Effect of MgSO4 nutrition on Theobroma cacao L. susceptibility to Phytophthora megakarya infection - Publication - Bridge of Knowledge

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Effect of MgSO4 nutrition on Theobroma cacao L. susceptibility to Phytophthora megakarya infection

Abstract

A new strategy to reduce the severity of black pod disease (BPD) in T. cacao plants using MgSO4 nutrition was investigated. The dynamics of the tolerance to BPD of 18 susceptible T. cacao plantlets coming from the cross (♀SNK64 × ♂UPA14) was monitored during weekly (8 weeks) supply of MgSO4 into the soil. Prior to MgSO4 application, disease scores of the 18 plantlets (in six sets of three plantlets per set) were varying between 3.5 (susceptible) and 5 (highly susceptible). After MgSO4 application, a substantial decrease in disease scores was observed compared to the control. The percentage of disease tolerance gain of plantlets versus MgSO4 supplied (0–2.96 g) presented a quasi-hyperbolic curve with asymptotic line corresponding to 60% (day 28) and 70% (day 56) Cysteine content was not significantly different between the six triplets before MgSO4 nutrition. On days 28 and 56 of MgSO4 supplementation, cysteine content presented a pattern similar to the tolerance gain of plantlet sets. The monitoring of glutathione content versus MgSO4 supplementation (compared to day 0) showed sigmoid (day 28) and hyperbolic (day 56) curves which were associated with defined mathematical laws determined by MALAB software. Negative and highly significant correlations were observed between disease scores, cysteine and glutathione contents in leaves while positive and highly significant correlations were observed between cysteine and glutathione contents in leaves. These data might mean that MgSO4 nutrition significantly improved the tolerance of T. cacao. The mechanism of tolerance improvement might be associated with the synthesis of sulphur containing compounds.

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Authors (8)

  • Photo of Emile Minyaka

    Emile Minyaka

    • University of Douala Faculty of Science
  • Photo of Banen Madina

    Banen Madina

    • University of Douala Faculty of Science
  • Photo of dr hab. inż. Barbara Kusznierewicz

    Barbara Kusznierewicz dr hab. inż.

  • Photo of Omar Doungous

    Omar Doungous

    • IRAD Ekona Regional Research Centre Institute of Agricultural Research for Development
  • Photo of Soungouna Haouni

    Soungouna Haouni

    • University of Douala Faculty of Science
  • Photo of Joseph Hawadak

    Joseph Hawadak

    • University of Douala Faculty of Science
  • Photo of Nicolas Niemenak

    Nicolas Niemenak

    • Higher Teachers Training College of Yaoundé Department of Biological Science
  • Photo of Denis Ndoumou Omokolo

    Denis Ndoumou Omokolo

    • Higher Teachers Training College of Yaoundé Department of Biological Science

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DOI:
Digital Object Identifier (open in new tab) 10.17221/124/2016-PPS
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Copyright (Czech Academy of Agricultural Sciences)

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
PLANT PROTECTION SCIENCE no. 54, pages 74 - 82,
ISSN: 1212-2580
Language:
English
Publication year:
2018
Bibliographic description:
Minyaka E., Madina B., Kusznierewicz B., Doungous O., Haouni S., Hawadak J., Niemenak N., Omokolo D.: Effect of MgSO4 nutrition on Theobroma cacao L. susceptibility to Phytophthora megakarya infection// PLANT PROTECTION SCIENCE. -Vol. 54, (2018), s.74-82
DOI:
Digital Object Identifier (open in new tab) 10.17221/124/2016-pps
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