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This article in AJ

  1. Vol. 86 No. 3, p. 487-491
     
    Received: Apr 5, 1993
    Published: May, 1994


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doi:10.2134/agronj1994.00021962008600030006x

Plant Development, Water Relations, and Carbon Allocation of Heart-Podded Hoary Cress

  1. Richard F. Miller ,
  2. Tony J. Svejcar,
  3. Jeffrey A. Rose and
  4. Michael L. McInnis
  1. D ep. of Rangeland Resources, Oregon State Univ.
    U SDA-ARS, Eastern Oregon Agric. Res. Ctr., HC 71 4.51 Hwy 205, Burns, OR 97720
    D ep. of Rangeland Resources, Oregon State Univ., Corvallis, OR 97331

Abstract

Abstract

Attempts to control the noxious weed heart-podded hoary cress [Cardaria draba (L.) Desv.] in the Pacific Northwest have been relatively ineffective, and this species has expanded its distribution from irrigated hayland onto adjacent semiarid rangelands. The objective of this study was to define the seasonal pattern of development and biological activity of heart-podded hoary cress growing on semiarid rangeland. The study was conducted in the field over a 2-yr period on a terrace site that has deep Cumulic Haploxeroll soil and an adjacent upland site that has a shallow Lithic Argixeroll soil. Soil water content, phenology, xylem pressure potential and leaf conductance were measured at both sites. Aboveand belowground biomass and spring C allocation pattern, determined by labeling plants with UC, were measured at the terrace location. Regardless of location, no heart-podded hoary cress seedlings were found; all shoots developed from rhizome buds. The majority (76%) of heartpodded hoary cress biomass was located belowground. Although drought occurred earlier on the upland than the terrace site, phenology was similar on the two sites. Carbon was translocated to belowground tissues within 1 h of labeling and reached peak accumulation within 24 h. The greatest 13C enrichment of roots and rhizomes occurred during the flowering stage. The peak in belowground C allocation occurred at a stage when leaf conductance was declining rapidly. The short period of maximum C allocation to belowground tissue, the large proportion of belowground tissue, and the wide variation of phenology among plants at a given time may account for the difficulty in chemically controlling this species.

The Eastern Oregon Agric. Res. Ctr., including the Burns and Union stations, is jointly operated by the Oregon Agric. Exp. Stn. of Oregon State Univ. and the USDA-ARS. Funding for this project was provided by the USDA Integrated Pest Management Project (CRIS No. 0136449) and the Eastern Oregon Agric. Res. Ctr. Tech. 10,361.

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