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Seed dormancy of Lolium perenne L. related to the maternal environment during seed filling

Published online by Cambridge University Press:  15 July 2021

Rodrigo Fernández ,
Guillermo R. Chantre  and
Juan P. Renzi Open the ORCID record for Juan P. Renzi [Opens in a new window]
Rodrigo Fernández
Affiliation:
Instituto Nacional de Semillas, 8000 Bahía Blanca, Argentina
Guillermo R. Chantre
Affiliation:
Departamento de Agronomía, Universidad Nacional del Sur, San Andrés 800, Altos de Palihue, 8000 Bahía Blanca, Argentina Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS-CONICET), 8000 Bahía Blanca, Argentina
Juan P. Renzi*
Affiliation:
Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS-CONICET), 8000 Bahía Blanca, Argentina Instituto Nacional de Tecnología Agropecuaria, 8142 Hilario Ascasubi, Argentina
*
Author for Correspondence: Juan P. Renzi, E-mail: [email protected]
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Abstract

Lolium perenne L. (perennial ryegrass) shows variable levels of seed physiological dormancy (PD), which depends on the genotype and environmental condition during seed development. To analyse the effect of field temperature and precipitation during seed filling on the PD, two cultivars were sown on five dates in 2014 and 2015. After harvest, the level of seed PD was 4–28%. High-temperature stress (>29°C) in the field during seed development, measured as heat stress units (HSUs), reduced seed PD (increased germination) at harvest. After 9 months of dry afterripening under laboratory conditions, mean dormant seed values were reduced from 15 ± 8 to 8 ± 7%. An increment in the seed PD level reduced seedling emergence in the field. Seed with 20% PD produced only 50% of field emergence, under optimal environmental conditions. Different vigour tests were conducted and each was compared with field emergence. The speed of germination, through the first count at 5 d of the standard germination test, and the shoot length at 10 d were better associated with the seedling establishment in the field. The HSU could be useful to establish a possible PD range in the seed of perennial ryegrass after the growing season. The development of models considering the HSU and other climatic parameters could motivate future studies.

Keywords

dormancyfield emergenceheat stressperennial ryegrassseed filling
Type
Research Paper
Information
Seed Science Research , Volume 31 , Issue 3 , September 2021 , pp. 217 - 223
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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