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Physiology of Sugar Accumulation in Carrot Breeding Lines and Cultivars1

1982; American Society for Horticultural Science; Volume: 107; Issue: 3 Linguagem: Inglês

10.21273/jashs.107.3.381

2327-9788

Gene E. Lester, L. R. Baker, John F. Kelly,

Plant nutrient uptake and metabolism

Abstract Cultivars and breeding lines of carrot ( Daucus carota L.) with established differences in sugar accumulation capacity were studied by growth analyses to identify associations of sugar content with other traits. Carrots were grown on both organic and sandy loam soils. At both locations the seasonal patterns for sugar content of a high sugar-accumulating cultivar/line (HSL) and a low sugar-accumulating cultivar/line (LSL) were similar. There was little or no association of growth indicators (dry weight accumulation, tap root dry weight, and leaf area index) with high or low sugar accumulation. Differences in sugar yields were associated with mean net assimilation rate ( ), mean relative growth rate ( ) and leaf area ratio (LAR) late in the growing season. The HSL had increasing ( , , and LAR, whereas LSL had decreasing , , and LAR late in the growing season. In general, carrot cultivars and breeding lines producing high free-sugar concentrations were distinguished from low sugar-accumulating carrots by delayed physiological maturity resulting in prolonged photosynthetic activity late in the growing season.