Variations in growth,seed dormacy and herbicide susceptibility among strains of Echinochloa oryzicola Vasing.

祐二, 山末; 貞文, 江田; 邦和, 植木; 昭一, 松中

doi:10.3719/weed.26.6

Cited by 4 publications

(3 citation statements)

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“…The majority of samples were highly resistant to propanil, with only one sample classified as susceptible ( Table 1). Levels of propanil resistance have been reported in junglerice [Echinochloa colona (L.) Link] from Columbia (6) and Costa Rica (8), barnyardgrass from Greece (9), and in several strains of Echinochloa oryzicola Vasing (also called barnyardgrass) from Japan (17). This may indicate that several genes are interacting to confer resistance, as was proposed for atrazine [6-chloro-A/ r -ethyl-A^/ -( 1methylethyl)-l,3,5-triazine-2,4-diamine] resistance in barnyardgrass (7).…”

Section: Resultsmentioning

confidence: 99%

Verification and Distribution of Propanil-Resistant Barnyardgrass (Echinochloa crus-galli)in Arkansas

1995

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Propanil-resistant barnyardgrass was reported in Poinsett County, AR, in 1990. Greenhouse studies were initiated to determine the distribution of propanil-resistant barnyardgrass in the state and to characterize the resistance. Barnyardgrass seeds were obtained in 1991 and 1992 from fields in 19 of the 38 rice producing counties in Arkansas where propanil treatment at recommended rates gave unsatisfactory barnyardgrass control. Barnyardgrass seedlings from the various sources were treated with propanil at 4.5 kg ai/ha and seedling injury response was compared to the response of seedlings collected from known resistant and susceptible barnyardgrass populations. Propanil-resistance of varying levels was confirmed in 115 (16 counties) out of the 138 Arkansas barnyardgrass seed sources. Propanil I50values (rate of herbicide required to provide 50% injury/control) were determined to be 14, 20, and 39 kg/ha for slightly, moderately, and highly resistant barnyardgrass, respectively. A resistance factor of 20® was found in the highly resistant barnyardgrass category. Development of resistance was highly correlated with crop rotations where rice was grown one out of two, or two out of three years.

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Section: Resultsmentioning

confidence: 99%

Verification and Distribution of Propanil-Resistant Barnyardgrass (Echinochloa crus-galli)in Arkansas

1995

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“…is an obligate weed in flooded rice of many countries in Asia and a few countries in North America and Europe. Among the Japanese strains of E. oryzicola originating from 32 to 44N, it is known that there is a geographical variation in heading period photoperiodic sensitivity5, 10,12). Plants of E. oryzicola strains originating from locations higher in latitude exhibit earlier heading period than those from lower latitudes.…”

Section: Echinochloa Oryzicolamentioning

confidence: 99%

Geographical Variation in Heading Photoperiodic Sensitivity of Echinochloa oryzicola Vasing.

Nakatani¹,

Tanisaka²,

Yamasue³

1998

J. Weed Sci. Tech

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Photoperiodic sensitivity in heading of Echinochloa oryzicola Vasing., an obligate weed in flooded rice, was determined with 20 strains originally collected in nine countries from 7S to 44N. Plants of the strains were grown under 12, 14 and 16-hr photoperiods at 25C and the days to heading after sowing were recorded to classify them in photoperiod sensitivity by the duration of the basic vegetative phase (BVP) and photosensitive phase (PSP). The strains originally collected in the temperate region above 30N were classified into those with either weak or strong sensitivity. A geographical cline was apparent among them and the strains from higher latitude exhibited heading earlier under 14-hr photoperiod. All of the seven strains from the subtropical and tropical regions below 30N had a PSP of less than 30 days and were classified among those with photoperiod insensitivity. It is likely that this trait of E. oryzicola is advantageous for its wider adaptability in diverse rice cropping systems in these regions.

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“…Also because of the genetic control of dormancy, contrasting degrees of dormancy can be found in natural populations of plants within the same species, as in Avena fatua (Andrews and Simpson, 1969)» Amaranthus retroflexus (McWilliams et al, 1968) Amaranthus powellii (Frost and Cavers, 1975), and Echinochloa oryzicola (Yamasue et al, 1981).…”

Section: F Dormancy Inceptionmentioning

confidence: 99%

Seed dormancy characteristics in six weed species as affected by after-ripening temperatures and field conditions

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Variations in growth,seed dormacy and herbicide susceptibility among strains of Echinochloa oryzicola Vasing.

Cited by 4 publications

References 1 publication

Verification and Distribution of Propanil-Resistant Barnyardgrass (Echinochloa crus-galli)in Arkansas

Verification and Distribution of Propanil-Resistant Barnyardgrass (Echinochloa crus-galli)in Arkansas

Geographical Variation in Heading Photoperiodic Sensitivity of Echinochloa oryzicola Vasing.

Seed dormancy characteristics in six weed species as affected by after-ripening temperatures and field conditions

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