Determining the Critical Period of Continuous Waterlogging in Maize: An Analysis of Physiological, Biochemical, and Transcriptomic Traits
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View abstract on PubMed
Summary
This summary is machine-generated.Maize yield is significantly reduced by waterlogging stress lasting over six days during the jointing stage. This critical duration impairs photosynthesis, energy synthesis, and nutrient transport, leading to substantial grain weight loss.
Area Of Science
- Agricultural Science
- Plant Physiology
- Molecular Biology
Background
- Waterlogging stress severely impacts crop photosynthesis and energy supply, leading to yield reductions.
- The critical duration of waterlogging and its molecular effects on maize photosynthesis and energy synthesis are not well understood.
Purpose Of The Study
- To investigate the critical duration of waterlogging stress during maize jointing stage.
- To analyze physiological, transcriptomic, and yield responses to waterlogging.
- To elucidate the molecular mechanisms of waterlogging stress on photosynthetic efficiency and energy synthesis.
Main Methods
- Maize plants were subjected to varying waterlogging durations (0-10 days) during the jointing stage.
- Physiological traits, including grain weight, chlorophyll content, and photosynthetic efficiency, were measured.
- Transcriptomic analysis was performed to identify gene expression changes related to photosynthesis and energy metabolism.
Main Results
- Grain weight significantly decreased after 4 days of waterlogging, with a 100% loss at 10 days.
- Waterlogging increased malondialdehyde content, decreased antioxidant enzyme activity, chlorophyll content, and net photosynthetic efficiency.
- Genes involved in photosystem I, ATP synthesis, and carbohydrate metabolism were downregulated with prolonged waterlogging.
Conclusions
- Six days of waterlogging is the critical threshold for significant yield loss in maize.
- Waterlogging beyond six days impairs energy synthesis and nutrient transport, severely affecting grain development.
- Understanding these responses is crucial for developing waterlogging-tolerant maize varieties.
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