Histochemical evaluation of induction of somatic embryogenesis in Passiflora edulis Sims (Passifloraceae)

The aim of this study was to describe the accumulation of reserves during the somatic embryogenesis process in Passiflora edulis Sims FB-300, obtained from mature zygotic embryos, using histochemical methods. Mature zygotic embryos were inoculated in Murashige and Skoog induction media supplemented with 31.06 μM of picloram, 2.22 μM of benzyladenine, and 2.27 μM of thidiazuron. The zygotic embryo explants, at different developmental stages, were collected and fixed in Karnovsky solution and subsequently subjected to dehydration in an ethanol series and embedded in acrylic resin. Transverse and longitudinal sections (5-μm thick) were stained with toluidine blue for anatomical characterization, using Xylidine Ponceau for the detection of total protein, periodic acid-Schiff reagent for neutral polysaccharides, Sudan black B to detect lipids, and Lugol’s reagent for the starch detection. Histological sections revealed the formation of protuberances and globular stage somatic embryos in the cotyledonary region of the zygotic embryo. Histochemical tests revealed the presence of large quantities of protein bodies in zygotic embryos of P. edulis, which were gradually metabolized during somatic embryo development. Lipid bodies and starch grains were identified only after 20 d of culture, suggesting the use of these compounds as energy source for de novo synthesis. The present study describes the anatomical changes and the pattern of reserve accumulation during the somatic embryogenesis process in P. edulis

Germinação in vitro e organogênese direta em explantes hipocotiledonares com polaridade invertida de Psychotria ipecacuanha (Brot.) Stokes

Made available in DSpace on 2017-06-01T19:28:19Z (GMT). No. of bitstreams: 2 license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) 2.pdf: 1164681 bytes, checksum: aeb90d404899e63bad6f8b1eb5bf9634 (MD5) Previous issue date: 24Universidade do Estado de Mato Grosso. Departamento de Ciências Biológicas. Laboratório de Genética/Cultura de Tecidos Vegetais. Tangará da Serra, MT, Brasil.Universidade Federal de Viçosa. Departamento de Biologia Vegetal. Laboratório de Anatomia Vegetal. Viçosa, MG, Brasil.Universidade do Estado de Mato Grosso. Laboratório de Genética/Cultura de Tecidos Vegetais. Mestranda em Genética e Melhoramento de Plantas. Tangará da Serra, MT, Brasil.Universidade do Estado de Mato Grosso. Departamento de Ciências Biológicas. Laboratório de Genética/Cultura de Tecidos Vegetais. Tangará da Serra, MT, Brasil.Universidade do Estado de Mato Grosso. Departamento de Ciências Biológicas. Alta Floresta, MT, Brasil.Universidade Federal de Viçosa. Departamento de Biologia Vegetal. Laboratório de Cultura de Tecidos. Viçosa, MG, Brasil.Este trabalho visou à germinação e à regeneração adventícia in vitro de brotos a partir de hipocótilos invertidos de Psychotria ipecacuanha. Os resultados demonstraram um percentual de 84,17% de sementes germinadas com desenvolvimento normal das plântulas. A germinação iniciou-se após o segundo dia de cultivo sendo observada até aos 70 dias. Após 40 dias de cultivo foram obtidas plântulas com ± 10 cm, respondendo satisfatoriamente ao processo de aclimatização, sob condições de laboratório. Nos hipocótilos com polaridade invertida formaram-se brotos adventícios por via direta do tecido do explante, na região de contato com o meio de cultura, em vários estádios de desenvolvimento e na porção do hipocótilo fora de contato com o meio. A utilização de hipocótilos com a polaridade invertida ainda não foi reportada para a espécie. A organogênese ocorreu de forma direta nos explantes de P. ipecacuanha e a concentração de 1 mg L-1 BA favoreceu a indução de maior número de brotações adventícias. A análise anatômica dos brotos adventícios confirmou a origem dessas brotações por organogênese direta. Brotos adventícios alongados foram enraizados na presença de AIB. O maior percentual de enraizamento das brotações ocorreu na presença de 1,5 mg L-1 do regulador.This study aimed to seed germination and adventitious shoot regeneration from Psychotria ipecacuanha inverted hypocotyls. The results showed a percentage of 84.17% of seeds germinated with normal seedlings development. The germination started after the second day of cultivation and was observed up to 70 days. After 40 days seedlings were obtained with average 10 cm in length, responding satisfactorily to the process of acclimatization under laboratory conditions. In hypocotyls with inverted polarity adventitious shoots were formed directly from the explant tissue in the region of contact with the medium, and on the hypocotyl portion out of contact with the medium. The use of hypocotyls with inverted polarity has not been previously reported for the species. The organogenesis occurred directly in the explants and the BA at 1 mg L-1 enhanced the induction of greater number of adventitious shoots. Anatomical analysis confirmed the formation of adventitious shoots by direct pathway. Elongated adventitious shoots were rooted in the presence of IBA. The highest percentage of rooting shoots occurred in the presence of 1.5 mg L-1 of this growth regulator

Histochemical Evaluation Of Induction Of Somatic Embryogenesis In Passiflora Edulis Sims (passifloraceae)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)The aim of this study was to describe the accumulation of reserves during the somatic embryogenesis process in Passiflora edulis Sims FB-300, obtained from mature zygotic embryos, using histochemical methods. Mature zygotic embryos were inoculated in Murashige and Skoog induction media supplemented with 31.06 mu M of picloram, 2.22 mu M of benzyladenine, and 2.27 mu M of thidiazuron. The zygotic embryo explants, at different developmental stages, were collected and fixed in Karnovsky solution and subsequently subjected to dehydration in an ethanol series and embedded in acrylic resin. Transverse and longitudinal sections (5-mu m thick) were stained with toluidine blue for anatomical characterization, using Xylidine Ponceau for the detection of total protein, periodic acid-Schiff reagent for neutral polysaccharides, Sudan black B to detect lipids, and Lugol's reagent for the starch detection. Histological sections revealed the formation of protuberances and globular stage somatic embryos in the cotyledonary region of the zygotic embryo. Histochemical tests revealed the presence of large quantities of protein bodies in zygotic embryos of P. edulis, which were gradually metabolized during somatic embryo development. Lipid bodies and starch grains were identified only after 20 d of culture, suggesting the use of these compounds as energy source for de novo synthesis. The present study describes the anatomical changes and the pattern of reserve accumulation during the somatic embryogenesis process in P. edulis.515539545Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES