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Thermal requirements and germination niche breadth of Polygonum ferrugineum Wedd. from southeastern Brazil

Published online by Cambridge University Press:  30 April 2021

Andréa R. Marques Open the ORCID record for Andréa R. Marques [Opens in a new window] ,
Ana Letícia B. R. Gonçalves ,
Fábio S. Santos ,
Diego Batlla ,
Roberto Benech-Arnold  and
Queila S. Garcia
Andréa R. Marques*
Affiliation:
Departamento de Ciências Biológicas, CEFET/MG, Av. Amazonas, 5253, Nova Suíça, 30480000, Belo Horizonte, Minas Gerais, Brazil
Ana Letícia B. R. Gonçalves
Affiliation:
Departamento de Ciências Biológicas, CEFET/MG, Av. Amazonas, 5253, Nova Suíça, 30480000, Belo Horizonte, Minas Gerais, Brazil
Fábio S. Santos
Affiliation:
Departamento de Ciências Biológicas, CEFET/MG, Av. Amazonas, 5253, Nova Suíça, 30480000, Belo Horizonte, Minas Gerais, Brazil
Diego Batlla
Affiliation:
IFEVA/Cátedra de Cerealicultura, CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE, Buenos Aires, Argentina
Roberto Benech-Arnold
Affiliation:
IFEVA/Cátedra de Cerealicultura, CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE, Buenos Aires, Argentina
Queila S. Garcia
Affiliation:
Departamento de Botânica, ICB/UFMG, Av. Antônio Carlos, 6627, Pampulha, 31270110, Belo Horizonte, Minas Gerais, Brazil
*
Author for Correspondence: Andréa R. Marques, E-mail: [email protected]
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Abstract

Temperature may regulate seed dormancy and germination and determine the geographical distribution of species. The present study investigated the thermal limits for seed germination of Polygonum ferrugineum (Polygonaceae), an aquatic emergent herb distributed throughout tropical and subtropical America. Seed germination responses to light and temperature were evaluated both before (control) and after stratification at 10, 15 and 20°C for 7, 14 and 28 d. Germination of control seeds was ~50% at 10 and 15°C, and they did not germinate from 20 to 30°C. The best stratification treatment was 7 d at 10°C, where seed germination was >76% in the dark for all temperatures, except at 30°C, and < 60% in light conditions. A thermal time approach was applied to the seed germination results. Base temperature (Tb) was 6.3°C for non-dormant seeds and optimal temperature (To) was 20.6°C, ceiling temperature (Tc (<50)) was 32.8°C, and thermal time requirement for 50% germination was 44.4°Cd. We concluded that a fraction of P. ferrugineum seeds is dormant, has a narrow thermal niche to germinate (10 and 15°C) and that cold stratification (10°C) alleviated dormancy and amplified the thermal range permissive for germination of the species. Consequently, P. ferrugineum is expected to occur in colder environments, for example, at high altitudes. Higher temperatures decrease the probabilities of alleviate dormancy and the ability of their seeds to germinate.

Keywords

base temperaturegermination nichePolygonaceaeseed dormancystratificationthermal time requirement
Type
Research Paper
Information
Seed Science Research , Volume 31 , Issue 2 , June 2021 , pp. 91 - 97
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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