Abstract
The effect of barley seed treated with chlorothalonil fungicide on mycorrhizal root colonization was evaluated. The treatments were: 1) Seed with Mycorrhizal INIFAP?, one, two and three doses, and uninoculated seed; 2) Seed with and without fungicide. Monthly seed plantings were performed with different storage time, looking forward to assessing the colonization degree of the roots. As revealed by the results, the seed treated with chlorothalonil did not lower the root colonization by Mycorrhizal INIFAP?; the chlorothalonil treatment had a 32.63% average root colonization, whereas without chlorothalonil, it was 36.46%. When the seed was treated with root colonization by Mycorrhizal INIFAP?, this was lower in the treatment with one dose; no significant difference was revealed by the treatments with either double or triple doses. The colonization percentage was progressively decreased by seed storage. The root colonization by Mycorrhizal INIFAP?, throughout the inoculated seed storage time, remained constant and unchanged for the first six months, but then decreased in 50% within a 10-month period for both treated and not treated fungicide seed.
Highlights
Barley crop in Mexico is basically oriented to malt elaboration for beer production [1,2,3]
The root colonization by Mycorrhizal Investigaciones Forestales Agrícolas y Pecuarias (INIFAP)® percentage was significantly decreased by 2.42% by the seed treatment with chlorothalonil; still, since this assessment was carried out after 20 days, such decrease shall be recovered as the crop develops itself
The most affected treatment, with regards to root colonization by Mycorrhizal INIFAP® with chlorothalonil treated was the treatment conducted with a single dose
Summary
Barley crop in Mexico is basically oriented to malt elaboration for beer production [1,2,3]. Seed supplying and crop management recommendations are provided by IASA; fertilizers, insecticides, herbicides and fungicides are acquired with local distributors [4]. Grageda-Cabrera et al / Agricultural Sciences 4 (2013) 738-743 barley demand and beer production, which consists on permanently fostering the development of an improved malting barley variety, aiming to achieve a high agricultural and industrial quality; such endeavor has been developed since 1961, when both the malting industry and the Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias (INIFAP) celebrated the first cooperation agreement, aiming for the improvement of malting barley crop in the country. A lack of knowledge concerning the symbiosis effectiveness among the pesticide-crop-biofertilizer specific interaction prevails because Mycorrhizal INIFAP® is a fungus and barley seed is treated with fungicides [7,8]. The present study is aimed to evaluate the effect derived from the barley seed treatment with chlorothalonil fungicide on root colonization by Mycorrhizal INIFAP® at different storage times
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