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Genotypic difference in root penetration ability by durum wheat (Triticum turgidum L. var. durum) evaluated by a pot with paraffin-Vaseline discs

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Abstract

Improvement of root penetration (RP) ability in durum wheat (Triticum turgidum L. var. durum) is an important breeding target to reduce yield losses due to soil compaction and drought. This study investigated the genotypic difference of RP ability in durum wheat of seven Ethiopian landraces (ET genotypes), which were presumed to adapt to soil compaction, and 17 genotypes bred in North America (NA genotypes). The pregerminated seed was planted in a pot with four paraffin-Vaseline (PV) discs of hardness 0.12, 0.24, 0.50 and 0.73 MPa. After eight weeks from planting, each plant was sampled and the number of roots penetrating through the PV discs was counted. No genotype penetrated through the PV disc of 0.73 MPa hardness. The number of roots penetrating through the PV disc of 0.50 MPa hardness showed a significant difference among the genotypes: highest in an ET genotype and lowest in a NA genotype. The mean value was also significantly higher in ET genotypes than in NA genotypes, and it significantly correlated with root weight density below the disc and plant height. The mean root diameter and root weight density above the disc showed no significant difference between NA and ET genotypes. Our results indicate that a large genotypic difference exists for RP ability in durum wheat, and that ET genotypes have a higher RP ability than NA genotypes.

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Kubo, K., Jitsuyama, Y., Iwama, K. et al. Genotypic difference in root penetration ability by durum wheat (Triticum turgidum L. var. durum) evaluated by a pot with paraffin-Vaseline discs. Plant and Soil 262, 169–177 (2004). https://doi.org/10.1023/B:PLSO.0000037033.23964.54

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