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Genetic and physiological traits for internal phosphorus utilization efficiency in rice.
Getnet Dino Adem1, Yoshiaki Ueda1, Patrick Enrico Hayes1,2
1Crop, Livestock and Environment Division, Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki, Japan.
Plos One
|November 5, 2020
Summary
Developing rice varieties with high phosphorus utilization efficiency (PUE) is crucial due to limited rock phosphate. P-efficient rice genotypes exhibit enhanced biomass and faster P starvation responses, involving gene expression changes for lipid remodeling.
Area of Science:
- Plant Physiology
- Agricultural Science
- Molecular Biology
Background:
- Phosphorus (P) is a vital macronutrient for plant growth, typically supplied by non-renewable rock phosphate fertilizers.
- Enhancing phosphorus utilization efficiency (PUE) in crops like rice is critical for sustainable agriculture.
- Genotypic variation in PUE necessitates investigation to identify and develop more efficient rice varieties.
Purpose of the Study:
- To investigate genotypic differences in traits associated with internal PUE in rice under phosphorus-deficient conditions.
- To understand the physiological and molecular mechanisms underlying differential PUE in rice genotypes.
- To identify rice varieties with superior PUE for potential breeding programs.
Main Methods:
- Comparative analysis of five rice genotypes grown under controlled P-deficient conditions.
- Measurement of total biomass, root biomass, and P content in various plant tissues.
- Analysis of leaf P concentrations over time and gene expression profiling of lipid metabolism-related genes (OsSQD2, OsMGD, OsDGD).
Main Results:
- P-efficient rice genotypes demonstrated higher total and root biomass, attributed to preferential P allocation to roots.
- High-PUE genotypes responded faster to P starvation by reducing leaf P concentrations more significantly and rapidly.
- Differential gene expression patterns for sulfolipid and galactolipid synthesis (OsDGD1, OsMGD3, OsDGD5, OsMGD1 & 2) were observed, particularly in younger leaves of high-PUE genotypes.
Conclusions:
- High PUE in rice is associated with enhanced biomass production and efficient P redistribution to growing tissues.
- Rapid reduction of leaf P concentrations and altered lipid metabolism, including galactolipid synthesis in young leaves, characterize P-efficient rice genotypes.
- These findings provide insights into the genetic basis of PUE and can guide the development of P-efficient rice varieties.
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