Luz e KNO3 na germinação de sementes de Ageratum conyzoides L. sob temperaturas constantes e alternadas

Ikeda, F. S.; Carmona, Ricardo; Mitja, Danielle; Guimarães, Renato Mendes

doi:10.1590/s0101-31222008000200024

Cited by 3 publications

References 17 publications

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Preventive Weed Management in Direct-Seeded Rice

Rao

Brainard

Kumar

et al. 2017

Advances in Agronomy

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This chapter was originally published in the book Advances in Agronomy, Vol. 144 published by Elsevier, and the attached copy is provided by Elsevier for the author's benefit and for the benefit of the author's institution, for non-commercial research and educational use including without limitation use in instruction at your institution, sending it to specific colleagues who know you, and providing a copy to your institution's administrator. All other uses, reproduction and distribution, including without limitation commercial reprints, selling or licensing copies or access, or posting on open internet sites, your personal or institution's website or repository, are prohibited. For exceptions, permission may be sought for such use through Elsevier's

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Preventive Weed Management in Direct-Seeded Rice

Rao

Brainard

Kumar

et al. 2017

Advances in Agronomy

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Dormência e armazenabilidade de sementes de capim-gordura

Carmona

Martins

2010

Rev. bras. sementes

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RESUMO -A gramínea africana Melinis minutiflora (capim-gordura), que foi a base da pecuária no Centro-Oeste brasileiro durante aproximadamente dois séculos, é atualmente considerada uma importante planta invasora nessa região. O trabalho foi realizado com o objetivo de avaliar dois aspectos relacionados às sementes que podem influenciar o potencial disseminador dessa espécie -a dormência e a armazenabilidade. As sementes das cultivares Roxo e Cabelo-de-Negro foram armazenadas em ambiente de laboratório em Brasília-DF, sendo sua germinação testada periodicamente tanto nas temperaturas alternadas de 20-30 ºC (16/8 horas), com luz fluorescente branca durante a temperatura mais elevada, empapel filtro umedecido com nitrato de potássio a 0,5%, como na temperatura de 25 ºC no escuro e em água. As sementes recém-colhidas de ambas cultivares apresentaram viabilidade de aproximadamente 100% e alta dormência primária. A viabilidade das sementes armazenadas em laboratório manteve-se elevada (igual ou superior a 90%) pelo período de três anos, sendo que mesmo após oito anos de armazenamento nessas condições algumas sementes ainda preservaram a capacidade germinativa. Nas condições de temperaturas alternadas, o tempo médio de germinação das sementes é de 4,3 e de 4,4 dias para as cultivares Roxo e Cabelo-de-Negro. Foi necessário o período de 3,8 anos para a superação completa da dormência das sementes em armazenamento. A elevada viabilidade associada à dormência, longevidade e rápida germinação observadas no presente trabalho ajudam a explicar o sucesso dessa espécie em colonizar novas áreas.Termos para indexação: biologia, ecologia, colonização, viabilidade de sementes. DORMANCY AND STORAGE POTENTIAL OF MELINIS MINUTIFLORA SEEDSABSTRACT -The African grass species, Melinis minutiflora, which was an important forage species in the Brazilian Cerrado region for around two centuries, is nowadays considered an important weed in this region. The present study aimed to evaluate seed dormancy and viability during storage, aspects that could affect species dissemination. Seeds of the cultivars Roxo and Cabelo-de-Negro stored under laboratory conditions in Brasília-DF, Brazil, were tested periodically, both at alternating temperatures of 20-30 ºC (16/8 hours), with white fluorescent light during the highest temperature, plus potassium nitrate at 0.5%, and at 25 ºC in darkness and in water. Recently-harvested seeds of both cultivars showed approximately 100% viability and a high primary dormancy level. Seed viability remained high for around three years (at least 90%), and even after eight years of storage under these conditions some seeds remained viable.

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Effects of temperature and pre-germinative treatments on seed germination of Talinum triangulare (Jacq. ) willd (Portulacaceae)

Brasileiro¹,

Dias

Casali

et al. 2010

Rev. bras. sementes

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-The objective of this study was to evaluate the effects of temperature, substrate and pre-germinative treatments on T. triangulare seeds. Four temperatures (constant 20, 25, 30 °C and alternate 20-30 °C) and two types of seeding (on paper and between paper), with light, were evaluated. The pre-germinative treatments evaluated included: immersion in water (24 hours), immersion in 6% hypochlorite solution (1 hour), immersion in 0.2% potassium nitrate solution (24 hours), immersion in 0.05% gibberellin solution (24 hours) and the control (untreated seeds). The highest germination percentage was observed at the alternate temperatures of 20-30 ºC, but with no significant difference between the substrates at this temperature. Soaking seeds in KNO 3 gave the highest percentage germination and germination speed index (GSI), which differed from the other treatments except for soaking in water. Presoaking of T. triangulare seeds favors germination and may be done only in pure water, resulting in a more rapid and uniform germination. Termos para indexação: substrato, germinação, dormência, planta medicinal.

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Luz e KNO3 na germinação de sementes de Ageratum conyzoides L. sob temperaturas constantes e alternadas

Cited by 3 publications

References 17 publications

Preventive Weed Management in Direct-Seeded Rice

Preventive Weed Management in Direct-Seeded Rice

Dormência e armazenabilidade de sementes de capim-gordura

Effects of temperature and pre-germinative treatments on seed germination of Talinum triangulare (Jacq. ) willd (Portulacaceae)

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