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Root distribution patterns of peanut genotypes with different drought resistance levels under early‐season drought stress

Thangthong, N., Jogloy, S., Jongrungklang, N., Kvien, C. K., Pensuk, V., Kesmala, T., Vorasoot, N.
Journal of agronomy and crop science 2018 v.204 no.2 pp. 111-122
crop yield, cultivars, drought, drought tolerance, field crops, genotype, nutrients, peanuts, root systems, roots, soil, water stress, Thailand
Drought severely limits crop yield of peanut. Yet cultivars with enhanced root development enable the exploration of a greater volume of soil for water and nutrients, helping the plant survive. Root distribution patterns of three genotypes (ICGV 98305, ICGV 98324 and Tifton‐8) were compared when grown in well‐watered rhizoboxes and when grown in rhizoboxes where an early‐season drought was imposed using rain‐exclusion shelters. The treatments were arranged in a completely randomized design with three replications, and the experiment was conducted during two seasons at the Field Crop Research Station of Khon Kaen University, in Khon Kaen, Thailand. The root system of ICGV 98305, when grown under drought, had a significantly higher root length in the 30–110 cm deep soil layers and less roots in the 0–30 cm soil layers when under drought than when grown under well‐watered conditions. Roots of Tifton‐8 had the largest reductions in root length in upper soil layer and reduced in most soil layers. Tifton‐8 grown under drought was smaller than under well‐watered control for all root traits, showing negative response to drought. The peanut genotypes with high root traits in deeper soil layer under early‐season drought might contribute to drought avoidance mechanism.