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Title: | The functional role of the photosynthetic apparatus in the recovery of Brassica napus plants from pre-emergent metazachlor exposure | Authors: | VERCAMPT, Hanne Koleva, L. Vassilev, A. HOREMANS, Nele BIERMANS, Geert VANGRONSVELD, Jaco CUYPERS, Ann |
Issue Date: | 2016 | Publisher: | ELSEVIER GMBH, URBAN & FISCHER VERLAG | Source: | JOURNAL OF PLANT PHYSIOLOGY, 196-197, p. 99-105 | Abstract: | Metazachlor is a chloroacetamide herbicide, frequently used in Brassica napus cultivations around the world. Its primary target is the inhibition of very long chain fatty acid biosynthesis. This study included a morphological and physiological screening of hydroponically grown B. napus, exposed to a concentration range of 0, 0.25, 0.50, 0.75 and 1.0 kg metazachlor per hectare. The results indicate that within a month after application, growth and development of B. napus are severely affected by low metazachlor doses. At intermediate metazachlor concentrations, loss of phosphorous and potassium from the plant tissues suggests destabilisation of cellular membranes, which may be a direct consequence of metazachlor application. This membrane instability could be indirectly linked with alterations of electron transport and a reduction of carbon assimilation. At increased metazachlor doses of 0.75 kg a.i. ha(-1), pigment concentrations are strongly reduced. However, chlorophyll fluorescence parameters seem to remain unaffected at metazachlor doses up to 0.75 kg a.i. ha(-1). At a metazachlor concentration of 1.0 kga.i. ha(-1), negative effects are observed on all tested parameters, resulting in limited survival. The results indicate photosynthesis is assured at intermediate metazachlor concentrations for the cost of growth and development. It is clear that photosynthesis plays a key role in the survival strategy of young plants to overcome initially induced chemical stress. (C) 2016 Elsevier GmbH. All rights reserved. | Notes: | [Vercampt, H.; Vangronsveld, J.; Cuypers, A.] Hasselt Univ, Ctr Environm Sci, Agoralaan Bldg D, B-3590 Diepenbeek, Belgium. [Koleva, L.; Vassilev, A.] Agr Univ Plovdiv, 12 Mendeleev St, Plovdiv 4000, Bulgaria. [Horemans, N.] Belgian Nucl Res Ctr SCK CEN, Biosphere Impact Studies, Boeretang 200, B-2400 Mol, Belgium. [Biermans, G.] FANC, Ravensteinstr 36, B-1000 Brussels, Belgium. | Keywords: | chloroacetamide herbicide; metazachlor; chlorophyll fluorescence; photosynthesis; crop injury; recovery; brassica napus; gas exchange;Chloroacetamide herbicide; Metazachlor; Chlorophyll fluorescence; Photosynthesis; Crop injury; Recovery; Brassica napus; Gas exchange | Document URI: | http://hdl.handle.net/1942/21577 | ISSN: | 0176-1617 | e-ISSN: | 1618-1328 | DOI: | 10.1016/j.jplph.2016.04.001 | ISI #: | 000376162400011 | Rights: | © 2016 Elsevier GmbH. All rights reserved. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2017 |
Appears in Collections: | Research publications |
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