Osmotic potential at full turgor: an easily measurable trait to help breeders select for drought tolerance in wheat
2016
Mart, Kyle B. | Veneklaas, Erik J. | Bramley, Helen
This study investigated the relationship between osmotic potential at full hydration (π₁₀₀) and turgor loss point (ΨTLP) in wheat (Triticum aestivum) to determine the potential of using π₁₀₀ to predict ΨTLP under well‐watered (WW) and drought (WS) conditions. Two methods for determining π₁₀₀ were tested: pressure–volume (PV) analysis and freezing point osmometry. The study also measured π₁₀₀ in a range of 38 field‐grown wheat cultivars to determine whether there is genetic variation in π₁₀₀ under field conditions. π₁₀₀ correlated with ΨTLP using both methods under both water treatments, particularly WS. Genetic variation of π₁₀₀ in the field, under rainfed conditions, was greater than controlled conditions and ranged from −0.94 to −1.95 MPa. Overall, the evidence supports development of π₁₀₀ as a novel tool for plant breeders to screen large populations of wheat and identify genotypes with lower ΨTLP, an integrative trait that is related to drought tolerance.
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