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Resistance to Sphaerotheca mors-uvae (Schw.) Berk. in Ribes nigrum L. 7. The mechanism of resistance of Ribes nigrum to Sphaerotheca mors-uvae (Schw.) Berk



Resistance to Sphaerotheca mors-uvae (Schw.) Berk. in Ribes nigrum L. 7. The mechanism of resistance of Ribes nigrum to Sphaerotheca mors-uvae (Schw.) Berk



Resistance to Sphaerotheca mors uvae Schw Berk in Ribes nigrum L 7 The mechanism of resistance of Ribes nigrum to Sphaerotheca mors uvae Schw Berk: 18



Using the susceptible varieties Silvergieter Zwarte Wellington XX, Brodtorp and Ojebyn, Sunderbyn II and R. dikuscha, which are resistant, selfed progeny from Sunderbyn II and the F1 of Sunderbyn II X Wellington XXX and Silvergieter Zwarte X Sunderbyn II, it is shown that (1) within two weeks of infection the ascorbic acid content of shoots increased in susceptible plants and decreased in resistant ones, while phenolic compounds increased in both groups; (2) the ratio o-dihydroxyphenols : ascorbic acid (P:A) was higher in resistant than in susceptible plants; (3) differences in the P:A ratios between resistant and susceptible hybrids increased with time following infection, differenccs at three weeks being significant; (4) the P:A ratios in resistant and susceptible plants from selfed Sunderbyn II, unlike other findings, were similar; (5) susceptible varieties formed two distinct groups with regard to peroxidase patterns as determined by polyacrylamide-gel electrophoresis while R. dikuscha and Sunderbyn II each had its own peroxidase pattern; and (6) R. dikuscha could be distinguished by an additional polyphenol oxidase band while Sunderbyn II could be distinguished by the stronger activity of the main band. It is concluded that the mechanism responsible for resistance to S. mors-uvae in shoots of R. nigrum appears to be associated with the balance of oxidative and reductive processes during primary infection. Earlier work, which has been noticed elsewhere, is summarized.

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