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Maturação Fisiológica, Tolerância À Dessecação E Conservação De Sementes De Lauráceas Da Mata De Araucária De Santa Catarina
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hirano, Elcio Shiyoti |
| Copyright Year | 2012 |
| Abstract | Recalcitrant seeds of canela fogo (Cryptocaria aschersoniana), canela guaica (Ocotea puberula), canela imbuia (Nectandra megapotamica), canela sassafras (Ocotea odorifera) and imbuia (Ocotea porosa), offers difficulties for collection because of great height of trees and if collected on the ground after the natural fall they have fast deterioration by insects, the not uniformity of maturation of the fruits make necessary several interventions of collection of seeds in donor trees, sometimes placed at points of uneasy access. The conservation of the seed is difficult because of high moisture content, the intolerance for desiccation and low viability period. This research work was divided in three parts, the first is determining if the color of fruit may serve as an indicator of physiologic maturation of seed with the purpose of making possible the collection directly from the tree without the need of awaiting for the maturation of the fruit. The second part was to verify the conservation of the seed in three types of storage; cold chamber, refrigerator and natural room condition, if it could increase the viability period. The third part had as objective to determine the critical and lethal moisture level of the seed, with the purpose of making possible the moisture reduction without viability loss in order to make possible to increase the viability period, with the reduction of attack of disease and biological activity. The seeds of the five species were collected in the area of north of Santa Catarina State, latitude 26 10' 38" S, longitude 50 23' 24" W and average altitude 800 m. In the first part the results showed that for all studied the seeds from green fruits presents germination, but for Ocotea odorifera must be collected with bellow of 57,3% of seed moisture, for Ocotea porosa bellow of 63,2% and for Ocotea puberula between 34,1% to 40,2% of seed moisture. For Ocotea porosa, Ocotea puberula and Nectandra megapotamica the green fruits suffer less insect damage in seeds than ripen and fallen fruits. In the second part, the conservation of the seeds wrapped in plastic sacks of 0,05 mm and 8 holes of 0,2 cm of diameter in the five studied species, for all species studied the cold chamber with temperature of 4 C and 85% RU showed longer conservation period. Following by storage in refrigerator with 10 C and 60% RU, and the worse conservation was at ordinary room condition with variable temperatures and moisture with average of 22 C and 68% RU respectively. The Ocotea odorifera maintained the viability up to 136 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://acervodigital.ufpr.br/bitstream/handle/1884/2271/elcio.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
