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GrainGenes Reference Report: JPN-12-9

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Reference	JPN-12-9
Title	Genetic differences among barley cultivars and wild oat lines in endogenous seed nutrient levels, initial nitrate uptake rates, and growth in relation to nitrate supply
Journal	Journal of Plant Nutrition
Year	1989
Volume	12
Pages	9-35
Author	Konesky D Siddiqi M Glass A Hsiao A
Abstract	1 Net NO3- uptake rates and internal root NO3- contents were studied in 9 barley (Hordeum vulgare L. varieties and 5 genetically pure lines of wild oats (Avena fatua L. Significant differences in net NO3- uptake rates and [NO3-]e were found among barley cultivars while the NO3- uptake rates were only significantly different among wild oat lines No correlation existed between net NO3- flux and [NO3-]i in barley cultivars. 2. Net NO3- uptake isotherms were determined for 3 barley varieties, Compana, Fergus, and Betzes, and 3 wild oat lines, CS40, AN51, and SH319. Kinetic constants Vmax and Km, calculated for uptake rates of selected cultivars, indicate that net NO3- flux was generally higher for Compana than Fergus and Betzes. Although the wild oat lines had similar NO3- flux rates at higher [NO3-]e levels, CS40 had a higher net flux at lower nutrient levels. 3. Variations in growth characteristics were seen between 9 barley varieties and 5 wild oat lines at 4 different [NO3-]e levels (25, 50, 100, and 200 micromolar [NO3-]e). Variations were more apparent with the biomasses of the cultivars compared with the nutrient contents, suggesting that the intervarietal differences were not so much due to internal total nitrogen but the biomass of the plant. 4. Significant differences were seen among barley cultivars and among wild oat lines in seed N, P, and K levels. There was no correlation between the rankings of the seed N content and the growth at 25, 50, 100, or 200 micromolar [NO3-]e between barley cultivars or wild oat lines in our hydroponic system.
Keyword	[ Hide all but 1 of 12 ] avena fatua cultivar genotype-nutrition-interaction growth hordeum vulgare ion-uptake line-differences nitrate nitrogen-content nutrient-availability nutrient-uptake root

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