Artigo

Morphological criteria and temperature for evaluation of cupuassu seed germination

The objectives of this study were to determine the temperature range of Theobroma grandiflorum seed germination, to indicate the most suitable temperature for the germination test and propose morphological evaluation criteria to provide data for the inclusion of this species in the Brazilian Rules f...

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Autor principal: Ferraz, Isolde Dorothea Kossmann
Outros Autores: e Albuquerque, Maria Cristina de Figueiredo E., Calvi, Geangelo Petene, Farias, Derick de Lima
Grau: Artigo
Idioma: pt_BR
Publicado em: Revista Brasileira de Fruticultura 2020
Assuntos:
Theobroma
Theobroma Grandiflorum
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/16114
id oai:repositorio:1-16114
recordtype dspace
spelling oai:repositorio:1-16114 Morphological criteria and temperature for evaluation of cupuassu seed germination Critérios morfológicos e temperatura para avaliação da germinação dassementes de cupuaçu Ferraz, Isolde Dorothea Kossmann e Albuquerque, Maria Cristina de Figueiredo E. Calvi, Geangelo Petene Farias, Derick de Lima Theobroma Theobroma Grandiflorum The objectives of this study were to determine the temperature range of Theobroma grandiflorum seed germination, to indicate the most suitable temperature for the germination test and propose morphological evaluation criteria to provide data for the inclusion of this species in the Brazilian Rules for Seed Testing. The experiments were carried out in germination chambers with a 12 hour daily photoperiod, using vermiculite as substrate. Seed of T. grandiflorum were collected from the same population however of different trees at two occasions: February (lot 1) and April 2010 (lot 2). Seed germination was assessed at constant temperatures between 10 and 40°C, with an interval of 5°C. Three morphological criteria were evaluated: the protrusion (≥ 5 mm) of the first visible structure (physiological criterion), epicotyl length (≥ 3 cm; corresponding field emergence) and normal seedling development (technological criterion). The experimental design was completely randomized, with seven constant temperatures and four replicates with 25 seeds. For each criterion, germination percentage and variables of germination speed were assessed. In T. grandiflorum the hypocotyl is the first visible structure in the germination process. Its protrusion was observed between 10 and 40°C in seed lot 1 and, in seed lot 2, between 10 and 35°C. The lack of epicotyl growth and the development of normal seedlings at 10, 15 and 40°C, in both seed collections, indicate that the shoot is more sensitive to extreme temperatures than the hypocotyl and root. The lower temperature limit for shoot growth was between 15 and 20°C and the upper limit between 35 and 40°C. The temperature of 30°C is recommended for the germination test of T. grandiflorum. Observing normal seedling development, the first count could be done at day 21 and final count at day 35. Epicotyl length (≥ 3 cm) is suggested as an alternative for earlier assessment of seed germination, with the first count at day 14 and final count at day 20. 2020-05-24T21:49:08Z 2020-05-24T21:49:08Z 2012 Artigo https://repositorio.inpa.gov.br/handle/1/16114 10.1590/S0100-29452012000300033 pt_BR Volume 34, Número 3, Pags. 905-914 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Revista Brasileira de Fruticultura
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language pt_BR
topic Theobroma
Theobroma Grandiflorum
spellingShingle Theobroma
Theobroma Grandiflorum
Ferraz, Isolde Dorothea Kossmann
Morphological criteria and temperature for evaluation of cupuassu seed germination
topic_facet Theobroma
Theobroma Grandiflorum
description The objectives of this study were to determine the temperature range of Theobroma grandiflorum seed germination, to indicate the most suitable temperature for the germination test and propose morphological evaluation criteria to provide data for the inclusion of this species in the Brazilian Rules for Seed Testing. The experiments were carried out in germination chambers with a 12 hour daily photoperiod, using vermiculite as substrate. Seed of T. grandiflorum were collected from the same population however of different trees at two occasions: February (lot 1) and April 2010 (lot 2). Seed germination was assessed at constant temperatures between 10 and 40°C, with an interval of 5°C. Three morphological criteria were evaluated: the protrusion (≥ 5 mm) of the first visible structure (physiological criterion), epicotyl length (≥ 3 cm; corresponding field emergence) and normal seedling development (technological criterion). The experimental design was completely randomized, with seven constant temperatures and four replicates with 25 seeds. For each criterion, germination percentage and variables of germination speed were assessed. In T. grandiflorum the hypocotyl is the first visible structure in the germination process. Its protrusion was observed between 10 and 40°C in seed lot 1 and, in seed lot 2, between 10 and 35°C. The lack of epicotyl growth and the development of normal seedlings at 10, 15 and 40°C, in both seed collections, indicate that the shoot is more sensitive to extreme temperatures than the hypocotyl and root. The lower temperature limit for shoot growth was between 15 and 20°C and the upper limit between 35 and 40°C. The temperature of 30°C is recommended for the germination test of T. grandiflorum. Observing normal seedling development, the first count could be done at day 21 and final count at day 35. Epicotyl length (≥ 3 cm) is suggested as an alternative for earlier assessment of seed germination, with the first count at day 14 and final count at day 20.
format Artigo
author Ferraz, Isolde Dorothea Kossmann
author2 e Albuquerque, Maria Cristina de Figueiredo E.
Calvi, Geangelo Petene
Farias, Derick de Lima
author2Str e Albuquerque, Maria Cristina de Figueiredo E.
Calvi, Geangelo Petene
Farias, Derick de Lima
title Morphological criteria and temperature for evaluation of cupuassu seed germination
title_short Morphological criteria and temperature for evaluation of cupuassu seed germination
title_full Morphological criteria and temperature for evaluation of cupuassu seed germination
title_fullStr Morphological criteria and temperature for evaluation of cupuassu seed germination
title_full_unstemmed Morphological criteria and temperature for evaluation of cupuassu seed germination
title_sort morphological criteria and temperature for evaluation of cupuassu seed germination
publisher Revista Brasileira de Fruticultura
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/16114
_version_ 1787143920972464128
score 11.755432

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