Influence of seed size on germination and vigor of seedlings of Camu-Camu

Abstract

ResumoO camu-camu (Myrciaria dubia) é uma espécie frutífera nativa da Amazônia e sua importância econômica é comprovada devido ao fruto conter elevado teor de ácido ascórbico. O trabalho foi realizado com objetivo de avaliar a germinação e vigor de plântulas obtidas de sementes de diferentes tamanhos de duas populações de camu-camu. O delineamento experimental utilizado foi o inteiramente casualizado em esquema fatorial de 2 x 3 (duas procedências: rio Anauá e rio Urubu e três tamanhos de sementes: pequeno, médio e grande) com 5 repetições de 20 sementes por parcela. As sementes da procedência do rio Anauá, apresentaram maior massa (1,46 g) comparada com a procedência do rio Urubu (0,78 g). O percentual de emergência e velocidade de emergência de plântulas apresentaram melhores valores para a população do rio Anauá, justificando-se a adoção de escolha de procedência para a formação de mudas. Para comprimento do sistema radicular, massa seca da parte aérea e massa seca do sistema radicular, as sementes classificadas como média e grande oriundas do rio Anauá apresentaram maiores valores. As classes de massa das sementes apresentam um caractere importante para ser utilizado na produção de mudas de Myrciaria dubia. As sementes da procedência do rio Anauá são potencialmente mais vigorosas sendo indicadas para a produção de mudas de camu-camu (Myrciaria dubia).Palavras chave: Myrciaria dubia; caracteres morfológicos; produção de mudas; massa de semente; propagação sexuada. AbstractCamu-camu (Myrciaria dubia) is a fruit species native to the Amazon and its economic importance is proven because the fruit contains high content of ascorbic acid. The objective of this work was to evaluate the germination and vigor of seedlings obtained from seeds of different sizes of two camu-camu populations. The experimental design was completely randomized in a factorial scheme of 2 x 3 (two provenances river Anauá and river Urubu and three seed sizes, small, medium and large) with 5 replicates of 20 seeds per plot. The seeds of the origin of the Anauá river presented higher mass (1.46 g) compared to the origin of the Urubu river (0.78 g). The speed and emergence of seed germination presented better values for the population of the Anauá river, justifying the adoption of choice of origin for the formation of seedlings. For root length, dry shoot mass and dry mass of the root system, the seeds classified as medium and large originated from the Anauá river presented higher values. The size of the seeds is an important character to be used in the production of Myrciaria dubia seedlings. The seeds of the origin of the Anauá river are potentially more vigorous are indicate for the production of camu-camu (Myrciaria dubia) seedlings.

PERMEABILITY TO WATER AND VIABILITY IN HETEROMORPHIC COLOR SEEDS OF Bowdichia Virgilioides KUNTH

“…In Myrciaria dubia (H.B.K.) McVaugh, dark brown seeds germinated less compared to mixed and green seeds (Yuyama and Silva Filho, 2003). In contrast, dark brown seeds of Sebastiania commersoniana (Baill.)…”

Do storage of Eugenia stipitata seeds affect their germination and efficacy of the tetrazolium viability test?

“…This is why obtaining information on seed tolerance to drying relative to germination power is of great importance, since the germination test is the most-used official parameter to evaluate the physiological quality of seed batches (Souza et al, 2017;Menegatti et al, 2019;Smiderle et al, 2021). The above authors, however, attributed serious limitations to the germination test.…”

Organic substrates in the development of camu-camuzeiro (Myrciaria dubia (H. B. K.) McVaugh) in the amazon region

“…Chestnut shell + Poultry manure), T7 (Humus + Chestnut shell + Bovine manure), and T8 (Humus + Açaí kernel + Poultry manure) treatments with an average number of leaves of 50.9 (Figure1C).The best means for the seedlings root length were from the treatments with Humus (T1), Humus + Poultry manure (T2), Humus + Chestnut shell (T5), Humus + Bovine manure + Chestnut shell (T7), Humus + Açaí kernel + Poultry manure (T8), Humus + Açaí kernel + Bovine manure (T9) and the Commercial one (T10) (Figure1D) Souza et al, (2017),. studied the influence of seed size on the vigor of seedlings of camu-camuzeiro populations cultivated in the commercial substrate,…”