Journal article
Impact of heat and drought stress on peroxisome proliferation in quinoa
The Plant journal : for cell and molecular biology, Vol.99(6), pp.1144-1158
09/2019
Handle:
https://hdl.handle.net/2376/100854
PMID: 31108001
Abstract
Summary
Although peroxisomes play a key role in plant metabolism under both normal and stressful growth conditions, the impact of drought and heat stress on the peroxisomes remains unknown. Quinoa represents an informative system for dissecting the impact of abiotic stress on peroxisome proliferation because it is adapted to marginal environments. Here we determined the correlation of peroxisome abundance with physiological responses and yield under heat, drought and heat plus drought stresses in eight genotypes of quinoa. We found that all stresses caused a reduction in stomatal conductance and yield. Furthermore, H2O2 content increased under drought and heat plus drought. Principal component analysis demonstrated that peroxisome abundance correlated positively with H2O2 content in leaves and correlated negatively with yield. Pearson correlation coefficient for yield and peroxisome abundance (r = −0.59) was higher than for commonly used photosynthetic efficiency (r = 0.23), but comparable to those for classical stress indicators such as soil moisture content (r = 0.51) or stomatal conductance (r = 0.62). Our work established peroxisome abundance as a cellular sensor for measuring responses to heat and drought stress in the genetically diverse populations. As heat waves threaten agricultural productivity in arid climates, our findings will facilitate identification of genetic markers for improving yield of crops under extreme weather patterns.
Significance Statement
Peroxisome proliferation is activated by drought and heat stresses through the PEX11‐dependent pathway. Accumulation of reactive oxygen species (ROS) and yield under stress conditions exhibit negative correlation with peroxisome abundance. Peroxisome abundance can be used as a proxy of ROS accumulation and an indicator of response to heat and drought stresses.
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Details
- Title
- Impact of heat and drought stress on peroxisome proliferation in quinoa
- Creators
- Leonardo Hinojosa - Washington State UniversityMarwa N.M.E Sanad - National Research CentreDavid E Jarvis - Brigham Young UniversityPatrick Steel - Durham UniversityKevin Murphy - Washington State UniversityAndrei Smertenko - Washington State University
- Publication Details
- The Plant journal : for cell and molecular biology, Vol.99(6), pp.1144-1158
- Academic Unit
- Crop and Soil Sciences, Department of; Biological Chemistry, Institute of
- Number of pages
- 15
- Grant note
- USDA NIFA OREI (#2016‐51300‐25808; #2016‐68004‐24770; #2017‐67013‐26200)
- Identifiers
- 99900546651101842
- Language
- English
- Resource Type
- Journal article