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Plant Biol (Stuttg) 2001; 3(4): 326-334
DOI: 10.1055/s-2001-16450
Original Paper
Georg Thieme Verlag Stuttgart ·New York

Effects of Water and Nitrogen Supply on Water Use Efficiency and Carbon Isotope Discrimination in Edible Canna (Canna edulis Ker-Gawler)

H. Brück 1 , C. Jureit 1 , M. Hermann 2 , A. Schulz 3 , B. Sattelmacher 1
  • 1 Institute of Plant Nutrition and Soil Science, University of Kiel, Kiel, Germany
  • 2 International Potato Centre (CIP), Apartado Postal 1558, Lima 12, Peru
  • 3 Department of Plant Biology, The Royal Veterinary and Agricultural University, Frederiksberg C, Copenhagen, Denmark
Further Information

Publication History

December 23, 1999

March 14, 2001

Publication Date:
16 August 2001 (online)

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Abstract

Transpirational water use efficiency (WUE) is affected by nutrient and water supply, but relatively little is known about the response of Andean root and tuber crops, such as edible canna (Canna edulis Ker-Gawler). Two Canna edulis genotypes were studied in semi-controlled greenhouse experiments at the International Potato Centre (CIP) near Quito, Ecuador. Under conditions of low water supply, shoot dry matter (DM), leaf area and specific leaf nitrogen (SLN) all decreased, while WUE was higher and carbon isotope discrimination (Δ) decreased. The large water-storing hypodermal cells characteristic of this plant's leaf morphology shrank, concertina-like, the leaves became thinner, and the specific leaf area increased significantly (from 26 m-2 kg-1 to 43 m-2 kg-1). In a second experiment, plants were grown with three different levels of nitrogen supply: from low to high N supply, shoot DM increased significantly (from 16 to 37 g), along with leaf area and SLN. At the lowest level of nitrogen supply (N0), WUE was significantly lower and Δ increased. As expected, the linear correlation between Δ and WUE was negative, but variation in Δ could only explain 49 % of the variation in WUE. If, in addition to Δ, measured root fraction (RF) and estimated values of leaf-to-air vapour pressure deficit (Δe) and respiratory and unproductive carbon loss were used to calculate WUE, the correlation between measured and calculated WUE was substantially improved, except for the water stress treatment. It is considered that, for root and tuber crops, RF and Δe are the major variables when Δ of single leaves is to be used for up-scaling to plant WUE.

Abbreviations

DM: dry matter

Δ: carbon isotope discrimination

LAR: leaf area ratio

pi: intercellular concentration of CO2

RF: root fraction

SLA: specific leaf area

SLN: specific leaf nitrogen

WUE: physiological water use efficiency

WUES: physiological water use efficiency based on shoot DM

Key words

Carbon isotope discrimination - Canna edulis - water use efficiency - hypodermis - SLA - LAR - RF - SLN

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H. Brück

Institute of Plant Nutrition and Soil Science
University of Kiel

Olshausenstr. 40
24118 Kiel
Germany

Email: hbrueck@plantnutrition.uni-kiel.de

Section Editor: H. Rennenberg

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