Abstract
The progress in identification of genotypes with roots showing greater ability to penetrate compacted soils under moisture stress and understanding the physiological basis and morphological expression of the characteristics associated is fundamental to improving crop’s tolerance to drought and to increase productivity under individual and combined stress conditions. Our objectives were to: (i) determine genotypic differences in root penetration ability of common bean (Phaseolus vulgaris L.) using two methods (compacted soil layers and wax-petrolatum layers) to simulate soil compaction; and (ii) identify the morpho-physiological characteristics associated with the ability to penetrate compacted layers under well-watered and intermittent drought conditions in a greenhouse environment. Six common bean genotypes of different origin (Andean, Mesoamerican and interspecific) were tested in two trials. In the first trial, we evaluated genotypic differences in morpho-physiological characteristics that were associated with the root’s ability to penetrate compacted soil layers of 1.2, 1.4, and 1.6 g cm−3 bulk densities. In the second trial, we used another method to determine genotypic differences in root’s ability to penetrate wax-petrolatum layers of low, medium, and high mechanical impedance. The conditions for root growth were severely restricted by compaction and aggravated by drought stress. The medium level of mechanical impedance of wax petrolatum layer method showed the best results to evaluate bean genotypes for soil compaction tolerance. Among the six genotypes tested, ALB 91 (an interspecific line) was identified as the one with the greatest root penetration ability compared with A774 which showed the lowest root penetration ability under both well-watered and drought conditions.
Highlights
Common bean (Phaseolus vulgaris L.) is the most important grain legume for human consumption and it is grown by small farmers in marginal areas and with minimal use of inputs (Thung and Rao 1999; Beebe et al 2013)
It was observed that G × bulk density (BD) interaction accounted for 68% of the variation in pod biomass which was more than three times higher than that attributed to G alone under drought conditions (Table 1)
The G × BD interaction accounted for 44% and 64% of the variation under wellwatered and drought conditions, respectively, indicating a greater interaction effect than with G alone effect (Table 1), evidencing that the compaction aggravates the effects of drought stress (Table 1)
Summary
Common bean (Phaseolus vulgaris L.) is the most important grain legume for human consumption and it is grown by small farmers in marginal areas and with minimal use of inputs (Thung and Rao 1999; Beebe et al 2013). The development of common bean cultivars adapted to drought conditions in compacted soils is an important strategy that contributes to food security in the face of climate change. Identification of key plant traits and understanding physiological mechanisms that contribute to improved drought adaptation in common bean can increase the efficiency of breeding programs through selection of superior genotypes for these soil conditions (Beebe et al 2013). Pore connectivity, infiltration, air permeability, temperature, rooting space, nutrient flow, and soil biological activity (Kozlowski 1999; Khan et al 2017).
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