Chlorophyll fluorescence parameters characterizing the development of two cacao genotypes infected by witches broom

Greenhouse-grown susceptible 20-d-old seedlings of Theobroma cacao genotypes Catongo and tolerant genotype SCA6xCatongo were inoculated with a mixture of isolates of Crinipellis perniciosa, the causal agent of witches' broom. The characteristics of chlorophyll a fluorescence emission were monit...

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Bibliographic Details
Published in:Photosynthetica 1998-01, Vol.35 (1), p.29-39
Main Authors: Santos, I.C.F. (Universidade Federal de Bahia, Salvador (Brazil). Inst. de Biologia), De Almeida, A.-A.F, Valle, R.R
Format: Article
Language:English
Subjects:
CHLOROPHYLLE
CHLOROPHYLLS
CLOROFILAS
CRINIPELLIS PERNICIOSA
DISEASE RESISTANCE
FLUORESCENCE
FLUORESCENCIA
FOTOSINTESIS
FOTOSISTEMAS
GENOTIPOS
GENOTYPE
GENOTYPES
HIBRIDOS
HYBRIDE
HYBRIDS
PHOTOSYNTHESE
PHOTOSYNTHESIS
PHOTOSYSTEME
PHOTOSYSTEMS
RESISTANCE AUX MALADIES
RESISTENCIA A LA ENFERMEDAD
THEOBROMA CACAO
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Summary:Greenhouse-grown susceptible 20-d-old seedlings of Theobroma cacao genotypes Catongo and tolerant genotype SCA6xCatongo were inoculated with a mixture of isolates of Crinipellis perniciosa, the causal agent of witches' broom. The characteristics of chlorophyll a fluorescence emission were monitored during leaf ontogeny. In both inoculated and non-inoculated genotypes, significant differences were found for the effective quantum yield values of photosystem (PS) 2 (delta/Fm') at the B (7 to 14-d-old), D (21 to 30-d-old), and E (30-d-old) stages of leaf development, and in quantum yield of the non-cyclic photosynthetic electron transport between PS2 and PS1 [qp(Fv/Fm)] and quencher efficiency [(Fm-Ft)/F0] at the B, C (15 to 20-d-old) and D stages. Highly significant inter- and intragenotype relationships were found between the rate of photosynthetic electron transport to PS2 (Amax) and maximum fluorescence during actinic irradiation (Fm'). Also, each of the highly significant relationships between (Fm-Ft)F0 and Amax [(Fm-Ft)/F0] and deltaF/Fm', and between [(Fm-Ft)/F0] and Amax were represented by a general model, independent on treatments.
ISSN:0300-3604
1573-9058
DOI:10.1023/A:1006857412013