Plant Growth-Promoting Abilities in Cyanobacteria

Rai, Amar; Singh, Arvind; Syiem, Mayashree B.

doi:10.1016/b978-0-12-814667-5.00023-4

Cited by 41 publications

(17 citation statements)

References 128 publications

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“…Cyanobacteria play a vital role in atmospheric nitrogen fixation [122,123] and carbon capture and sequestration [124,125], which are vital to plant nutrition and soil fertility. These photosynthetic bacteria also improve microbial community activity and diversity through symbiotic associations [126], and, in addition to EPS, cyanobacteria can excrete several acids, hormones, amino acids and vitamins that enhance plant growth and development [127,128]. Compared to other PGPB, cyanobacteria can increase water holding capacity and soil biomass after their death and decomposition [129].…”

Section: Cyanobacteria As a Nature-based Solution For Salt-affected Soils Restorationmentioning

confidence: 99%

Cyanobacteria as a Nature-Based Biotechnological Tool for Restoring Salt-Affected Soils

et al. 2020

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Soil salinization poses an important threat to terrestrial ecosystems and is expected to increase as a consequence of climate change and anthropogenic pressures. Conventional methods such as salt-leaching or application of soil amendments, or nature-based solutions (NBSs) such as phytoremediation, have been widely adopted with contrasting results. The use of cyanobacteria for improving soil conditions has emerged as a novel biotechnological tool for ecosystem restoration due to the unique features of these organisms, e.g., ability to fix carbon and nitrogen and promote soil stabilisation. Cyanobacteria distribute over a wide range of salt concentrations and several species can adapt to fluctuating salinity conditions. Their application in agricultural saline soil remediation has been demonstrated, mostly in laboratory studies, but there is a lack of research regarding their use in natural ecosystems restoration. In this article, we provide an overview of the current knowledge on cyanobacteria in the context of ecosystem restoration. Examples of the application of cyanobacteria in alleviating salt-stress in plants and soils are presented. Furthermore, we acknowledge gaps regarding the extensive application of cyanobacteria in salt-affected soils remediation and discuss the challenges of NBSs in salt-affected soils restoration.

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Section: Cyanobacteria As a Nature-based Solution For Salt-affected Soils Restorationmentioning

confidence: 99%

Cyanobacteria as a Nature-Based Biotechnological Tool for Restoring Salt-Affected Soils

et al. 2020

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“…Çeşitli biyotik ve abiyotik stres faktörleri ile mücadele etmeye yönelik gen aktarım çalışmaları yapılmıştır [11,13,14]. Biyotik stres faktörlerine karşı yapılan çalışmalar çoğunlukla herbisitlere [15,16], böceklere [17][18][19], virüslere ve bakterilere [20][21][22][23] karşı dirençli transgenik bitkiler elde etmeye yönelik olmuşken, abiyotik stres faktörlerine karşı dirençli transgenik ürün çalışmaları kuraklık [24] ve tuzluluk [25,26] gibi stres faktörlerine yönelik yapılmıştır. Bunlarla beraber gen susturma yöntemleri [27] bir çözüm bulunması henüz mümkün olmamıştır [28,29].…”

Section: Geneti̇ği̇ Deği̇şti̇ri̇lmi̇ş Bi̇tki̇ler (Gd Bi̇tki̇ler)unclassified

Genetiği Değiştirilmiş Bitkilerin Biyogüvenlik Riskleri

Arvas

Kocaçalışkan

2020

Türk Doğa Ve Fen Dergisi

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Genetiği değiştirilmiş organizmalar ve ürünleri, artan dünya nüfusu ve gıda ihtiyacından dolayı son çeyrek asırda çağın teknolojik gelişmelerinin neticesinde geliştirilen rekombinant DNA teknolojileri kullanılarak elde edilmektedir. Organizmalara aktarılan yeni kalıtsal materyalden kaynaklanan potansiyel bir riske sahip olabildikleri düşünülmektedir. Bu riskler canlı sağlığına zarar verip vermediği bulaşma veya diğer türler üzerindeki olumsuz etkileri olup olmadığıdır. Söz konusu riskler bulunmasına rağmen çeşitli stres faktörlerine karşı etkin mücadelede başarılı sonuçlar elde edilmiş ve transgenik ürünler küresel olarak büyük bir ekim alanına ve ticaret hacmine ulaşmıştır. Bütün bu olumlu ve olumsuz yanları, kamuoyunun baskısı ile bu ürünlere yönelik biyogüvenlik risklerini ve önlemlerini kapsayan kanuni uygulamaların yürürlüğe girmesine neden olmuştur. Bu kanunların uygulanmasının nedenleri bu tarz çalışmaları belli bir etik çerçeve içine almak, gıda güvenliği ve kalitesini sağlayarak canlılara olumsuz etkilerinin önüne geçmektir. Biyogüvenlik kanunlarının yasal çerçeveleri oluşturulurken bilimsel ve teknolojik gelişmelerin yanı sıra bu ürünlerin avantaj, dezavantaj veya risklerinin açığa çıkarılması ile ilgili etkin bir kamuoyu algısı oluşturma dikkate alınmalıdır. Bu çalışmada bitkisel üretimde genetiği değiştirilmiş organizmalar ve ürünleri ile ilgili yapılan bilimsel araştırma ve geliştirme, biyogüvenlik risk analizi ve önlemleri, biyogüvenlik risk yönetimi ve iletişimi, ürünlerin piyasaya sürülmesi ve izlenmesi, ithalat ve ihracatı gibi genel biyogüvenlik kurallarını kapsayan biyogüvenlik sorunları ve düzenlemeleri tartışılmaktadır.

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“…However, certain cyanobacteria species can perform nitrogen fixation and oxygenic photosynthesis simultaneously. 18,19 These nitrogenfixing cyanobacteria play important roles in both carbon (C) and nitrogen (N) cycling in aquatic ecosystems. Cyanobacteria can also play an important role in supplying nitrogen to nonlegume plants, such as maize and rice.…”

Section: ■ Introductionmentioning

confidence: 99%

Low Concentrations of Silver Nanoparticles and Silver Ions Perturb the Antioxidant Defense System and Nitrogen Metabolism in N₂-Fixing Cyanobacteria

Huang

Keller

Wang

et al. 2020

Environ. Sci. Technol.

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Although toxic effects of silver nanoparticles (AgNPs) on aquatic organisms have been extensively reported, responses of nitrogen-fixing cyanobacteria to AgNPs/Ag + under environmentally relevant concentrations are largely unknown. Here, cyanobacteria were exposed to different concentrations of AgNPs (0.01, 0.1, and 1 mg/L) or Ag + (0.1, 1, and 10 μg/L) for 96 h. The impacts of AgNPs and Ag + on photosynthesis and N 2 fixation in cyanobacteria (Nostoc sphaeroides) were evaluated. In addition, gas chromatography−mass spectrometry (GC−MS)-based metabolomics was employed to give an instantaneous snapshot of the physiological status of the cells under AgNP/Ag + exposure. Exposure to high doses of AgNPs (1 mg/L) or Ag + (10 μg/L) caused growth inhibition, reactive oxygen species overproduction, malondialdehyde accumulation, and decreased N 2 fixation. In contrast, low doses of AgNPs (0.01 and 0.1 mg/L) and Ag + (0.1 and 1 μg/L) did not induce observable responses. However, metabolomics revealed that metabolic reprogramming occurred even at low concentrations of AgNP and Ag + exposure. Levels of a number of antioxidant defense-related metabolites, especially phenolic acid and polyphenols (gallic acid, resveratrol, isochlorogenic acid, chlorogenic acid, cinnamic acid, 3-hydroxybenzoic acid, epicatechin, catechin, and ferulic acid), significantly decreased in response to AgNPs or Ag +. This indicates that AgNPs and Ag + can disrupt the antioxidant defense system and disturb nitrogen metabolism even at low-dose exposure. Metabolomics was shown to be a powerful tool to detect "invisible" changes, not observable by typical phenotypic-based endpoints.

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Plant Growth-Promoting Abilities in Cyanobacteria

Cited by 41 publications

References 128 publications

Cyanobacteria as a Nature-Based Biotechnological Tool for Restoring Salt-Affected Soils

Cyanobacteria as a Nature-Based Biotechnological Tool for Restoring Salt-Affected Soils

Genetiği Değiştirilmiş Bitkilerin Biyogüvenlik Riskleri

Low Concentrations of Silver Nanoparticles and Silver Ions Perturb the Antioxidant Defense System and Nitrogen Metabolism in N₂-Fixing Cyanobacteria

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Plant Growth-Promoting Abilities in Cyanobacteria

Cited by 41 publications

References 128 publications

Cyanobacteria as a Nature-Based Biotechnological Tool for Restoring Salt-Affected Soils

Cyanobacteria as a Nature-Based Biotechnological Tool for Restoring Salt-Affected Soils

Genetiği Değiştirilmiş Bitkilerin Biyogüvenlik Riskleri

Low Concentrations of Silver Nanoparticles and Silver Ions Perturb the Antioxidant Defense System and Nitrogen Metabolism in N2-Fixing Cyanobacteria

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Low Concentrations of Silver Nanoparticles and Silver Ions Perturb the Antioxidant Defense System and Nitrogen Metabolism in N₂-Fixing Cyanobacteria