Dormência em sementes de arroz vermelho

Delatorre, Carla Andréa

doi:10.1590/s0103-84781999000300032

Cited by 6 publications

(3 citation statements)

References 51 publications

(37 reference statements)

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“…In addition, several weedy rice studies have focused on aspects such as seed dormancy (Cohn et al, 1987;Cohn et al, 1989;Delatorre, 1999), emergence , flowering tim e and int erf ere nce wit h the cul tiv ate d va ri et ie s (K wo n et al ., 1991 ;Pa nt on e & Baker, 1991;Ortiz et al, 1999;Estorninos et al, 2002;Fonseca et al, 2004). However, the chronology of the vegetative and reproductive life cycle of weedy rice has been less studied.…”

Section: Introductionmentioning

confidence: 99%

Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa)

2007

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-The variability in the chronology of the vegetative and reproductive development of weedy rice complex has been little studied. However, a field trial was established to study the timing of growth stages of sixteen weedy rice morphotypes and five rice varieties of Costa Rica. Weedy rice presented a wide range of variation for all descriptors among and within morphotypes. Weedy rice was taller than the rice varieties during vegetative phase and showed a growth increase of 14-23 cm every two weeks. Six morphotypes emerged earlier than commercial rice varieties, but no differences where found between samples for the time required for starting tillering. Early emergence of weedy rice morphotypes was not associated with early flowering, thus no correlation was detected between the vegetative and reproductive phases. All weedy rice morphotypes reached anthesis and maturity earlier than the rice varieties. Nevertheless, varieties Setesa-9 and CR-5272 overlapped anthesis with eleven morphotypes and variety CR-4338 overlapped flowering with eight weedy rice morphotypes. In contrast, none of the morphotypes overlapped anthesis with varieties CR-1821 and CR-1113. The results obtained showed the competitive capacity of weedy rice and provided valuable information about flowering overlap between weedy rice morphotypes and rice varieties which will be useful in the design of gene flow studies among them.Keywords: anthesis overlapping; growth stages; red rice; rice varieties. RESUMO -O desenvolvimento vegetativo e reprodutivo das diferentes variantes morfológicas do arroz-vermelho tem sido pouco estudado. Um ensaio de campo com dezesseis morfotipos de arroz-vermelho e cinco variedades comerciais de arroz da Costa Rica foi estabelecido com o fim de estudar o crescimento dessa planta daninha. Nos resultados, observou-se que o arroz-vermelho

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Section: Introductionmentioning

confidence: 99%

Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa)

2007

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“…A duração e a intensidade da dormência variam em função do biótipo e, também, dependem das condições do ambiente durante o desenvolvimento das sementes (Delatorre, 1999). Ainda segundo esse autor, a maior parte dos biótipos de arroz-vermelho apresenta dois tipos de dormência: um devido às estruturas envoltórias das sementes e outro devido à incapacidade de o embrião germinar, o qual vai sendo reduzido com o tempo pós-colheita.…”

Section: Resultsunclassified

Caracterização de biótipos de arroz-vermelho em lavouras de arroz no estado do Rio Grande do Sul

et al. 2002

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“…Variability in seed dormancy period is quite common in weedy rice; some biotypes germinate shortly after harvest and others can take weeks to months to germinate (Delatorre, 1999). Noldin et al (2006) found 21% of viable red/weedy rice seeds at a 25 cm depth after 5 months of burial.…”

Section: Seed Shattering and Longevity Of Weedy Rice Seedbankmentioning

confidence: 99%

Rising atmospheric CO₂ concentration affect weedy rice growth, seed shattering and seedbank longevity

et al. 2022

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Weedy rice (Oryza sp.) is one of the most troublesome global weeds in cultivated rice.Its troublesome status is associated with characteristics such as seed shattering and dormancy, allowing for long-term reinfestation and persistence in rice fields. However, the role of rising carbon dioxide levels (CO 2 ) and other climate variables on these characteristics has not, to date, been assessed. The current research objectives were to evaluate two aspects related to climatic change, increased CO 2 concentration (400 ± 50 μmol mol À1 and 700 ± 50 μmol mol À1 ) and water management (continuous and alternate-wetting drying), to assess plant development, seed shattering and seedbank longevity of weedy rice. Our results indicated that elevated CO 2 (700 ± 50 μmol mol À1 ) increased weedy rice growth and biomass, seed shattering and lengthened viability within the seedbank. Water management did not affect weedy rice growth, seed shattering and seed dormancy. These results suggest that in areas where weedy rice is dominant, its seed bank persistence and potential competition may be exacerbated with rising CO 2 levels, with negative consequences for rice production.

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Dormência em sementes de arroz vermelho

Abstract: RESUMO O arroz vermelho é considerado a principal planta daninha na maioria das lavouras de arroz, pois, além dos prejuí-

Cited by 6 publications

References 51 publications

Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa)

Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa)

Caracterização de biótipos de arroz-vermelho em lavouras de arroz no estado do Rio Grande do Sul

Rising atmospheric CO₂ concentration affect weedy rice growth, seed shattering and seedbank longevity

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Dormência em sementes de arroz vermelho

Abstract: RESUMO O arroz vermelho é considerado a principal planta daninha na maioria das lavouras de arroz, pois, além dos prejuí-

Cited by 6 publications

References 51 publications

Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa)

Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa)

Caracterização de biótipos de arroz-vermelho em lavouras de arroz no estado do Rio Grande do Sul

Rising atmospheric CO2 concentration affect weedy rice growth, seed shattering and seedbank longevity

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Rising atmospheric CO₂ concentration affect weedy rice growth, seed shattering and seedbank longevity