Rhizobial survival and nodulation of chickpea as influenced by fungicide seed treatment

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Abstract:

The survival of Rhizobium ciceri on chickpea (Cicer arietinum cv. Myles) seed, treated separately with 1 of 4 commercial fungicides, i.e., Apron®, Arrest 75W®, Crown®, or Captan®, was examined under laboratory conditions using standard serial dilution and plate count techniques. The resulting effects of fungicide–Rhizobium interactions on nodulation, N2 fixation, and plant growth were assessed in a controlled environment. Fungicide treatment decreased the number of viable rhizobia on the seed. In general, the toxicity of the fungicides in terms of rhizobial viability increased in the following order: Control = Crown < Arrest = Apron < Captan. Although Crown had no effect on rhizobial viability assessed under laboratory conditions, it significantly reduced nodulation, percent N derived from the atmosphere (%Ndfa), and shoot dry matter. Seed treated with Arrest and Captan decreased nodule dry weight and %Ndfa, but only Arrest reduced dry matter yield. Apron had no effect on any of the parameters measured at the early pod-filling stage and was compatible with the chickpea inoculum used in this study.Key words: fungicides, Rhizobium ciceri, inoculation, nodulation, chickpea, Cicer arietinum.

La survie de Rhizobium ciceri sur des graines de pois chiches (Cicer arietinum cv. Myles), traitées séparément avec un de quatre fongicides commerciaux, i.e., Apron®, Arrest 75W®, Crown® ou Captan®, fut analysée dans des conditions de laboratoire en utilisant des techniques courantes de dilution en série et de dénombrement bactérien. Les effets conséquents de l'interaction fongicide–Rhizobium sur la nodulation, la fixation du N2 et la croissance végétale ont été évalués dans un environnement contrôlé. Le traitement au fongicide a diminué le nombre de rhizobia viables sur la graine. En général, la toxicité des fongicides en terme de viabilité rhizobienne a augmenté selon l'ordre suivant: Témoin = Crown < Arrest = Apron < Captan. Bien que Crown n'a eu aucun effet sur la viabilité des rhizobia telle que mesurée dans les conditions de laboratoire, il a significativement diminué la nodulation, le pourcentage de N dérivé de l'atmosphère (%Ndfa) et la quantité de matière sèche de la pousse. Les graines traitées avec Arrest et Captan ont démontré un diminution du poids sec des nodosités et du %Ndfa, mais seulement Arrest a réduit le rendement en matière sèche. Apron n'a eu aucun effet sur les paramètres mesurés au stade précoce de remplissage de la cosse et était compatible avec l'inoculum pour pois chiches utilisé dans cette étude.Mots clés : fongicides, Rhizobium ciceri, inoculation, nodulation, pois chiches, Cicer arietinum.[Traduit par la Rédaction]

Keywords: Cicer arietinum; Rhizobium ciceri; chickpea; fongicides; fungicides; inoculation; nodulation; pois chiches

Document Type: Research Article

Publication date: June 1, 2001

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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