Reproductive biology and production of seeds and seedlings of Campomanesia pubescens (DC.) O. Berg.

Abstract

-Pollination is a fundamental process to produce food and maintain biodiversity in natural areas, since the production of seeds is related to its efficiency. Studies can determine the influence of reproductive systems on seed and seedlings quality and, consequently, on the structure of populations, helping the management, plant breeding and preservation of species. Campomanesia pubescens (DC.) O. Berg. (guabiroba) is a Brazilian shrub, pollinated by bees and occasionally by dipterans. This work aimed at evaluating the influence of pollination and reproductive system on seed production and germination and on the seedlings quality of C. pubescens. Phenology and floral biology were studied, and fruits from controlled pollinations were collected, in the Mogi Guaçu Biological Reserve, São Paulo State. The germination of seeds originated from self-and cross-pollination were analyzed, as well as the development of seedlings up to 180 days after germination. Seeds from selfpollination produced seedlings with lower development than the ones from cross-pollination, and they were more susceptible to mortality in laboratory and in greenhouse.Index terms: guabiroba, Myrtaceae, pollination, reproductive success.Biologia reprodutiva e produção de sementes e mudas de Campomanesia pubescens (DC.) O. Berg.RESUMO -A polinização é um processo fundamental para produção de alimentos e para a manutenção da biodiversidade em áreas naturais, já que influencia diretamente a produção de sementes. O estudo da influência dos sistemas reprodutivos na qualidade das sementes e mudas e, consequentemente, na estrutura de populações, pode auxiliar o manejo, o melhoramento genético e a conservação de espécies. Este trabalho teve como objetivo avaliar a influência da polinização e da reprodução sobre a produção e a qualidade de sementes e mudas de Campomanesia pubescens (DC.) O. Berg (guabiroba), arbusto nativo do Brasil, polinizado por abelhas e ocasionalmente por dípteros. Estudaram-se a fenologia e a biologia floral e coletaram-se frutos, oriundos de polinizações controladas, na Reserva Biológica de Mogi Guaçu, São Paulo. A germinação e a qualidade das sementes originadas de autopolinização e de polinização cruzada foram analisadas, bem como o desenvolvimento das mudas até 180 dias. As sementes oriundas de autopolinização deram origem a plântulas com desenvolvimento inferior às de polinização cruzada e mais susceptíveis a mortalidade tanto em laboratório quanto em casa de vegetação.Termos de indexação: guabiroba, Myrtaceae, polinização, sucesso reprodutivo.1

Pollination and quality of seeds and plantlets of Eugenia uniflora L.

“…Eugenia uniflora presents generalist flowers that offer pollen as the main attraction for pollinators. Its mass flowering pattern and the short duration of its flowers are common to other Myrtaceae species (Nic Lughadha & Proença 1996, Silva & Pinheiro 2007, Fidalgo & Kleinert 2009, Diniz & Buschini 2016, Rodrigues et al 2017. Silva & Pinheiro (2007) recorded the beginning of Eugenia uniflora flowering in the dry season, between August and October.…”

“…On the other hand, the development of only one new seedling in each seed fragment suggests the presence of a control system, with a balance between the stimulus to form a new seedling from the cut and the inhibition of the development of a second one (Amador & Barbedo 2011). One of the factors that can influence this process is the genetic control, as verified in Campomanesia pubescens, another species of the family (Rodrigues et al 2017).…”

Seed collection environment: Effects of forest cover reduction on biometrics and seed lot quality of Bowdichia virgilioides Kunth

“…O. Berg., seeds resulting from self-pollination provided seedlings with a lower development than cross-pollination, and were more susceptible to mortality (Rodrigues et al, 2017). Seeds from isolated matrices located in the open area resulted in a higher number of dead seeds and an increased formation of abnormal seedlings (non-viable seeds).…”