HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Gutiérrez-Boem, F. H. Articles by Thomas, G. W. Search for Related Content PubMed Articles by Gutiérrez-Boem, F. H. Articles by Thomas, G. W. Agricola Articles by Gutiérrez-Boem, F. H. Articles by Thomas, G. W.

Phosphorus Nutrition Affects Wheat Response to Water Deficit

Cátedra de Fertilidad y Fertilizantes, Facultad de Agronomía, Univ. de Buenos Aires, Av. San Martín 4453, 1417 Buenos Aires, Argentina
Dep. of Agronomy, Univ. of Kentucky, N-122 Agric. Sci. Bldg. North, Lexington, KY 40506-0091

^* Corresponding author (gthomas{at}ca.uky.edu).

Plant leaf area affects both plant growth and yield. Although the effects of phosphorus and water availability on leaf area development have been studied as isolated factors, little work has been done on their possible interactions. A pot experiment was conducted to investigate the effects of both P and water availability on early leaf appearance and expansion in soft red winter wheat (Triticum aestivum L.), and to determine whether the effect of water deficit changes at each level of P nutrition and whether the soil water content affects plant P uptake. The soil was a Lonewood loam (fine-loamy, siliceous, mesic Typic Hapludult), which had an available P level of 8.2 mg P kg^–1 (Mehlich III). Additional P was applied at 0, 10 and 20 mg P kg^–1 soil. Water treatments consisted of keeping soil-water content at 80% (well watered) and 53% (stressed) of the I0 kPa soil-water content. Plant development, leaf appearance and expansion, and stomatal resistance were measured during the experiment. At harvest (38 d after emergence), leaf area, aboveground biomass, and P concentration were measured. Phosphorus and water availability exhibited a significant interaction on tiller and leaf appearance, which were reduced by water stress but only at 0 applied P. As individual factors, P and water influenced different plant features. Lack of applied P decreased the rate of leaf appearance and, therefore, the final number of leaves and leaf area per plant. Water deficit reduced individual leaf area and, at 0 applied P, reduced rate of leaf appearance, number of simultaneously expanding leaves, and final number of leaves. Phosphorus uptake was increased only with added soil P, and not by water stress. The ability of plants to cope with mild water stress was enhanced by adequate P nutrition.

Received for publication March 20, 1997.

This article has been cited by other articles:

				I. Faye, O. Diouf, A. Guisse, M. Sene, and N. Diallo Characterizing Root Responses to Low Phosphorus in Pearl Millet [Pennisetum glaucum (L.) R. Br.] Agron. J., August 3, 2006; 98(5): 1187 - 1194. [Abstract] [Full Text] [PDF]