Substrates and temperatures in the germination of Eriotheca gracilipes
            seeds

Melo, Paulo Alexandre Fernandes Rodrigues de; Cavalcanti, Maria Idaline Pessoa; Alves, Edna Ursulino; Martins, Cibele Chalita; Araújo, Luciana Rodrigues de

doi:10.5935/1806-6690.20170035

Cited by 8 publications

(13 citation statements)

References 16 publications

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“…Based on these results, it can be inferred that the substrate and the temperature influence in the seed germination, because, to start this process, seeds undergo metabolic reactions that involve the activation of enzymes, hydrolysis, assimilation and mobilization of the reserves, and cell division (Melo et al, 2017). Thus, in addition to the physiological activities that vary according to the initial seed quality (Mbofung et al, 2013), the substrate structure, its water retention capacity, aeration and temperature adequacy also contribute to a higher germination percentage (Silva et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…Rubra (Tables 1 and 2), is not only due the proper combination between this substrate and temperature, but also to seed characteristics, such as thickness and tegument composition. While the sand does not maintain satisfactory level of humidity at high temperatures, it has a better efficiency in moderate thermal oscillations, since it presents uneven water retention and distribution, leaving the upper part dry (Melo et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

“…The results of germination tests are useful to determine the rate of seedling production. However, for almost all native species, the test methodology is not yet established due to factors such as substrate and temperature (Melo et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…For the tropical and subtropical Brazilian plant species, the optimal temperature is between 20 and 35 ºC, since these temperatures are the ones observed in the regions of origin of the plants, at the correct time for natural germination (Melo et al, 2017). In addition to substrate and temperature, germination is also affected by structure, air space, water retention capacity and other factors that may influence seed germination.…”

Section: Introductionmentioning

confidence: 99%

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Substrates and Temperatures in the Germination of Hibiscus sabdariffa L. Seeds

Gomes¹,

Bruno²,

Melo³

et al. 2018

JAS

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Vegetable biodiversity in Brazil accounts for almost 67% of the plants on the planet, which are part of studies with focus on determinants of food security and access to adequate and healthy food, while preserving natural resources. Studies indicate that Hibiscus sabdariffa L. is one of the most studied unconventional food crops because of its nutraceutical quality as antioxidant and prevention of hypertension and cancer. Although relevant, substrate and temperature information for seedling production of this species are scarce. Thus, the aim of this study was to evaluate the best substrate and temperature for the vigor and germination test of H. sabdariffa seeds of the Talo Roxo and Rubra varieties. The experiment was laid out in a randomized complete design, in a 7 × 5 factorial arrangement, consisting of the combinations of seven substrates (paper towel, filter paper, vermiculite, between sand, on sand, plantmax® and compost) with five temperatures (20, 25, 30, 35 and 20-30 °C), with four replicates with 50 seeds each. The following variables were evaluated: germination, germination speed index, seedling length and dry mass. For germination and vigor tests of Hibiscus sabdariffa var. Talo Roxo seeds the paper roll substrate is recommended at temperatures of 25 or 35 °C and for var. Rubra seeds, plantmax® at 25 °C and plantmax® and vermiculite at temperatures of 25 or 20-30 °C, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Substrates and Temperatures in the Germination of Hibiscus sabdariffa L. Seeds

Gomes¹,

Bruno²,

Melo³

et al. 2018

JAS

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“…Gonçalves et al (2010) report these evidences, as a possible evolutionary adaptation in the use of the organic matter by E. oleracea palm trees that grow in flooded habitat, because they accumulate more carbohydrates in the seeds. In addition to the physiological activities that vary, initial seed quality, substrate structure, water retention capacity and soil aeration also contribute to increased seedling emergence uniformity and speed (Melo et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Emergence and Initial Growth of the Seedlings of Euterpe oleracea Mart. Seeds of Different Ecotypes in Function on the Substrate

Silva¹,

Melo²,

Araújo³

et al. 2018

JAS

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In Brazil, the assai (Euterpe oleracea Mart.) is a native palm of the Amazon biome, being exploited in an extractive and predatory way to obtain palm heart and processed pulp. In recent years, there has been an increase in the exploitation of commercial plantations in the country, since extractivism and management of native areas are not able to meet growing demand. In this way, companies of the sector and public institutions have invested in new technologies, such as the improvement of plants, which has increased the demand for good quality seeds, coming from natural ecotypes. Thus, the objective of this work was to evaluate seeds of E. oleracea from three ecotypes regarding the emergence and initial growth of the seedlings in different substrates to guide future plant selection. Seed lots from three assai berry ecotypes were evaluated for water content, seedling emergence, first count, seedling emergence speed index, seedling length and dry mass. The experimental design was completely randomized, with four repetitions of 50 seeds, sown on different substrates. In the physiological characteristics of the seeds and seedlings, there are differences of the three E. oleracea ecotypes. These ecotypes make it possible to identify and select assai palm’s mother plants of Luiz Domingues (IG) and Maracanã (V) natives of areas of the igapó and várzea, respectively, as producers of better quality seeds and seedlings in an alternative substrate (composed of sand, agricultural soil and cattle manure in a proportion of 2:2:1) and, commercial substrate (FORTH® compound of pinus and gray bark), respectively.

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Substrate, moisture, temperature and seed germination of the threatened endemic tree Eriotheca vargasii (Malvaceae)

Mamani¹,

Chuquillanqui

Chumbiauca

et al. 2018

RBT

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We studied the germination of Eriotheca vargasii (Malvaceae), a poorly known endemic Peruvian Andean tree species characteristic of the dry forests of the Torobamba river valley. We determined seed characteristics, embryo morphology, viability, and assessed the influence of substrate (natural soil and commercially prepared media), temperature (controlled at 25 ºC and at ambient temperature between 18-22 ºC), and moisture (25 % and 50 % field capacity) on seed germination. Although most seeds were ovoid in shape and contained well-developed embryos, only 46% of them were viable. Substrate moisture levels had no influence on germination capacity or rate. In contrast, temperature and substrate type showed strong effects on germination. We observed the highest proportion of germinated seeds in prepared media at both temperatures tested (> 61 %). Furthermore, substrate types also influenced germination rates, with lower values in natural soil. The strongest effect on germination rates was by temperature, enhancing the difference in responses in substrate types. The low proportion of germinated seeds in soil (< 39 %), together with external local stress factors (e.g. grazing impact by herbivores), may be the critical factors contributing to the nearly total absence of seedlings and saplings of E. vargasii in the study area despite abundant seed production.

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Substrates and temperatures in the germination of Eriotheca gracilipes seeds

Abstract: Substrates and temperatures in the germination of

Cited by 8 publications

References 16 publications

Substrates and Temperatures in the Germination of Hibiscus sabdariffa L. Seeds

Substrates and Temperatures in the Germination of Hibiscus sabdariffa L. Seeds

Emergence and Initial Growth of the Seedlings of Euterpe oleracea Mart. Seeds of Different Ecotypes in Function on the Substrate

Substrate, moisture, temperature and seed germination of the threatened endemic tree Eriotheca vargasii (Malvaceae)

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