The Effect of Sugar Beet Broadleaf Herbicides on Fluorescence Induction Curves in Amaranthus retroflexus L. and Portulaca oleracea L.

  • Ali Asghar CHITBAND Department of Plant Protection, Faculty of Agriculture, Lorestan University, Khorramabad
  • Reza GHORBANI Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad
  • Mohammad Hassan RASHED MOHASSEL Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad
  • Mahbubeh NABIZADE Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad

Abstract

Chlorophyll fluorescence analysis is a simple and rapid method for detecting herbicide effects after a short time following their application in photosynthetic apparatus in plants. Chlorophyll fluorescence measurements were carried out against two broad of weeds to describe how the Kautsky curve and its parameters were affected by herbicides. Desmedipham + phenmedipham + ethofumesate changed the chlorophyll fluorescence induction curve at all time intervals except four hours after spring (HAS) in Amaranthus retroflexus L. and at all doses of Portulaca oleracea L. 4 HAS. In contrast, chlorophyll fluorescence inhibition was evident by chloridazon at doses of 650 and 325 g a.i. ha-1 in P. oleracea and A. retroflexus respectively, for all time intervals. Furthermore, chlorophyll fluorescence decays only occurred by clopyralid in A. retroflexus at the highest dose. A biomass effective dose (ED50 and/or ED90) based on log-logistic dose-response curves for A. retroflexus were considerably higher than that of P. oleracea. The maximum quantum efficiency (FV/Fm) was stable, whereas the relative changes at the J step (Fvj) and area (the area between the Kautsky curve and the maximum fluorescence (Fm)) was more sensitive to all three herbicides. There was a relatively good correlation between fluorescence parameters taken 24 hours after the spraying and the dry matter taken three weeks later, for both species under study.

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Published
2017-09-30
How to Cite
CHITBAND, A. A., GHORBANI, R., RASHED MOHASSEL, M. H., & NABIZADE, M. (2017). The Effect of Sugar Beet Broadleaf Herbicides on Fluorescence Induction Curves in Amaranthus retroflexus L. and Portulaca oleracea L. Notulae Scientia Biologicae, 9(3), 433-442. https://doi.org/10.15835/nsb9310124
Section
Research articles
CITATION
DOI: 10.15835/nsb9310124