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Title: Distinct Preflowering Drought Tolerance Strategies of Sorghum bicolor Genotype RTx430 Revealed by Subcellular Protein Profiling

Abstract

Drought is the largest stress affecting agricultural crops, resulting in substantial reductions in yield. Plant adaptation to water stress is a complex trait involving changes in hormone signaling, physiology, and morphology. Sorghum (Sorghum bicolor (L.) Moench) is a C4 cereal grass; it is an agricultural staple, and it is particularly drought-tolerant. To better understand drought adaptation strategies, we compared the cytosolic- and organelle-enriched protein profiles of leaves from two Sorghum bicolor genotypes, RTx430 and BTx642, with differing preflowering drought tolerances after 8 weeks of growth under water limitation in the field. In agreement with previous findings, we observed significant drought-induced changes in the abundance of multiple heat shock proteins and dehydrins in both genotypes. Interestingly, our data suggest a larger genotype-specific drought response in protein profiles of organelles, while cytosolic responses are largely similar between genotypes. Organelle-enriched proteins whose abundance significantly changed exclusively in the preflowering drought-tolerant genotype RTx430 upon drought stress suggest multiple mechanisms of drought tolerance. These include an RTx430-specific change in proteins associated with ABA metabolism and signal transduction, Rubisco activation, reactive oxygen species scavenging, flowering time regulation, and epicuticular wax production. We discuss the current understanding of these processes in relation to drought tolerance and theirmore » potential implications.« less

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [2];  [2]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1755918
Report Number(s):
PNNL-SA-157472
Journal ID: ISSN 1422-0067
Grant/Contract Number:  
AC05-76RL01830; SC0014081
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Molecular Sciences (Online)
Additional Journal Information:
Journal Name: International Journal of Molecular Sciences (Online); Journal Volume: 21; Journal Issue: 24; Journal ID: ISSN 1422-0067
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; drought stress; adaptive mechanisms; proteomics; sorghum; preflowering; postflowering; drought tolerance; FLOWERING LOCUS C; rubisco activase; abscisic acid; abiotic stress; reactive oxygen species

Citation Formats

Ogden, Aaron J., Abdali, Shadan, Engbrecht, Kristin M., Zhou, Mowei, and Handakumbura, Pubudu P. Distinct Preflowering Drought Tolerance Strategies of Sorghum bicolor Genotype RTx430 Revealed by Subcellular Protein Profiling. United States: N. p., 2020. Web. doi:10.3390/ijms21249706.
Ogden, Aaron J., Abdali, Shadan, Engbrecht, Kristin M., Zhou, Mowei, & Handakumbura, Pubudu P. Distinct Preflowering Drought Tolerance Strategies of Sorghum bicolor Genotype RTx430 Revealed by Subcellular Protein Profiling. United States. https://doi.org/10.3390/ijms21249706
Ogden, Aaron J., Abdali, Shadan, Engbrecht, Kristin M., Zhou, Mowei, and Handakumbura, Pubudu P. Sat . "Distinct Preflowering Drought Tolerance Strategies of Sorghum bicolor Genotype RTx430 Revealed by Subcellular Protein Profiling". United States. https://doi.org/10.3390/ijms21249706. https://www.osti.gov/servlets/purl/1755918.
@article{osti_1755918,
title = {Distinct Preflowering Drought Tolerance Strategies of Sorghum bicolor Genotype RTx430 Revealed by Subcellular Protein Profiling},
author = {Ogden, Aaron J. and Abdali, Shadan and Engbrecht, Kristin M. and Zhou, Mowei and Handakumbura, Pubudu P.},
abstractNote = {Drought is the largest stress affecting agricultural crops, resulting in substantial reductions in yield. Plant adaptation to water stress is a complex trait involving changes in hormone signaling, physiology, and morphology. Sorghum (Sorghum bicolor (L.) Moench) is a C4 cereal grass; it is an agricultural staple, and it is particularly drought-tolerant. To better understand drought adaptation strategies, we compared the cytosolic- and organelle-enriched protein profiles of leaves from two Sorghum bicolor genotypes, RTx430 and BTx642, with differing preflowering drought tolerances after 8 weeks of growth under water limitation in the field. In agreement with previous findings, we observed significant drought-induced changes in the abundance of multiple heat shock proteins and dehydrins in both genotypes. Interestingly, our data suggest a larger genotype-specific drought response in protein profiles of organelles, while cytosolic responses are largely similar between genotypes. Organelle-enriched proteins whose abundance significantly changed exclusively in the preflowering drought-tolerant genotype RTx430 upon drought stress suggest multiple mechanisms of drought tolerance. These include an RTx430-specific change in proteins associated with ABA metabolism and signal transduction, Rubisco activation, reactive oxygen species scavenging, flowering time regulation, and epicuticular wax production. We discuss the current understanding of these processes in relation to drought tolerance and their potential implications.},
doi = {10.3390/ijms21249706},
journal = {International Journal of Molecular Sciences (Online)},
number = 24,
volume = 21,
place = {United States},
year = {Sat Dec 19 00:00:00 EST 2020},
month = {Sat Dec 19 00:00:00 EST 2020}
}

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