Phosphorus (P) acquisition of cereal cultivars in the field at three levels of P fertilization (original) (raw)

Abstract

Low phosphorus (P) availability in soils and diminishing P reserves emphasize the need to create plants that are more efficient P users. Knowledge of P efficient germplasm among the existing cereal varieties may serve as the basis for improving soil P use by selection and breeding. We had identified some cereal cultivars (winter wheat: Kosack and Kraka; winter barley: Hamu and Angora; spring barley: Canut, Alexis, Salka, Zita;) which differed (p<0.05) in P depletion from thin slices (0.2 mm) of the rhizosphere soil under controlled conditions. In the present study, the same cultivars were studied under field conditions at three levels of P supply (no-P, 10 and 20 kg P ha-1) and the differences in P uptake as found in the previous work were confirmed. Under both conditions, the variation between the cultivars was greatest in soil without P fertilizers (no-P) for about 30 years. The variation in P uptake with most cultivars disappeared when 10 kg P ha-1 was applied. Root development did not differ between the cultivars much, but there was wide, consistent variation in their root hairs, regardless of growth media (solution, soil column and field). Increase in soil P level reduced the length of root hairs. The variation in root hairs between the cultivars was largest in no-P soil. When 10 kg P ha-1 was applied, the root hair lengths did not differ between the cultivars. Barley cultivars with longer root hairs depleted more P from the rhizosphere soil and also absorbed more P in the field. The relationship between root hairs and phosphorus uptake of the wheat cultivars was less clear. The wide variation in P uptake among the barley cultivars in the field and its relationship to the root hair development confirms that root hair length may be a suitable plant characteristic to use as criterion for selecting barley cultivars for P efficiency, especially in low-P soils.

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Authors and Affiliations

1. The Royal Veterinary and Agricultural University, Denmark
   Tara S. Gahoonia
2. Department of Agricultural Sciences, Plant Nutrition and Soil Fertility Laboratory, Thorvalsensvej 40, DK-1871, Frederiksberg C, Copenhagen, Denmark
   Niels E. Nielsen
3. Department of Plant Biology, Laboratory of Plant Physiology and Anatomy, Thorvalsensvej 40, DK-1871, Frederiksberg C, Copenhagen, Denmark
   Ole B. Lyshede

Authors

1. Tara S. Gahoonia
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2. Niels E. Nielsen
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3. Ole B. Lyshede
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Gahoonia, T.S., Nielsen, N.E. & Lyshede, O.B. Phosphorus (P) acquisition of cereal cultivars in the field at three levels of P fertilization.Plant and Soil 211, 269–281 (1999). https://doi.org/10.1023/A:1004742032367

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• Issue Date: April 1999
• DOI: https://doi.org/10.1023/A:1004742032367