The effect of flowering time and distance between pollen source and recipient on maize

Nieh, Shuo-Cheng; Lin, Wen-Shin; Hsu, Yung-Heng; Shieh, G. J.; Kuo, Bo‐Jein

doi:10.4161/21645698.2014.947805

Cited by 10 publications

(8 citation statements)

References 18 publications

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“…There is a higher likelihood for gene flow when potential pollen recipients flower at the same time as donor crop species when they are in close proximity (Ellstrand et al, 1999 ; Chapman and Burke, 2006 ; Schmidt and Bothma, 2006 ; FitzJohn et al, 2007 ; Bonnett et al, 2008 ; Tesso et al, 2008 ; Nieh et al, 2014 ). In the current study, there is only one related species with flower synchrony and shared habitat, M. capense , which presents the highest potential for gene flow (Table 10 and Figure 5 ).…”

Section: Discussionmentioning

confidence: 99%

Assessing the Likelihood of Gene Flow From Sugarcane (Saccharum Hybrids) to Wild Relatives in South Africa

Snyman

Komape

Khanyi

et al. 2018

Front. Bioeng. Biotechnol.

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Pre-commercialization studies on environmental biosafety of genetically modified (GM) crops are necessary to evaluate the potential for sexual hybridization with related plant species that occur in the release area. The aim of the study was a preliminary assessment of factors that may contribute to gene flow from sugarcane (Saccharum hybrids) to indigenous relatives in the sugarcane production regions of Mpumalanga and KwaZulu-Natal provinces, South Africa. In the first instance, an assessment of Saccharum wild relatives was conducted based on existing phylogenies and literature surveys. The prevalence, spatial overlap, proximity, distribution potential, and flowering times of wild relatives in sugarcane production regions based on the above, and on herbaria records and field surveys were conducted for Imperata, Sorghum, Cleistachne, and Miscanthidium species. Eleven species were selected for spatial analyses based on their presence within the sugarcane cultivation region: four species in the Saccharinae and seven in the Sorghinae. Secondly, fragments of the nuclear internal transcribed spacer (ITS) regions of the 5.8s ribosomal gene and two chloroplast genes, ribulose-bisphosphate carboxylase (rbcL), and maturase K (matK) were sequenced or assembled from short read data to confirm relatedness between Saccharum hybrids and its wild relatives. Phylogenetic analyses of the ITS cassette showed that the closest wild relative species to commercial sugarcane were Miscanthidium capense, Miscanthidium junceum, and Narenga porphyrocoma. Sorghum was found to be more distantly related to Saccharum than previously described. Based on the phylogeny described in our study, the only species to highlight in terms of evolutionary divergence times from Saccharum are those within the genus Miscanthidium, most especially M. capense, and M. junceum which are only 3 million years divergent from Saccharum. Field assessment of pollen viability of 13 commercial sugarcane cultivars using two stains, iodine potassium iodide (IKI) and triphenyl tetrazolium chloride, showed decreasing pollen viability (from 85 to 0%) from the north to the south eastern regions of the study area. Future work will include other aspects influencing gene flow such as cytological compatibility and introgression between sugarcane and Miscanthidium species.

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Section: Discussionmentioning

confidence: 99%

Assessing the Likelihood of Gene Flow From Sugarcane (Saccharum Hybrids) to Wild Relatives in South Africa

Snyman

Komape

Khanyi

et al. 2018

Front. Bioeng. Biotechnol.

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“…where n is the number of ears at each sampling plot, Ear i the number of purple grains on the i th ear at each sampling plot, and AVK the average grain number of an ear in the field. 15 , 16 …”

Section: Methodsmentioning

confidence: 99%

Effectiveness of different sampling schemes in predicting adventitious genetically modified maize content in a smallholder farming system

Jhong

Lin

Yiu³

et al. 2020

GM Crops & Food

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When genetically modified (GM) maize is planted in an open field, it may cross-pollinate with the nearby non-GM maize under certain airflow conditions. Suitable sampling methods are crucial for tracing adventitious GM content. By using field data and bootstrap simulation, we evaluated the performance of common sampling schemes to determine the adventitious GM content in small maize fields in Taiwan. A pollen dispersal model that considered the effect of field borders, which are common in Asian agricultural landscapes, was used to predict the cross-pollination (CP) rate. For the 2009–1 field data, the six-transect (T six ), JM method for low expected flow (JM[L]), JM method for high expected flow (JM[H]), and V-shaped transect (T V ) methods performed comparably to simple random sampling (SRS). T six , T V , JM(L), and JM(H) required only 13% or less of the sample size required by SRS. After the simulation and verification of the 2009–2 and 2010–1 field data, we concluded that T six , T V , JM(L), and systematic random sampling methods performed equally as well as SRS in CP rate predictions. Our findings can serve as a reference for monitoring the pollen dispersal tendencies of maize in countries with smallholder farming systems.

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“…Also, temporal separation in sowing days improves the coexistence of maize [96]. Contrary to that, temporal isolation based on selection of hybrid varieties in which flowering noncoincide achieves the same results although sowing date was the same [97]. Temporal separation and isolation distance together can be a good solution to minimize unwanted gene flow.…”

Section: Gene Flow From Herbicide-resistant Crops To Wild or Weedy Rementioning

confidence: 99%

Gene Flow from Herbicide-Resistant Crops to Wild Relatives

Vrbničanin¹,

Božić²,

Pavlović³

2017

Herbicide Resistance in Weeds and Crops

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Development of herbicide-resistant (HR) crops is way to overcome problems in weed control due to weed resistance to herbicides and absence of new herbicides with a new mode of action for their control. Three types of HR crops were developed: nontransgenic, transgenic, and multiple HR crops. Cultivation of HR crops is associated not only with many benefits (simplification of weed control, more effective and efficient weed control, higher yields, etc.) but also with various risks (development of HR weeds, development of HR volunteer crops, gene flow from HR crops to susceptible relatives, etc.). The greatest risk is gene flow from HR crops to related weed species, wild relatives or conventional crops of the same species. Unwanted gene flow could be prevented or reduced using different barriers such as isolation in space or time, protective vegetation barriers, male sterility, etc. Sunflower hybrids resistant to herbicides (imidazolinones and sulfonilureas) was developed by conventional breeding methods, and their introduction in Serbian fields has enabled a more efficient control of harmful weed species, but the presence of huge populations of weedy sunflower is the main concern associated with their cultivation, because numerous studies have confirmed gene flow from sunflower to its relatives.

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The effect of flowering time and distance between pollen source and recipient on maize

Cited by 10 publications

References 18 publications

Assessing the Likelihood of Gene Flow From Sugarcane (Saccharum Hybrids) to Wild Relatives in South Africa

Assessing the Likelihood of Gene Flow From Sugarcane (Saccharum Hybrids) to Wild Relatives in South Africa

Effectiveness of different sampling schemes in predicting adventitious genetically modified maize content in a smallholder farming system

Gene Flow from Herbicide-Resistant Crops to Wild Relatives

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