Differences among rice cultivars in root exudation, methane oxidation, and populations of methanogenic and methanotrophic bacteria in relation to methane emission

Wang, B.; Adachi, Katsuki

doi:10.1007/978-94-010-0898-3_30

Cited by 24 publications

(31 citation statements)

References 17 publications

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“…Different rates of soil gaseous emissions have been related to specific cultivars, crop growth and developmental stage (Wang et al 1997;Wang and Adachi 2000;Das and Baruah 2008). Methane emission of rice cultivars was related to higher root biomass, root exudates, and number of tillers because the plant acts as a conduit for methane transport (Wang et al 1997;Wang and Adachi 2000).…”

Section: Cultivar Mixturesmentioning

confidence: 99%

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Cultivar mixtures of processing tomato in an organic agroecosystem

2010

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At an organic farm in California, managed biodiversity was manipulated by establishing a mustard cover crop (MCC) and fallow during winter, and after incorporation, tomato mixtures of one, three, and five cultivars were planted in the spring (1-cv, 3-cv, and 5-cv, respectively). It was hypothesized that cultivar mixtures may increase yields over a monoculture if disease pressure or nitrogen (N) availability is affected by the previous cover crop. The monoculture (1-

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Section: Cultivar Mixturesmentioning

confidence: 99%

“…Methane emission of rice cultivars was related to higher root biomass, root exudates, and number of tillers because the plant acts as a conduit for methane transport (Wang et al 1997;Wang and Adachi 2000). Gaseous emissions of 3-cv and 5-cv mixtures differed from the monoculture at some spot samplings under the fallow treatment.…”

Section: Cultivar Mixturesmentioning

confidence: 99%

Cultivar mixtures of processing tomato in an organic agroecosystem

2010

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“…5). Based on these ideas, Wang and Adachi 56) studied the effect of rice cultivars on the CH 4 -oxidizing activity and the population of methanotrophic bacteria in rice Fig. 4.…”

Section: Effect Of Rice Cultivars On Ch 4 Emission From the Paddy Fiementioning

confidence: 99%

“…Figure 1 57) shows a sketch of a flooded rice field in relation to CH 4 production, oxidation, and emission, along with CH4 diffusion, ebullition, and leaching from the paddy soil. Rice plants play the key role in CH 4 emission from paddy fields: (1) they supply root exudate and detritus which are substrates for CH4 production 56) ; (2) the rice aerenchyma system is a major pathway of CH 4 from paddy soil to atmosphere 13,42,46) ; (3) the aerenchyma system is also a pathway of O 2 supply to the rice rhizosphere by downward transportation, thus rice plants support CH4 oxidation in the rhizosphere; and (4) the rice rhizosphere itself is an important niche for methanotrophic bacteria which oxidize CH 4 to CO 2 56,63) . Methanogenic archaea (methanogens) are strictly anaerobic microbes belonging to the Archaea domain, and play an important role in anoxic environments by performing the last step of the anaerobic decomposition of organic matter: mineralization into CH 4 and CO 2 27) .…”

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confidence: 99%

Methanogenic Archaea and Methanotrophic Bacteria in a Subtropical Paddy Field and Their Interaction: Controlling Methane Emissions from Paddy Fields.

Adachi

2001

Microb. Environ.

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In flooded rice fields, methanogenic archaea produce CH 4 , while methanotrophic bacteria oxidize a part of the produced CH 4 . Thus, the latter bacteria are considered as suitable organisms for controlling CH 4 emission from paddy fields. In this paper, the author demonstrates a case of organic matter application, enumeration and isolation of methanogenic archaea and methanotrophic bacteria in a subtropical paddy field. The rice rhizosphere is one of the typical areas where anaerobic and aerobic environments interface, methanogens produce CH 4 and methanotrophs utilize it for energy. Although how they interact in the anaerobic and aerobic interfaces is an attractive research area, it has not yet been fully elucidated, because a two-member co-culture of methanogen and methanotroph is not well developed. Co-culture of a strictly anaerobic methanogenic archaeon and an obligately aerobic methanotrophic bacterium using sterilized paddy soil was carried out. The rice root system affects CH 4 production and oxidation in the rice rhizosphere, and its influence varies with different rice cultivars. Rice cultivars with few unproductive tillers, a small root system, high root oxidative activity, and high harvest index are ideal for mitigating CH 4 emission in paddy fields.Key words: methane emission, methanogenic archaeon, methanotrophic bacterium, rice cultivar, subtropical paddy field Methane is one of the significant greenhouse gases related to global warming, and its concentration in the global atmosphere is increasing at a rate of approximately 1% per year 11,35) . In lowland rice cultivation, rice plants grow under flooded conditions and CH 4 is emitted from the fields. Controlling CH4 emission from the paddy fields contributes to the mitigation of global warming. Figure 1 57) shows a sketch of a flooded rice field in relation to CH 4 production, oxidation, and emission, along with CH4 diffusion, ebullition, and leaching from the paddy soil. Rice plants play the key role in CH 4 emission from paddy fields: (1) they supply root exudate and detritus which are substrates for CH4 production 56) ; (2) the rice aerenchyma system is a major pathway of CH 4 from paddy soil to atmosphere 13,42,46) ; (3) the aerenchyma system is also a pathway of O 2 supply to the rice rhizosphere by downward transportation, thus rice plants support CH4 oxidation in the rhizosphere; and (4) the rice rhizosphere itself is an important niche for methanotrophic bacteria which oxidize CH 4 to CO 2 56,63) . Methanogenic archaea (methanogens) are strictly anaerobic microbes belonging to the Archaea domain, and play an important role in anoxic environments by performing the last step of the anaerobic decomposition of organic matter: mineralization into CH 4 and CO 2 27) . Information on the genera and species of methanogenic archaea occurring in flooded paddy soils is gradually accumulating, but it is still limited. On the other hand, methanotrophic bacteria are obligately aerobic respiratory bacteria that can utilize CH 4 as their sole carbon and e...

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“…Butterbach-Bahl et al [23] attributed a difference in CH 4 fluxes among cultivars to differences in CH 4 transport capacity, as no differences were measured between potential CH 4 productions or oxidations among the cultivars. While several studies suggested differences in gas transport capacity or microbial community structure are the major influencing factors on differences in CH 4 fluxes among cultivars, additional studies have consistently suggested that differences in root exudation rates among cultivars are the primary factors that influence differences in CH 4 fluxes among cultivars [26,27,28,57,58].…”

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confidence: 99%

Methane Emissions among Hybrid Rice Cultivars in the MidSouthern United States

A.D.¹,

K.R.²,

R.J.³

2018

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Abstract. Rice (Oryza sativa L.) production systems have a greater global warming potential than upland row crops due to methane (CH4) emissions resulting from anaerobic conditions associated with flood-irrigated soils. Based on recent research indicating the potential for hybrid cultivars to mitigate CH4 emissions from rice, the objective of this study was to determine the influence of several commonly grown hybrid rice cultivars on CH4 fluxes and emissions from a silt-loam soil. Four cultivars were evaluated: the three hybrids CLXL729, CLXL745, and XL753 and the pure-line cultivar Roy J. Methane fluxes were determined by measuring changes in headspace CH4 concentrations over a period of 1 hour using 30-cm-inner-diameter polyvinyl chloride chambers. Only minor differences in CH4 fluxes occurred among the three hybrid cultivars, while the pure-line cultivar (Roy J) generally had greater (P < 0.05) fluxes. Peak CH4 fluxes occurred just after heading and were greater (P < 0.05) from Roy J (7.9 mg CH4-C m -2 h -1) than from the three hybrid cultivars, which did not differ and averaged 5.1 mg CH4-C m -2 h -1. Seasonal CH4 emissions were greater (P < 0.05) from Roy J (74.8 kg CH4-C ha -1 season -1 ) than from CLXL729, XL753, and CLXL745, which did not differ, and averaged 55.3, 53.0, and 48.9 kg CH4-C ha -1 season -1, respectively. Results of this study indicate the use of common hybrid cultivars may have potential for mitigation of CH4 emissions from rice production on silt-loam soils in the mid-southern United States.Keywords: Methane emissions, rice cultivar, hybrid rice, methane mitigation IntroductionRice (Oryza sativa L.) is the world's only major row crop that substantially contributes to global methane (CH 4 ) emissions. While most crops are grown under aerated soil conditions and act as net sinks for atmospheric CH 4 , the majority of rice throughout the globe is produced in flooded fields [1] and acts as a net source of CH 4 into the atmosphere. The anoxic conditions resulting from flooded soils lead to the production and release of CH 4 , a greenhouse gas with a global warming potential (GWP) 25 times stronger than carbon dioxide (CO 2 ) [2]. Due to the production of CH 4 , rice cultivation has been estimated to have a GWP 2.7 and 5.7 times stronger than the production of maize (Zea mays L.) and wheat (Triticum aestivum L.), respectively, with 90% of the GWP of rice systems attributed to CH 4 [3,4]. It has been estimated, on a global scale, that approximately half of all anthropogenic CH 4 emissions to the atmosphere are a direct result of agricultural activities [5,6] and that 22% of those agricultural CH 4 emissions occur due to rice cultivation [7]. Arkansas is the leading rice-producing state in the US, representing over 49% of harvested area in 2014 and resulting in an estimated 39% of total CH 4 emissions from rice cultivation in the US in 2014 [8].Methane emissions from a rice cultivation system are governed by the magnitude and balance between the two microbial processes of methanogenesis, the prod...

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Differences among rice cultivars in root exudation, methane oxidation, and populations of methanogenic and methanotrophic bacteria in relation to methane emission

Cited by 24 publications

References 17 publications

Cultivar mixtures of processing tomato in an organic agroecosystem

Cultivar mixtures of processing tomato in an organic agroecosystem

Methanogenic Archaea and Methanotrophic Bacteria in a Subtropical Paddy Field and Their Interaction: Controlling Methane Emissions from Paddy Fields.

Methane Emissions among Hybrid Rice Cultivars in the MidSouthern United States

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