Details
- Title
- Potato Response to Heat Stress and Its Impact on Phenotype and Generative Attributes
- Creators
- Morgan Danielle Southern
- Contributors
- Jacob M Blauer (Advisor)Carrie H Wohleb (Committee Member)Mark J Pavek (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- College of Agricultural, Human, and Natural Resource Sciences
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 99
- Identifiers
- 99901086723701842
- Language
- English
- Resource Type
- Thesis