Drought resistance in a Pisum working collection assessed by mathematical indices
Abstract
Aim of study: The breeding of drought-resistant varieties represents one of the principal challenges facing modern agriculture in the context of ongoing climate change. Pea (Pisum sativum L.) is among the most significant legume requiring new stress-resistant sources for cultivation in atypical ecological and geographical regions or conditions. The aim of this study was to verify the possibility of using mathematical indices for evaluating drought resistance, select the most practical indices to use, and evaluate drought resistance of pea varieties.
Area of study: The study was conducted in the eastern forest-steppe of Ukraine.
Material and methods: The drought resistance of 25 pea varieties was evaluated over a 13-year period (2008-2020) using 15 mathematical indices.
Main results: The most accurate indices for evaluating drought tolerance in pea varieties were shown to be the drought resistance index (DI), geometric mean productivity (GMP), abiotic tolerance index (ATI), index of stress tolerance (TOL) and percent yield reduction (PYR). Pea varieties ‘Blahodatnyy’, ‘Gotik’, ‘Intensyvnyy 92’, ‘Kharkivskyy 302’, ‘Kharkivskyy 85’, ‘Kharkivskyy yantarnyy’, ‘Magnat’, and ‘Resonator’ were identified as drought-resistant with a sum of indices ranks of 75 and high productivity in dry years of 1.5 ×103 kg/ha. Variety ‘Blahodatnyy’ produced the highest yield in favourable conditions (3.1×103 kg/ha). It also had the highest potential (4.5×103 kg/ha). The highest productivity was recorded for variety ‘Kharkivsky 302’ under stressful conditions (1.9×10³ kg/ha), with the smallest range of variation between favourable and stressful conditions (1.0×10³ kg/ha).
Research highlights: The eight pea varieties mentioned above have been identified as being of significant importance in the context of breeding for drought tolerance.
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References
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