The origins of weedy rice

Kane, Nolan C.; Baack, Eric J.

doi:10.1111/j.1365-294x.2007.03520.x

Cited by 17 publications

(15 citation statements)

References 13 publications

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“…). Agricultural habitats are known to favour expression of certain traits (Baker ), including rapid growth (Kane and Baack , but see Bommarco et al ), and genetic differentiation has been observed in other weeds moving between non‐agricultural and agricultural habitats (Kane and Rieseberg ).…”

Section: Discussionmentioning

confidence: 99%

Reconstructing changes in the genotype, phenotype, and climatic niche of an introduced species

Atwater

Sezen²,

Goff³

et al. 2015

Ecography

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Early View (EV): 1-EV was expanded upon by Richards et al. (2006), who proposed that benefi cial plasticity in functional traits could produce three general fi tness consequences. For ' general purpose ' or ' jack of all trades ' invasive species, trait plasticity results in fi tness homeostasis. In other, ' master-of-some ' species, plasticity provides a particular fi tness advantage in some, but not all environments. Th is is hypothesised to be especially true for productive environments. Some ' jack and master ' species might have fi tness homeostasis in low-productivity environments but especially high fi tness in productive environments. In a recent meta-analysis, Davidson et al. (2011) found that the functional traits of introduced species were generally more plastic than comparable native species, but that functional trait plasticity did not necessarily relate to increased fi tness or increased homeostasis. Instead, invasive plant fi tness varied more among environments than native plant fi tness.Such fi tness responses to environmental heterogeneity are sometimes taken as evidence that plasticity is adaptive for invasive species. However, adaptation along productivity gradients may produce these responses even when plasticity itself is not under selection. For example, while selection in productive environments is hypothesized to favour traits An introduced species must contend with enormous environmental variation in its introduced range. In this study, we use niche models and ordination analyses to reconstruct changes in genotype, phenotype, and climatic niche of Johnsongrass Sorghum halepense , which is regarded as one of the world ' s most threatening invasive plants. In the United States, Johnsongrass has rapidly evolved within-and among-population genetic diversity; our results show that genetic diff erentiation in expanding Johnsongrass populations has resulted in phenotypic variation that is consistent with habitat and climatic variation encountered during its expansion. Moreover, Johnsongrass expanded from agricultural to non-agricultural habitat, and now, despite occupying overlapping ranges, extant agricultural and non-agricultural populations are genetically and phenotypically distinct and manifest diff erent plastic responses when encountering environmental variation. Non-agricultural accessions are broadly distributed in climatic and geographic space and their fi tness traits demonstrate plastic responses to common garden conditions that are consistent with local specialization. In contrast, agricultural accessions demonstrate ' general purpose ' plastic responses and have more restricted climatic niches and geographic distributions. Th ey also grow much larger than non-agricultural accessions. If these diff erences are adaptive, our results suggest that adaptation to local habitat variation plays a crucial role in the ecology of this invader. Further, its success relates to its ability to succeed on dual fronts, by responding simultaneously to habitat and climate variability and by capitali...

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Section: Discussionmentioning

confidence: 99%

Reconstructing changes in the genotype, phenotype, and climatic niche of an introduced species

Atwater

Sezen²,

Goff³

et al. 2015

Ecography

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“…Research has revealed that four different evolutionary pathways result in what we call weedy rice sensu lato (e.g. Kane and Baack ; Londo and Schaal ; Xia et al. ; Song et al.…”

Section: Weedy Rice: Origin Genetic Diversity and Adaptive Evolutionmentioning

confidence: 99%

“…Indeed, studies have shown that weedy rice populations across the world possess abundant phenotypic and genetic diversity (Cao et al. ; Kane and Baack ; Londo and Schaal ; Xia et al. ,b; Zhang et al.…”

Section: Weedy Rice: Origin Genetic Diversity and Adaptive Evolutionmentioning

confidence: 99%

Fitness correlates of crop transgene flow into weedy populations: a case study of weedy rice in China and other examples

Yang

Ellstrand

2016

Evolutionary Applications

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Whether transgene flow from crops to cross‐compatible weedy relatives will result in negative environmental consequences has been the topic of discussion for decades. An important component of environmental risk assessment depends on whether an introgressed transgene is associated with a fitness change in weedy populations. Several crop‐weed pairs have received experimental attention. Perhaps, the most worrisome example is transgene flow from genetically engineered cultivated rice, a staple for billions globally, to its conspecific weed, weedy rice. China's cultivated/weedy rice system is one of the best experimentally studied systems under field conditions for assessing how the presence of transgenes alters the weed's fitness and the likely impacts of that fitness change. Here, we present the cultivated/weedy rice system as a case study on the consequences of introgressed transgenes in unmanaged populations. The experimental work on this system reveals considerable variation in fitness outcomes ‐ increased, decreased, and none ‐ based on the transgenic trait, its introgressed genomic background, and the environment. A review of similar research from a sample of other crop‐wild pairs suggests such variation is the rule. We conclude such variation in fitness correlates supports the case‐by‐case method of biosafety regulation is sound.

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“…Weedy rice infestations are responsible for significant yield losses, which are particularly severe in short varieties and late planting cultivation (Fogliatto et al [2010]). Weedy rice is so productive that it can spread and cause major economic damage (Kane and Baack [2007]), but it is impossible to control weedy rice during the rice cultivation period by herbicide because it belongs to the same species as the cultivated rice (Delouche et al [2007]; Suh [2003]).…”

Section: Introductionmentioning

confidence: 99%

Seed wintering and deterioration characteristics between weedy and cultivated rice

Baek

Chung

2012

Rice

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BackgroundIncidences of weedy rice continuously occurred in paddy fields because its shattering seeds were able to over-winter. In this research, the seed deterioration of weedy rice was investigated compared with cultivated rice, and the wintering characteristics of these two types of rice were investigated with the field wintering test, freezing resistance test, and accelerated aging test.ResultsFor the wintering test, the seeds of weedy rice were placed on the soil surface of a paddy with cultivated rice seeds during the 2008/2009 and 2009/2010 winter seasons from November to April. The viability of seeds after wintering was 4.3% for cultivated rice, but 92.7% for weedy rice in 2008/2009. In the second wintering test, the seeds were placed under flooded and dry paddy conditions. The seed viability of cultivated rice was 5% in dry paddy and 0.5% in flooded paddy, but weedy rice maintained a high viability during winter of 90% in the dry paddy and 61% in the flooded paddy. Following freezing treatment of the imbibed seeds, the seed viability was 78% for weedy rice and 16% for cultivated rice. The deterioration of seed tissue induced by freezing treatment was observed by the tetrazolium test. In an accelerated aging test at low temperature and soaking conditions, the seed viability of the weedy rice was 40% higher than the cultivated rice 90 days after treatment. During accelerated aging of seeds, the protein content remained higher in the weedy rice compared to the cultivated rice, and fat acidity remained lower in the weedy rice compared to the cultivated rice. Catalase and superoxide dismutase activity of the weedy rice was 4 times higher than that of the cultivated rice, and DPPH radical scavenging activity of the weedy rice was also much higher than for the cultivated rice.ConclusionIn conclusion, the superior ability of seed wintering in weedy rice was based on freezing resistibility of embryo cellular tissue and higher antioxidant activity to protect seed deterioration during the winter season.Electronic supplementary materialThe online version of this article (doi:10.1186/1939-8433-5-21) contains supplementary material, which is available to authorized users.

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The origins of weedy rice

Cited by 17 publications

References 13 publications

Reconstructing changes in the genotype, phenotype, and climatic niche of an introduced species

Reconstructing changes in the genotype, phenotype, and climatic niche of an introduced species

Fitness correlates of crop transgene flow into weedy populations: a case study of weedy rice in China and other examples

Seed wintering and deterioration characteristics between weedy and cultivated rice

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