Suspensions infectivity of Pyricularia oryzae with different periods of conservation
DOI:
https://doi.org/10.47133/IEUNA2121bKeywords:
brusone, inoculum conservation, genetic resistance, wheatAbstract
Wheat Blast, caused by Pyricularia oryzae patotype Triticum, is one of the greatest threats to wheat production in South America (5-100% losses). One of the still unknown characteristics of the pathogen is the period for which inoculum suspensions can be kept. Knowing this aspect would allow planning tests to search for resistant genotypes with a large number of lines. The objective of the work was to determine the infectivity of Pyricularia oryzae suspensions with different conservation periods (0, 8, 15, 24 and 30 days) in two varieties of wheat (Caninde 1 and Caninde 11), under field and greenhouse conditions. It was observed that the longer the inoculum conservation time, the infection capacity of P. oryzae conidia decreases in both varieties. Suspensions with zero days of conservation infected both varieties with a higher rate in the two evaluation periods. Relating the infection means and the amount of ungerminated spores in the suspensions with different conservation periods, in variety Caninde 1, the correlation coefficient was 0.98, while in variety Caninde 11 it was 0.97; These values indicate a strong correlation between the variables, since as the number of ungerminated conidia increases, the infection capacity of the suspensions increases. The Caninde 1 and Caninde 11 varieties showed a resistant and susceptible reaction, respectively, against the Pyricularia oryzae strain P014-038.
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Copyright (c) 2021 Oscar Frutos, Yessica Reyes, Alice Chávez, Mohan Kolhi
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