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

Abstract

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.

Water stress and warming impact nutrient use efficiency of Mombasa grass (Megathyrsus maximus) in tropical conditions

“…Evidences also indicated that both abiotic stresses (drought and warming) decrease the forage quality and digestibility of M. maximus due to increased content of fibres and lignin in leaves and reduced crude protein amount (Habermann, et al., 2019). However, root growth is often stimulated in plants growing under soil water scarcity, an acclimation response to find water in more deep soil layers (Thangthong et al., 2018).…”

Genotypic variation in root distribution changes and physiological responses of sugarcane induced by drought stress

“…1). The detailed method was clearly described in the previous studies (Thangthong et al, 2016; Thangthong et al, 2017), and the method was briefly described herein.…”

“…The front side of the boxes could be opened to see the transparent window. This method has been used to study root systems in some plant species, such as peanut (Thangthong et al, 2016; Thangthong et al, 2017) and Jerusalem artichoke (Puangbut et al, 2018).…”

“…The use of split-root systems to monitor the effect of root distributions on the development of the root system is very interesting (Neumann et al, 2009). The rhizobox is effective for displaying the characteristics of the root distribution and this method has been used in many plant species such as peanuts (Thangthong et al, 2016; Thangthong et al, 2017) and Jerusalem artichoke (Puangbut et al, 2018) in which different varieties showed differences in the root distribution patterns. The information on the changes in root distribution patterns under well-water condition and drought condition for characterization of sugarcane genotypes is still lacking.…”

Respostas Fisiológicas De Genótipos De Amendoim À Deficiência Hídrica

“…De acordo com Shen et al (2015), muitas pesquisas têm reportado a tolerância de amendoim à seca. Portanto, muitos programas de melhoramento de amendoim estão buscando aperfeiçoar a produtividade de genótipos sob deficiência hídrica (THANGTHONG et al, 2018).…”