Abstract
Abstract: The objective of this work was to evaluate the efficiency of the straw and oxalic acid tests to identify resistance levels of white and colored cotton (Gossypium hirsutum) genotypes to white mold (Sclerotinia sclerotiorum). Ten genotypes were evaluated: five with colored fiber, four with white fiber, and a white-fiber susceptible genotype. The genotypes MAB-1 with white fiber and MAC-2 with colored fiber were the most resistant to white mold, according to the immersion in oxalic acid and straw tests, respectively. These genotypes can be recommended as resistance sources for breeding programs. Both assessed tests are complementary to each other; however, the straw test is more efficient in evaluating the resistance of cotton genotypes to white mold.
Highlights
Resistência de genótipos de algodoeiro a Sclerotinia sclerotiorum pelos métodos straw test e imersão em ácido oxálico
The pathogenesis of S. sclerotiorum requires the secretion of oxalic acid, which is fundamental for the virulence of the fungus (Liang et al, 2015; Uloth et al, 2015), as it participates in a series of complex reactions in the infectious process and is related to the modulation of programmed cell death (Williams et al, 2011)
Petzoldt & Dickson (1996) proposed a direct method for screening of resistance to white mold, in which the tip of the plant is exposed to the pathogen via an inoculated straw and the extension of the lesion on the plant apex is evaluated after eight days according to a scale of resistance (Singh et al, 2007)
Summary
Resistência de genótipos de algodoeiro a Sclerotinia sclerotiorum pelos métodos straw test e imersão em ácido oxálico. Petzoldt & Dickson (1996) proposed a direct method for screening of resistance to white mold, in which the tip of the plant is exposed to the pathogen via an inoculated straw and the extension of the lesion on the plant apex is evaluated after eight days according to a scale of resistance (Singh et al, 2007). The objective of this work was to evaluate the efficiency of the straw and oxalic acid tests to identify resistance levels of white and colored cotton genotypes to white mold.
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