Propagação sexuada e assexuada de São-João-Caá (Unxia camphorata, L.F.)

Abstract

Abstract 1:The present work proposed to development viable methods the propagation species Unxia camphorata L.F., known vulgarly as São-joão-caá. Aspects physical and physiologic were evaluated of the seeds germination after the storage periods and the propagation stakes in different substratum and concentrations of indolbutiric acid (AIB). For much, the researches were directed for break dormancy made through of chemical scarification with sulfuric acid and use of giberelic acid, for the study of viability of seeds after the storage period was determinated the humidity degree, the imbibition curve and germination in differents substrata, through the result obtained concluded: that the majority of seeds of São-joão-caá, presented dormancy didn't overcome for the treatment applied, that this dormancy not is because the impermeability of the tegument, that the seeds were maintained viable for one period of five months, and that best results of germination were in the sand and coconut fiber subtrata. Other directly of the research was for the study of the process of unisexual propagation for this specie, through of evaluating of the acid indolbutiric effect and different subtrata in the rooting of herbs stakes, with these studies concluded to be possible propagate the specie via rooting of herbs stakes, for among the used substrata, that was presented best results was the sand + rice straw carbonized + soil with or without apply of AIB.

Abstract 2: The São-joão-caá {Unxia camphorata L.F Asteraceae) is one herb of natural occurrence in the Amazon with medicinal and aromatic potential, however, little research were carried out in the sense of obtain a larger knowledge for the respect of this herb. In this sense, the purpose of this work is to evaluate the seeds germination of São-joão-caá under the physic and physiologic point of view. As much were carried out the next studies: the Io study was directed for to promote the dormancy break, submitted the seeds the chemical scarification with sulfuric acid (H2SO4) in periods of 5, 10 and 15 minutes and to follow were submitted for two concentrations of giberelic acid (Ag3) (lOOmg"1 and SOOmg"1) under two forms of use, such study was carried out in factorial scheme 3x2x2 through a split plot experimental design with four repetitions of 25 seed for pareci. In the 2o study were conducted essays for humidity determination, imbibition curve and seeds germination in different substrata of sand, coconut fiber, vermiculita and terriço. In the final of such studies were verified that for the dormancy break didn't have significant results, little seeds germinated with twenty nine days, being that the majority presented dormancy that delayed the germination; in the next study confirmed that the dormancy of seed didn't have overcame and because the impermeability of tegument, for the water absorption was more large in seed that had store period more prolongate, and yet, that the seed presented to tolerate store periods of five months were maintained viable, germinated with low content of humidity in the substrata: sand and coconut fiber.

Abstract 3: São-João-Caá {Unxia camphorata L.F Asteraceae), is a herb of natural occurrence in the region of fields in the north of Brazil and in the Guianas, prolongateed until the Panamá. This specie is much used for the traditional populations of the region, because its effects digestive proprieties among others, has potential to essential oil production. The objective of the work was developed a vegetative propagation system and to evaluate the IBA and different substrata in the rooting of stem herbs. For this were installed two experiment: in the Io were evaluate ten substrata in two concentrations of AIB and in the 2o were evaluated four concentrations of AIB in two subtstrata. The experiments were installed in the delineate factorial in split plot with four replications and parcels of four stems. The stems were rooting in tubets and greenhouse with intermittent nebulization, by sixty days, and were evaluated as the percentages rooting, length of the longest root, weight of root dry matter, buds and leafs numbers by stems. It was concluded to be possible to propagate the concentrations of AIB, the use of sand + sand + rice straw carbonized + soil, with and without applied of 2000 mg "1 of AIB it was recommended.