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Waterlogging Tolerance at Germination in Field Pea: Variability, Genetic Control, and Indirect Selection
Md Shahin Uz Zaman1,2,3, Al Imran Malik1, Parwinder Kaur1,2
1Centre for Plant Genetics and Breeding, UWA School of Agriculture and Environment, The University of Western Australia, Crawley, WA, Australia.
Frontiers in Plant Science
|August 17, 2019
Summary
Field pea (Pisum sativum L.) germination fails in waterlogged soils. Testa integrity is a reliable indicator for selecting waterlogging-tolerant pea varieties, aiding adaptation to extreme rainfall.
Area of Science:
- Agronomy
- Plant Genetics
- Crop Physiology
Background:
- Field pea (Pisum sativum L.) is a vital relay crop in the Eastern Gangetic Plain.
- Soil waterlogging (WL) frequently causes germination failure in field peas.
- Developing waterlogging-tolerant varieties is crucial for crop resilience.
Purpose of the Study:
- To assess the feasibility of selecting for waterlogging tolerance in field pea germination.
- To understand the genetic basis of waterlogging tolerance.
- To identify traits for indirect selection of waterlogging tolerance.
Main Methods:
- Screening of a recombinant inbred line (RIL) population and a diversity panel for germination under waterlogged and drained conditions.
- Evaluation of testa integrity (solute leakage) in selected tolerant and sensitive genotypes.
- Morphological characterization of the populations.
Main Results:
- Significant variation in germination under waterlogging was observed in both populations (RIL: 6-93%, Diversity Panel: 5-100%).
- High broad-sense heritability (H² > 85%) and continuous distribution suggest polygenic control of WL tolerance.
- Dark testa color was strongly associated with WL tolerance (90% of tolerant genotypes), while light testa color indicated sensitivity.
- Testa integrity showed a strong negative genetic correlation with WL tolerance (rG = -1.00 in RIL, rG = -0.90 in diversity panel).
Conclusions:
- Testa integrity is a highly effective trait for indirect selection of waterlogging tolerance in field pea germination.
- Selection for waterlogging tolerance at germination is feasible, enabling adaptation to extreme precipitation events.
- This research supports the development of resilient field pea varieties for challenging environmental conditions.
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