Aspectos da germinação de sementes, da emergência de plântulas e da morfologia dos frutos e sementes de Campomanesia pubescens (DC.) O. Berg (myrtaceae)

• Autor(a) principal: Periotto, Fernando
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFSCAR
• Texto Completo: https://repositorio.ufscar.br/handle/ufscar/1633
• topic: Germinação; Morfologia - sementes; Mudas; Campomanesia pubescens; Plântulas; Seeds; Seedlings; Growth; CIENCIAS BIOLOGICAS::ECOLOGIA

Campomanesia pubescens (D.C.) O. Berg., found in Minas Gerais, Goias and the Espirito Santo to Rio Grande do Sul, is a fruitful Myrtaceae whose gender has 25 species distributed from Mexico to Argentina and 15 of them natives of Brazil. Their seeds need of technical and scientific studies that could clarify their ecological characteristics, morphological and physiological, thus contributing to a better understanding. To this end, the objective of this study was to investigate aspects of the germination of seeds, seedlings, the emergence and the basic morphology of seeds of this species under different conditions in the laboratory and in a greenhouse. Their seeds have dimensions between 4.5 to 7.5 mm in length and 2.8 to 6.5 mm wide, the larvae infestation reached 8.92% of the fruits collected, the average number of seeds per fruit were extracted 6 And it was these seeds 38.45% and 61.55% empty seed floods. The water content found in its seeds was 53.5%, and in the curve of soaking, the protruding root occurred at 144 days, when the initial value was increased by 18.4% to mass on the mass of matter fresh start. It was observed that the final percentage and speed emergency seedlings was promoted significantly in substrates: coconut fiber / vermiculite (2:1) and vermiculite. In seedlings, the coconut fiber substrates / vermiculite (2:1), sand and vermiculite provided superior results to their lengths, as opposed to those that grew on the substrate of coconut fiber, which have significantly smaller lengths. Regarding the number of leaves per plant, there was no significant difference found between those who grew up in four different substrates. After 120 days of sowing, vermiculite, coconut fibre / vermiculite (2:1) and coconut fibre the percentage of 100% survival of seedlings as the substrate sand because his physical resistance offered to the emergence of seedlings, caused the loss of paracotilédones thus reducing the survival end to 90%. Looking at the mass of dry seedlings, roots, stems and leaves growing in coconut fiber substrates / vermiculite (2:1), vermiculite and sand had earned significantly higher in dry matter, with the weight of dry matter roots was higher against the portions of the air in all substrates studied: (0.12 g) greater weight of dry matter of roots, (0.02 grams) of the largest mass of stems and dry (0.03 g) greater weight of dry matter of leaves, consecutively, in seedlings that are developed in substrates vermiculite and sand. The germination (%) was significantly damaged at 40oC and water stress. When dried, fermented for 24 hours or for 4 days, 100% of the seed tested completely lost the ability germination. The results were as conductivity of the average value of 13.7 μ S.cm- 1.g-1 the rapid ageing significantly disrupted the proceedings of the seed germination.