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This article in CS

  1. Vol. 50 No. 1, p. 246-252
     
    Received: Mar 10, 2009


    * Corresponding author(s): david@uckac.edu
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doi:10.2135/cropsci2009.03.0127

Ozone Impacts on Assimilation and Allocation to Reproductive Sinks in the Vegetatively Propagated C4 Weed, Yellow Nutsedge

  1. David A. Grantz *a,
  2. Anil Shresthab and
  3. Hai-Bang Vua
  1. a Dep. of Botany and Plant Sciences, Univ. of California at Riverside, Kearney Agricultural Center, 9240 South Riverbend Ave., Parlier, CA 93648
    b Dep. of Plant Science, California State Univ., 2415 E. San Ramon Ave., Fresno, CA 93740

Abstract

Crop production in many irrigated agricultural regions is challenged by both air pollution and weed pressure. Impacts of ozone (O3) on C4 plants have received little attention. Yet many important crops and weeds utilize the C4 pathway, including yellow nutsedge (Cyperus esculentus L.). A previous study suggested that this species may respond to O3 exposure with enhanced allocation of biomass below ground, including potentially to reproductive tubers, an apparent exception to the general weakening of belowground sink strength. This hypothesis was not supported by the current experiments, as exposure to 60 nL L−1 and 115 nL L−1 O3 (12-h daylight mean O3 concentration) reduced biomass allocation to tubers, relative to 4 nL L−1 Chlorophyll content, specific leaf weight, and carbon assimilation were reduced, while intercellular CO2 concentration increased, reducing water use efficiency. We conclude that (i) this C4 species exhibits substantial sensitivity to ambient O3; (ii) O3–inhibition of allocation belowground is not limited to roots but also applies to tubers; and (iii) the O3 component of global change will increase the competitiveness of nutsedge with respect to specific crops as shown previously, but will decrease tuber production and degrade water use efficiency of this challenging C4 weed.

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