Name: Thaís Araujo dos Santos Gasparini
Type: PhD thesis
Publication date: 14/02/2020
Advisor:
Name |
Role |
|---|---|
| CAMILLA ZANOTTI GALLON | Co-advisor * |
| Diolina Moura Silva | Advisor * |
| Pedro Corrêa Damasceno Junior | Co-advisor * |
Examining board:
| Name |
Role |
|---|---|
| Alexandre Martins Costa Santos | External Examiner * |
| Diolina Moura Silva | Advisor * |
| Fábio Luiz Partelli | External Alternate * |
| Jose Aires Ventura (M/D) | Internal Examiner * |
| Pedro Corrêa Damasceno Junior | Internal Examiner * |
| Silvia Tamie Matsumoto | Internal Alternate * |
| Wagner Luiz Araujo | External Examiner * |
Summary: Jatropha curcas L. is a species of the Euphorbiaceae family, originally from the
American continent, whose cultivation has been disseminated in several regions of the globe, predominantly in tropical regions. Due to the rusticity, adaptability to various environments and the quality of the oil, this plant, in addition to having potential as a source of biodiesel, can also be used in the recovery of degraded areas, in addition to uses in pharmacology. Water stress, together with high temperatures, can lead to biochemical and physiological changes that vary from photosynthetic yield to solute accumulation, also limiting plant productivity. It is known that the tolerance of plants to stressful conditions can be attributed to the degree of adaptation of these plants to the environmental conditions of cultivation sites. Therefore, it was realized the need to screen the physic nut accessions quickly and efficiently. The objective of this work was to differentiate the accessions of J. curcas regarding the degree of sensitivity to heat through the index of sensitivity to heat. It was also verified the interference of drought and sensitivity to heat, in addition to the study of antioxidant metabolism and production of osmoprotectors. Clear differences were observed in the parameter PIABS and its components (RC/ABS, φP0 and ΨE0), therefore, we can consider that the categories of thermal response of jatropha access plants were clearly differentiated: sensitive NEF12, NEF05 and NEF16 tolerant. The relative decreases in PIABS and PITOTAL were variable for accessions cultivated at high temperature and tested under water deficit, allowing the selection of accessions according to the demonstrated sensitivity: less sensitive (NEF07) and sensitive (NEF05). The enzymatic activity of CAT and APX, carbohydrates, pigments and proline accumulation demonstrated that the accessions have different responses
to the same stress.
