Genetic diversity of drought-avoidance root traits in the mini-core germplasm collection of chickpea uri icon

abstract

  • Shoot and root traits related to drought resistance were studied in Cicer arietinum accessions (211 lines) and 12 cultivars (controls), and in 10 accessions of wild relatives (C. yamashitae, C. reticulatum, C. bijugum, C. pinnatifidum, C. chorassanicum, C. judaicum and C. cuneatum) grown in poly(vinyl chloride) cylinders under drought conditions. The root and shoot growth of the wild species except C. reticulatum (ICC 17123 and ICC 17124) were relatively poor compared to the C. arietinum lines. The growth of C. reticulatum was almost as good as that of the C. arietinum accessions. Rooting depth was lowest (62.0 cm) in ICC 17241 (C. chorassanicum). The variation in rooting depth among the other wild species except C. reticulatum was not significant (73-91 cm). Rooting depth did not significantly vary among the cultivars. The accessions with deep root systems included ICC 1431, ICC 8350, ICC 15697, ICC 3512 and ICC 11498. The phase of linear root growth occurred earlier in the cultivars than in the wild species; thus, lower maximum rooting depth and dry weight were recorded for the latter. The highest root dry mass (more than 1.2 g per cylinder) was observed in ICC 5337, ICC 7255, ICC 13077, ICC 15294 and ICC 8261. Most of the wild species showed very low ratio of root to total plant biomass; the majority of the cultivars and C. arietinum accessions exhibited moderate values for this parameter. The total root dry mass exhibited a significant linear relationship with total shoot dry mass and total leaf area

publication date

  • 2003