Nitric oxide (NO) acts as an important signal molecule with diverse physiological functions in plants. In
this study we investigated the effects and possible mechanisms of exogenous NO on anthracnose caused
by Colletotrichum gloeosporioides in mango fruit. ‘Guifei’ mango fruit were treated with NO donor (sodium
nitroprusside of 0.1 mM) at 25 ◦C for 5 min, inoculated with spore suspension of C. gloeosporioides after
24 h of NO treatment, and stored at ambient temperature (25 ◦C). NO treatment effectively suppressed
lesion development on mango fruit inoculated with C. gloeosporioides, and lesion diameters at 2 through
8 d in NO-treated fruit averaged 30% lower than those in control fruit. Additionally, NO treatment reduced
natural anthracnose incidence and severity of mango fruit ripened at ambienttemperature, and the values
of both parameters from 4 to 10 d of storage in NO-treated fruit averaged 40 and 45% lower, respectively,
than those for control fruit. NO did not exhibit in vitro antifungal activity against C. gloeosporioides. NO
treatment enhanced the activities of defense-related enzymes including phenylalanine ammonia-lyase
(PAL), cinnamate-hydroxylase (C4H), 4-coumarate: CoA ligase (4CL), peroxidase (POD), -1,3-glucanase
(GLU) and chitinase (CHT). NO treatment also promoted the accumulation of total phenolics, flavonoids
and lignin that might contribute to inhibition of the pathogen. In addition to antifungal efficacy, NO treatment
delayed flesh softening, yellowing, and changes in soluble solids content(SSC) and titratable acidity
(TA), and peaks of respiration rate and ethylene production during ripening. These results suggest that
the resistance of NO-treated mango to anthracnose may be attributed to activation of defense responses
as well as delay of ripening.
Nitric oxide (NO) acts as an important signal molecule with diverse physiological functions in plants. Inthis study we investigated the effects and possible mechanisms of exogenous NO on anthracnose causedby Colletotrichum gloeosporioides in mango fruit. ‘Guifei’ mango fruit were treated with NO donor (sodiumnitroprusside of 0.1 mM) at 25 ◦C for 5 min, inoculated with spore suspension of C. gloeosporioides after24 h of NO treatment, and stored at ambient temperature (25 ◦C). NO treatment effectively suppressedlesion development on mango fruit inoculated with C. gloeosporioides, and lesion diameters at 2 through8 d in NO-treated fruit averaged 30% lower than those in control fruit. Additionally, NO treatment reducednatural anthracnose incidence and severity of mango fruit ripened at ambienttemperature, and the valuesof both parameters from 4 to 10 d of storage in NO-treated fruit averaged 40 and 45% lower, respectively,than those for control fruit. NO did not exhibit in vitro antifungal activity against C. gloeosporioides. NOtreatment enhanced the activities of defense-related enzymes including phenylalanine ammonia-lyase(PAL), cinnamate-hydroxylase (C4H), 4-coumarate: CoA ligase (4CL), peroxidase (POD), -1,3-glucanase(GLU) and chitinase (CHT). NO treatment also promoted the accumulation of total phenolics, flavonoidsand lignin that might contribute to inhibition of the pathogen. In addition to antifungal efficacy, NO treatmentdelayed flesh softening, yellowing, and changes in soluble solids content(SSC) and titratable acidity(TA), and peaks of respiration rate and ethylene production during ripening. These results suggest thatthe resistance of NO-treated mango to anthracnose may be attributed to activation of defense responsesas well as delay of ripening.
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