Microalgae as a potential conditioner for continuous cropping obstacles for taro (Colocasia esculenta L. Schott) production

Feng, Yanzhang; Zhang, Haoqing; Song, Xiaotong; Ge, Tida; Jun, Zhu; Zhou, Chengxu; Cobb, Kirk; Yan, Xiaojun; Ruan, Roger; Cheng, Pengfei

doi:10.1016/j.jclepro.2022.133356

Cited by 11 publications

(5 citation statements)

References 40 publications

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“…In this study, microalgal strains C. applanata M9V and C. vulgaris S3 promote crop growth and increase soil nutrient contents, favoring the application of microalgae as biofertilizers to reduce the usage of chemical fertilizers, thereby promoting sustainable crop production. Previous studies have shown that C. vulgaris seems to be a relatively common strain, the same specie as S3 in this study, which can enhance growth parameters and strengthen the metabolic aspects ( Shaaban, 2001 ; Faheed and Abd-El Fattah, 2008 ; Feng et al, 2022 ). To the best of our knowledge, the C. applanata M9V might be the first applanata species of the Chlamydomonas genus that can promote crop growth.…”

Section: Discussionmentioning

confidence: 53%

Application of microalgae Chlamydomonas applanata M9V and Chlorella vulgaris S3 for wheat growth promotion and as urea alternatives

et al. 2022

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Excessive use of chemical fertilizers to meet the global food demand has caused extensive environmental pollution. Microalgae can be used to enhance agricultural crop production as a potentially sustainable and eco-friendly alternative. In this study, Chlamydomonas applanata M9V and Chlorella vulgaris S3 were isolated from the soil and mass-cultured for use as microalgal fertilizers. The influence of microalgae M9V and S3 on the growth of wheat (Triticum aestivum L.) and soil properties was evaluated and compared with that of chemical urea fertilizer. A pot experiment was conducted with six treatments, i.e., living M9V (M9VL), dead M9V (M9VD), living S3 (S3L), dead S3 (S3D), urea fertilizer (urea), and control without fertilizer (control). M9VL was found to have the best effect on wheat growth promotion, followed by M9VD and S3D. In addition, M9VL resulted in the highest enhancement of shoot fresh weight (166.67 and 125.68%), root dry weight (188.89 and 77.35%), leaf length (26.88 and 14.56%), root length (46.04 and 43.93%), chlorophyll a (257.81 and 82.23%), and chlorophyll b contents (269.00 and 247.27%) comparing to the control and urea treatments, respectively. Moreover, all microalgal fertilizer treatments increased soil organic matter (SOM) by 1.77–23.10%, total carbon (TC) by 7.14–14.46%, and C:N ratio by 2.99–11.73% compared to the control and urea treatments. Overall, this study provided two microalgae strains, M9V and S3, that could promote wheat growth and improve soil properties, thus highlighting the use of microalgae as biofertilizers to reduce the use of chemical fertilizers and promoting sustainable agricultural production.

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Section: Discussionmentioning

confidence: 53%

Application of microalgae Chlamydomonas applanata M9V and Chlorella vulgaris S3 for wheat growth promotion and as urea alternatives

et al. 2022

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“…The role of microalgae as players in the plant microbiome has only recently started to be appreciated and their use to improve soil fertility, water preservation, and plant growth is now emerging as a promising approach for sustainable agriculture 48 , 59 , 100 , 101 , 102 , 103 , 104 (see Alvarez et al. 105 for a recent review).…”

Section: Discussionmentioning

confidence: 99%

Genetic evidence for algal auxin production in Chlamydomonas and its role in algal-bacterial mutualism

Calatrava,

Hom,

Guan

et al. 2024

iScience

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“…The role of microalgae as players in the plant microbiome has only recently started to be appreciated and their use to improve soil fertility, water preservation and plant growth is now emerging as a promising approach for sustainable agriculture (Feng et al, 2022; Gitau et al, 2022; Huo et al, 2020; Keswani et al, 2020; Lee and Ryu, 2021; Srivastava et al, 2018; Upadhyay et al, 2016); see Alvarez et al, 2021 for a recent review). For these new applications, understanding how and under what environmental conditions IAA is produced by rhizospheric and phyllospheric algae is of great interest.…”

Section: Discussionmentioning

confidence: 99%

Auxin production in the green alga Chlamydomonas involves an extracellular L-amino acid oxidase and supports algal-bacterial mutualism with methylobacteria

Calatrava

Hom

Llamas

et al. 2022

Preprint

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Interactions between algae and bacteria are widespread in aquatic and terrestrial ecosystems and play fundamental roles in nutrient cycling and biomass production. However, the chemical basis for many of these interactions is poorly characterized and understood. Recent studies have shown that the plant auxin indole acetic acid (IAA) can mediate chemical crosstalk between algae and bacteria, resembling its role in plant-bacterial associations. While algae have been shown to produce IAA, molecular pathways for IAA synthesis in algae have remained elusive. Here, we report a mechanism for IAA production from L-tryptophan mediated by the extracellular enzyme L-amino acid oxidase (LAO1) in the model alga Chlamydomonas reinhardtii. Under inorganic nitrogen limitation but in the presence of L-tryptophan and other amino acids, high levels of IAA are generated in an LAO1-dependent manner. Thus, LAO1 plays a dual role in scavenging nitrogen from L-amino acids and in producing the phytohormone IAA, which subsequently inhibits algal cell multiplication and chlorophyll degradation. We show that these inhibitory effects can be relieved in the presence of Methylobacterium spp., well-known plant growth-promoting bacteria (PGPB), whose growth is mutualistically enhanced by the presence of the alga. These findings reveal a complex interplay of microbial auxin production and degradation by algal-bacterial consortia under nitrogen limitation and draws attention to potential ecophysiological roles of terrestrial microalgae and PGPB in association with land plants.

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Microalgae as a potential conditioner for continuous cropping obstacles for taro (Colocasia esculenta L. Schott) production

Cited by 11 publications

References 40 publications

Application of microalgae Chlamydomonas applanata M9V and Chlorella vulgaris S3 for wheat growth promotion and as urea alternatives

Application of microalgae Chlamydomonas applanata M9V and Chlorella vulgaris S3 for wheat growth promotion and as urea alternatives

Genetic evidence for algal auxin production in Chlamydomonas and its role in algal-bacterial mutualism

Auxin production in the green alga Chlamydomonas involves an extracellular L-amino acid oxidase and supports algal-bacterial mutualism with methylobacteria

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