Dormancy, germination and emergence of Urochloa panicoides regulated by temperature
Urochloa panicoides is an annual weed of summer crops. In Argentina, in subhumid areas with monsoon rainfall, it germinates and establishes in a single flush. To (i) identify the environmental factors that modify its seed dormancy level and germination and (ii) quantify the parameters describing the thermal behaviour of the germination and emergence dynamics of this weed under non - limiting water conditions, we established a set of germination experiments performed (i) under controlled conditions using seeds after ripened for 3 or 6 months in different thermal and hydric conditions and (ii) under field conditions, where the soil temperature was modified by applying different shading levels. Seed dormancy level remained high with 3 months after ripening in all treatments. After 6 months, seeds stored at 4°C in dry conditions did not germinate at any temperature, while seeds stored at 25°C in dry conditions and in situ germinated c. 20 per cent and 60 per cent respectively. Germination percentage was higher in seeds harvested before their natural dispersal. The base, optimum and maximum temperatures for seed germination were 6, 35 and 45°C respectively. Shading reduced the number of emerged seedlings, possibly by reducing the soil thermal amplitude. The results explained the dormancy - breaking mechanism of U. panicoides that allows a high germination rate in the field when rainfall occurs.
Main Authors: | , , , |
---|---|
Format: | info:eu-repo/semantics/article biblioteca |
Language: | eng |
Subjects: | LIVER SEED GRASS, AFTER RIPENING CONDITION, BASE TEMPERATURE, DORMANCY RELEASE, THERMAL AMPLITUDE, THERMAL TIME, |
Online Access: | http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2016ustarroz |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
snrd:2016ustarroz |
---|---|
record_format |
koha |
spelling |
snrd:2016ustarroz2021-10-15T16:56:07Z Ustarroz, D. Kruk, B. C. Satorre, E. H. Ghersa, C. M. 2016 Urochloa panicoides is an annual weed of summer crops. In Argentina, in subhumid areas with monsoon rainfall, it germinates and establishes in a single flush. To (i) identify the environmental factors that modify its seed dormancy level and germination and (ii) quantify the parameters describing the thermal behaviour of the germination and emergence dynamics of this weed under non - limiting water conditions, we established a set of germination experiments performed (i) under controlled conditions using seeds after ripened for 3 or 6 months in different thermal and hydric conditions and (ii) under field conditions, where the soil temperature was modified by applying different shading levels. Seed dormancy level remained high with 3 months after ripening in all treatments. After 6 months, seeds stored at 4°C in dry conditions did not germinate at any temperature, while seeds stored at 25°C in dry conditions and in situ germinated c. 20 per cent and 60 per cent respectively. Germination percentage was higher in seeds harvested before their natural dispersal. The base, optimum and maximum temperatures for seed germination were 6, 35 and 45°C respectively. Shading reduced the number of emerged seedlings, possibly by reducing the soil thermal amplitude. The results explained the dormancy - breaking mechanism of U. panicoides that allows a high germination rate in the field when rainfall occurs. application/pdf 10.1111/wre.12181 1365-3180 http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2016ustarroz eng info:eu-repo/semantics/openAccess openAccess http://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section4 Weed research Vol.56 59-68 http://onlinelibrary.wiley.com LIVER SEED GRASS AFTER RIPENING CONDITION BASE TEMPERATURE DORMANCY RELEASE THERMAL AMPLITUDE THERMAL TIME Dormancy, germination and emergence of Urochloa panicoides regulated by temperature info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion publishedVersion |
institution |
UBA |
collection |
DSpace |
country |
Argentina |
countrycode |
AR |
component |
Bibliográfico |
access |
En linea |
databasecode |
dig-ubafa |
tag |
biblioteca |
region |
America del Sur |
libraryname |
Biblioteca Facultad de Agronomía |
language |
eng |
topic |
LIVER SEED GRASS AFTER RIPENING CONDITION BASE TEMPERATURE DORMANCY RELEASE THERMAL AMPLITUDE THERMAL TIME LIVER SEED GRASS AFTER RIPENING CONDITION BASE TEMPERATURE DORMANCY RELEASE THERMAL AMPLITUDE THERMAL TIME |
spellingShingle |
LIVER SEED GRASS AFTER RIPENING CONDITION BASE TEMPERATURE DORMANCY RELEASE THERMAL AMPLITUDE THERMAL TIME LIVER SEED GRASS AFTER RIPENING CONDITION BASE TEMPERATURE DORMANCY RELEASE THERMAL AMPLITUDE THERMAL TIME Ustarroz, D. Kruk, B. C. Satorre, E. H. Ghersa, C. M. Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
description |
Urochloa panicoides is an annual weed of summer crops. In Argentina, in subhumid areas with monsoon rainfall, it germinates and establishes in a single flush. To (i) identify the environmental factors that modify its seed dormancy level and germination and (ii) quantify the parameters describing the thermal behaviour of the germination and emergence dynamics of this weed under non - limiting water conditions, we established a set of germination experiments performed (i) under controlled conditions using seeds after ripened for 3 or 6 months in different thermal and hydric conditions and (ii) under field conditions, where the soil temperature was modified by applying different shading levels. Seed dormancy level remained high with 3 months after ripening in all treatments. After 6 months, seeds stored at 4°C in dry conditions did not germinate at any temperature, while seeds stored at 25°C in dry conditions and in situ germinated c. 20 per cent and 60 per cent respectively. Germination percentage was higher in seeds harvested before their natural dispersal. The base, optimum and maximum temperatures for seed germination were 6, 35 and 45°C respectively. Shading reduced the number of emerged seedlings, possibly by reducing the soil thermal amplitude. The results explained the dormancy - breaking mechanism of U. panicoides that allows a high germination rate in the field when rainfall occurs. |
format |
info:eu-repo/semantics/article |
topic_facet |
LIVER SEED GRASS AFTER RIPENING CONDITION BASE TEMPERATURE DORMANCY RELEASE THERMAL AMPLITUDE THERMAL TIME |
author |
Ustarroz, D. Kruk, B. C. Satorre, E. H. Ghersa, C. M. |
author_facet |
Ustarroz, D. Kruk, B. C. Satorre, E. H. Ghersa, C. M. |
author_sort |
Ustarroz, D. |
title |
Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
title_short |
Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
title_full |
Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
title_fullStr |
Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
title_full_unstemmed |
Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
title_sort |
dormancy, germination and emergence of urochloa panicoides regulated by temperature |
url |
http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2016ustarroz |
work_keys_str_mv |
AT ustarrozd dormancygerminationandemergenceofurochloapanicoidesregulatedbytemperature AT krukbc dormancygerminationandemergenceofurochloapanicoidesregulatedbytemperature AT satorreeh dormancygerminationandemergenceofurochloapanicoidesregulatedbytemperature AT ghersacm dormancygerminationandemergenceofurochloapanicoidesregulatedbytemperature |
_version_ |
1756546270138204160 |