Rice and red rice interference. I. Response of red rice (Oryza sativa) to sowing rates of tropicaljaponicaandindicarice cultivars

Estorninos, Leopoldo E.; Gealy, David R.; Talbert, Ronald E.; Gbur, Edward E.

doi:10.1614/ws-03-141r2.1

Cited by 24 publications

(30 citation statements)

References 29 publications

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“…In addition, different rice cultivars can also respond differently to weedy rice variants. In a study in the United States, rice 'Kaybonnet' was found to be less competitive than 'PI 312777' against weedy rice biotypes (Estorninos et al, 2005). Ratnasekera et al (2013) evaluated the interactions of weedy rice with improved rice (At 362) under transplanting and direct seeding conditions where the general performance of weedy rice was higher with or without competition.…”

Section: Weedy Rice Biology and Competition With Cultivated Ricementioning

confidence: 99%

“…This study suggested that increasing rice crop interference could significantly reduce weedy rice growth. Estorninos et al (2005) stated that the above-ground biomass and weedy rice grain yield decreased with the increase in the cultivated rice seeding rate from 50 to 150 kg ha -1 and, at the same time, rice yield increased with increased crop seeding rates in weedy rice infested fields. High seeding rates could improve the successful reduction of herbicide rates and perceived risks connected to the environmental effect of this chemical.…”

Section: Seeding Rate and Row Seedingmentioning

confidence: 99%

“…Herbicides, such as oxadiazon and metolachlor, offer effective weedy rice control, but these herbicides should be applied at least 15 d before rice planting to avoid the phytotoxic effect on rice (Estorninos et al, 2005). In an intensive rice-based cropping system, there is a need to evaluate the possibility of using herbicides to control weedy rice in situations where the time interval between the two crops is short.…”

Section: Herbicide Usementioning

confidence: 99%

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Competitive ability of cultivated rice against weedy rice biotypes: A review

Olajumoke

Juraimi

Uddin

et al. 2016

Chilean J. Agric. Res.

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Weedy rice has been identified as a threat to rice production worldwide. Its phenotypic and genotypic diversity and its potential to compete against rice in all development stages from germination to maturity have resulted in a loss of rice yield and grain quality, which is remarkably high in directseeded rice cultivation. Weedy rice dormancy varies, it has a higher germination rate, and tolerates deeper germination depth compared to rice cultivars. Interactions of weedy rice with cultivars often reflect early vigor, more tillering, nutrient utilization ability for shoot development with respect to rice cultivars even though the latter also show an improvement in shoot development under competition. An exponential relationship has been reported between cultivated rice loss and weedy rice density: this is true for all rice cultivars. The degree of loss is dependent on the competitive ability of the rice cultivar being studied, and each weedy rice biotype also interacts differently. Hence, the need for a comprehensive study of the biology of various weedy rice variants. Difficulties arise in the management of weedy rice due to its physiological, anatomical, and morphological similarities to cultivated rice. The manipulation of the environment to improve cultivated rice production and suppress the emergence of weedy rice variants is important in the management of weedy rice, as well as other cultural practices and use of pesticides. The development of herbicide-resistant rice cultivars is necessary to totally eliminate the weedy rice variants. This review provides information on the competitive ability of weedy rice against rice cultivars; this information is essential to create management options to control weedy rice.

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Section: Weedy Rice Biology and Competition With Cultivated Ricementioning

confidence: 99%

Section: Seeding Rate and Row Seedingmentioning

confidence: 99%

Section: Herbicide Usementioning

confidence: 99%

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Competitive ability of cultivated rice against weedy rice biotypes: A review

Olajumoke

Juraimi

Uddin

et al. 2016

Chilean J. Agric. Res.

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“…Weedy rice seedlings are often morphologically nearly identical to cultivated rice plants before they reach the reproductive stage, hindering detection and selective weeding. With a rapid growth rate, highly shattering seed, persistent seed dormancy, and dark, undesirable grains that contaminate harvests, weedy rice is considered one of the primary constraints on rice production and marketability in both temperate and tropical regions (Estorninos et al 2005; Gealy et al 2012; Merotto et al 2016). In addition, the potential for crop–weed gene flow threatens the long-term sustainability of weed control strategies that rely on herbicide-resistant rice cultivars (Pusadee et al 2013; Burgos et al 2014; Merotto et al 2016).…”

mentioning

confidence: 99%

Little White Lies: Pericarp Color Provides Insights into the Origins and Evolution of Southeast Asian Weedy Rice

Cui

Song

et al. 2016

G3 Genes|Genomes|Genetics

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Weedy rice is a conspecific form of cultivated rice (Oryza sativa L.) that infests rice fields and results in severe crop losses. Weed strains in different world regions appear to have originated multiple times from different domesticated and/or wild rice progenitors. In the case of Malaysian weedy rice, a multiple-origin model has been proposed based on neutral markers and analyses of domestication genes for hull color and seed shattering. Here, we examined variation in pericarp (bran) color and its molecular basis to address how this trait evolved in Malaysian weeds and its possible role in weed adaptation. Functional alleles of the Rc gene confer proanthocyanidin pigmentation of the pericarp, a trait found in most wild and weedy Oryzas and associated with seed dormancy; nonfunctional rc alleles were strongly favored during rice domestication, and most cultivated varieties have nonpigmented pericarps. Phenotypic characterizations of 52 Malaysian weeds revealed that most strains are characterized by the pigmented pericarp; however, some weeds have white pericarps, suggesting close relationships to cultivated rice. Phylogenetic analyses indicate that the Rc haplotypes present in Malaysian weeds likely have at least three distinct origins: wild O. rufipogon, white-pericarp cultivated rice, and red-pericarp cultivated rice. These diverse origins contribute to high Rc nucleotide diversity in the Malaysian weeds. Comparison of Rc allelic distributions with other rice domestication genes suggests that functional Rc alleles may confer particular fitness benefits in weedy rice populations, for example, by conferring seed dormancy. This may promote functional Rc introgression from local wild Oryza populations.

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“…O arroz-vermelho (Oryza sativa) é a principal planta daninha das áreas produtoras de arroz do mundo (Estorninos Jr. et al, 2005). Estimativas demonstram que o Rio Grande do Sul deixa de produzir o correspondente a 20% de sua produção de arroz devido à competição do arroz-vermelho (Gomes & Magalhães Jr., 2004).…”

Section: Introductionunclassified

Efeito de deriva simulada de herbicida inibidor de ALS nos componentes da produtividade do arroz irrigado

Magro

Agostinetto²,

Pinto³

et al. 2006

Planta daninha

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O objetivo deste trabalho foi quantificar os efeitos causados pela deriva simulada do herbicida imazethapyr + imazapic nos componentes da produtividade de grãos de arroz irrigado, em função da época de início da irrigação por inundação. Para isso, foi conduzido experimento no ano agrícola 2003/04, em condições de campo, no Centro Agropecuário da Palma (CAP/UFPel). O delineamento experimental utilizado foi o de blocos casualizados, com quatro repetições. A deriva foi simulada pela aplicação de doses crescentes do herbicida imazethapyr + imazapic, correspondendo a 0; 3,125; 6,25; 12,5; 25; 50; e 100% da dose comercial, acrescido de Dash a 0,5% v/v, sobre as plantas de arroz, cultivar BRS Pelota, em estádios fenológicos V3 - V4, com inundação três dias antes ou após a aplicação dos tratamentos. A aplicação foi feita com pulverizador costal, pressurizado a CO2, munido de barra com bicos 110.015 do tipo leque a uma pressão constante de 210 kPa, que proporcionou a aplicação de 150 L ha-1 de calda herbicida. As variáveis avaliadas foram: número de colmos, em estádio R3, número de grãos por panícula, número de espiguetas estéreis, peso de mil grãos e produtividade de grãos, determinados por ocasião da colheita. O herbicida imazethapyr + imazapic reduziu o número de colmos de arroz, o número de grãos e de espiguetas estéreis por panícula, o peso de mil grãos e a produtividade de grãos com o aumento da dose aplicada, quando esta ocorreu em cultura mantida no seco. A antecipação do início da irrigação por inundação, em lavouras semeadas com cultivar suscetível, evita possíveis prejuízos ocasionados por deriva de imazethapyr + imazapic no número de colmos, número de grãos e espiguetas estéreis por panícula, peso de mil grãos e produtividade de grãos.

show abstract

Rice and red rice interference. I. Response of red rice (Oryza sativa) to sowing rates of tropicaljaponicaandindicarice cultivars

Cited by 24 publications

References 29 publications

Competitive ability of cultivated rice against weedy rice biotypes: A review

Competitive ability of cultivated rice against weedy rice biotypes: A review

Little White Lies: Pericarp Color Provides Insights into the Origins and Evolution of Southeast Asian Weedy Rice

Efeito de deriva simulada de herbicida inibidor de ALS nos componentes da produtividade do arroz irrigado

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