Understanding the Intricate Web of Phytohormone Signalling in Modulating Root System Architecture

Sharma, Manvi; Singh, Dhriti; Saksena, Harshita B.; Sharma, Mohan; Tiwari, Archna; Awasthi, Prakhar; Botta, Halidev Krishna; Shukla, Brihaspati N.; Laxmi, Ashverya

doi:10.3390/ijms22115508

Cited by 34 publications

(20 citation statements)

References 208 publications

(296 reference statements)

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“…Most of the distribution area, including the center area, of three Fritillaria species received the influence of monsoon from the Indian and Pacific oceans and has sufficient precipitation from May to September. Water was reported to play an essential role in root growth ( Sharma et al, 2021 ), seed dormancy and germination ( Sheppard et al, 2014 ), and leaf growth and photosynthesis ( Peng et al, 2021 ). Water deficiency would activate transcription factors and thus promote the expression of stress-related genes ( Van Beek et al, 2021 ), whereas sufficient water would increase stomatal and leaf area ( Mozo et al, 2021 ) and promote dormancy and germination ( Chritine et al, 2014 ; Sheppard et al, 2014 ).…”

Section: Discussionmentioning

confidence: 99%

Modeling of the Potential Geographical Distribution of Three Fritillaria Species Under Climate Change

et al. 2022

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Fritillaria species, a well-known Chinese traditional medicine for more than 2,000 years, have become rare resources due to excessive harvesting. In order to balance the economical requirement and ecological protection of Fritillaria species, it is necessary to determine (1) the important environmental variables that were responsible for the spatial distribution, (2) distribution change in response to climate change in the future, (3) ecological niche overlap between various Fritillaria species, and (4) the correlation between spatial distribution and phylogenies as well. In this study, the areas with potential ecological suitability for Fritillaria cirrhosa, Fritillaria unibracteata, and Fritillaria przewalskii were predicted using MaxEnt based on the current occurrence records and bioclimatic variables. The result indicated that precipitation and elevation were the most important environmental variables for the three species. Moreover, the current suitable habitats of F. cirrhosa, F. unibracteata, and F. przewalskii encompassed 681,951, 481,607, and 349,199 km2, respectively. Under the scenario of the highest concentration of greenhouse gas emission (SSP585), the whole suitable habitats of F. cirrhosa and F. przewalskii reach the maximum from 2021 to 2100, while those of F. unibracteata reach the maximum from 2021 to 2100 under the scenario of moderate emission (SSP370) from 2021 to 2100. The MaxEnt data were also used to predict the ecological niche overlap, and thus high overlap occurring among three Fritillaria species was observed. The niche overlap of three Fritillaria species was related to the phylogenetic analysis despite the non-significance (P > 0.05), indicating that spatial distribution was one of the factors that contributed to the speciation diversification. Additionally, we predicted species-specific habitats to decrease habitat competition. Overall, the information obtained in this study provided new insight into the potential distribution and ecological niche of three species for the conservation and management in the future.

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Section: Discussionmentioning

confidence: 99%

Modeling of the Potential Geographical Distribution of Three Fritillaria Species Under Climate Change

et al. 2022

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“…In terms of the effect of bacterially produced auxin, IAA does not only trigger root growth, but also many different physiological signals in plants, including secondary metabolism [ 41 ] and various developmental stages [ 42 ]. The IAA signal finally affects almost every aspect of plant physiology, including stress responses [ 43 – 45 ] and interactions with pathogens [ 45 , 46 ], through its intricate interconnection with other plant hormones [ 47 – 49 ]. Therefore, we have not yet clearly understood the IAA biosynthetic pathway, and the ecological advantage of this strain for producing auxin in theirs.…”

Section: Discussionmentioning

confidence: 99%

A highly efficient auxin-producing bacterial strain and its effect on plant growth

Park¹,

Kim²,

Hong³

et al. 2021

Journal of Genetic Engineering and Biotechnology

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Background Various bacteria promote plant root growth in the rhizosphere, as a measure of securing and enlarging their ecological niche. These interactions are mediated by plant growth regulators (PGRs) such as auxin, and indole-3-acetic acid (IAA) is one of the physiologically active auxin. In this study, we isolated an unusual bacterial strain from food process waste with high efficiency and demonstrated its effects on plant rooting and early-stage growth. Results The efficiency of this bacterial strain in producing IAA was 16.6 mg/L/h in Luria-Bertani broth containing 0.05% l-tryptophan (Trp) at room temperature (24 ± 2 °C). Its IAA production was highly dependent on the presence of precursor, Trp. This bacterium was identified as Ignatzschineria sp. by 16S rDNA sequencing. Its bacterial culture supernatant (BCS) enhanced plant root initiation, root growth, and plant growth in the early stages. The root mass formed BCS-treated in apple mint cuttings was twofold of that formed in the control. The root number and length were 46% and 18% higher, respectively, in BCS-treated chrysanthemum cuttings than in the control. Conclusions These results show that the BCS of Ignatzschineria sp. CG20001 isolate obtained in this study can be used for agricultural applications. In addition, the novelty of this strain makes it a valuable genetic resource for biotechnological applications.

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“…Crosstalk of phytohormones involves complex and intricate molecular machinery that regulates root architecture in plants (Sharma et al, 2021). Several plant growth regulators have been characterized to regulate the development of primary and lateral root primordia as well as root symbiosis (Mishra, Suri, et al, 2021; Tiwari & Bhatia, 2020; Tiwari, Pandey, Singh, & Bhatia, 2021; Tiwari, Pandey, Singh, Yadav, et al, 2021).…”

Section: Phytohormones Regulation and Their Interactions In Roots Exp...mentioning

confidence: 99%

Section: Phytohormones Regulation and Their Interactions In Roots Exp...mentioning

confidence: 99%

Genetic and molecular mechanisms underlying root architecture and function under heat stress—A hidden story

Tiwari

Kumar

Min

et al. 2022

Plant Cell & Environment

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Heat stress events are resulting in a significant negative impact on global food production. The dynamics of cellular, molecular and physiological homoeostasis in aboveground parts under heat stress are extensively deciphered. However, root responses to higher soil/air temperature or stress signalling from shoot to root are limited. Therefore, this review presents a holistic view of root physio-morphological and molecular responses to adapt under hotter environments. Heat stress reprogrammes root cellular machinery, including crosstalk between genes, phytohormones, reactive oxygen species (ROS) and antioxidants. Spatio-temporal regulation and long-distance transport of phytohormones, such as auxin, cytokinin and abscisic acid (ABA) determine the root growth and development under heat stress. ABA cardinally integrates a signalling pathway involving heat shock factors, heat shock proteins and ROS to govern heat stress responses. Additionally, epigenetic modifications by transposable elements, DNA methylation and acetylation also regulate root growth under heat stress. Exogenous application of chemical compounds or biological agents such as ascorbic acid, metal ion chelators, fungi and bacteria can alleviate heat stress-induced reduction in root biomass. Future research should focus on the systemic effect of heat stress from shoot to root with more detailed investigations to decipher the molecular cues underlying the roots architecture and function.

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Understanding the Intricate Web of Phytohormone Signalling in Modulating Root System Architecture

Cited by 34 publications

References 208 publications

Modeling of the Potential Geographical Distribution of Three Fritillaria Species Under Climate Change

Modeling of the Potential Geographical Distribution of Three Fritillaria Species Under Climate Change

A highly efficient auxin-producing bacterial strain and its effect on plant growth

Genetic and molecular mechanisms underlying root architecture and function under heat stress—A hidden story

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