Name: TATIANE APARECIDA ZORZAL SEIDEL
Type: PhD thesis
Publication date: 11/09/2019
Advisor:
Name |
Role |
|---|---|
| Geraldo Rogério Faustini Cuzzuol | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| Camilla Rozindo Dias Milanez | Internal Examiner * |
| CARLOS ALBERTO SPAGGIARI DE SOUZA | Co advisor * |
| Diolina Moura Silva | Internal Examiner * |
| Geraldo Rogério Faustini Cuzzuol | Advisor * |
| LEONARDO VALANDRO ZANETTI | External Alternate * |
| MARCOS THIAGO GAUDIO GOMES | External Examiner * |
| Sara Dousseau Arantes | External Examiner * |
| Viviana Borges Corte | Internal Alternate * |
Summary: ABSTRACT
ACTING OF SOLAR RADIATION GRADIENTS ON PLANT PHYSIOLOGY
AND BIOCHEMISTRY AND PHYSICAL CHARACTERIZATION OF FRUIT
AND SEED QUALITY OF TWO GENOTYPES OF Theobroma cacao L.
(MALVACEAE)
The cultivation of cacao (Theobroma cacao L.) in environments with little or no
shade has gained prominence for increasing productivity in relation to cultivation
in shaded environments. Cocoa is considered one of the most important
perennial crops in the world because its seeds are the raw material for the
production of chocolate, one of the most consumed foods in the world. However,
studies with cacao plants exposed to full sun, study their physiological and
biochemical behavior only when young, in their initial growth, there are no studies
that evaluate the physiological and biochemical modifications of adult cacao
plants, as well as the analysis of fruits and seeds formed under different
conditions of solar radiation. In the present work, physiological and biochemical
changes caused by different levels of solar radiation (100% full sun, 70%, 50%
and 20%), in winter and summer, were evaluated in adult plants of two cacao
genotypes. PH 16 and IPIRANGA 01, both resistant to witch's broom. It was also
evaluated how the different levels of solar radiation (100% full sun, 70% and 50%)
affect the physical characteristics of the fruits, as well as the seed quality. Plants
of genotype PH 16 exhibited better performance under conditions of 100% solar
radiation. The IPIRANGA 01 genotype showed behavioral variations, however
such variations did not cause damage that prevented the development and
maintenance of the plants, which allowed the adjustment and acclimation of the
plants. Thus, both genotypes studied were able to acclimate to the different light
levels studied. The fruits of the genotype PH 16, besides showing a higher yield
of seeds and pulp when cultivated in full sun, also showed a higher yield, the
seeds of this genotype in full sun exhibited characteristics favorable to the
production of quality chocolates. The fruits of the IPIRANGA 01 genotype did not
exhibit a higher yield in full sun when compared mainly to 50% of solar radiation,
however in full sun the yield was higher than in the other treatments. Thus, full
sun cultivation is indicated for the increase of cacao production and at the same
time to obtain seed quality standards.
Keywords: Cocoa, Photosynthesis, Solar radiation, Pigments, Carbohydrates,
Seeds, Quality.
