Brassinosteroids play multiple roles in nodulation of pea via interactions with ethylene and auxin

McGuiness, Peter N.; Reid, James B.; Foo, Eloise

doi:10.1007/s00425-020-03478-z

Cited by 9 publications

(7 citation statements)

References 31 publications

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“…Ethylene, GA, and BRs all suppress epidermal infection. This is best understood for ethylene; studies using the application of ethylene and ethylene synthesis inhibitors and mutants disrupted in ethylene signaling indicate that ethylene strongly inhibits root hair curling and IT formation ( Penmetsa and Cook, 1997 ; Nukui et al., 2004 ; Lohar et al., 2009 ; Larrainzar et al., 2015 ; McAdam et al., 2018 ; Reid et al., 2018 ; McGuiness et al., 2020 ). Ethylene appears to inhibit Nod factor response via suppression of Ca 2 + spiking ( Oldroyd et al., 2001 ).…”

Section: Epidermal Infectionmentioning

confidence: 99%

“…In a similar manner to ethylene and GA, BRs also appear to suppress rhizobial infection. A small increase in IT number was observed in severely BR-deficient mutants of pea ( McGuiness et al., 2020 ). This did not appear to be mediated through ethylene but was correlated with elevated auxin response as measured by DR5::GUS in the cortex in response to inoculation but, interestingly, not in infected root hairs ( McGuiness et al., 2020 ).…”

Section: Epidermal Infectionmentioning

confidence: 99%

“…A small increase in IT number was observed in severely BR-deficient mutants of pea ( McGuiness et al., 2020 ). This did not appear to be mediated through ethylene but was correlated with elevated auxin response as measured by DR5::GUS in the cortex in response to inoculation but, interestingly, not in infected root hairs ( McGuiness et al., 2020 ). This suggests that BRs may negatively regulate early events in nodulation by influencing auxin accumulation in the cortex ( McGuiness et al., 2020 ), and the role of auxin in this process is covered in more detail below.…”

Section: Epidermal Infectionmentioning

confidence: 99%

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Right time, right place: The dynamic role of hormones in rhizobial infection and nodulation of legumes

Velandia¹,

Reid²,

Foo³

2022

Plant Communications

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Section: Epidermal Infectionmentioning

confidence: 99%

Section: Epidermal Infectionmentioning

confidence: 99%

Section: Epidermal Infectionmentioning

confidence: 99%

See 1 more Smart Citation

Right time, right place: The dynamic role of hormones in rhizobial infection and nodulation of legumes

Velandia¹,

Reid²,

Foo³

2022

Plant Communications

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“…Currently, there are no data regarding how these molecules could act during nodule development and cell differentiation. Reported downregulation of the Psat4g097000 gene (characterized as 3-epi-6-deoxocathasterone 23-monooxygenase known to be involved in brassinosteroid biosynthesis in A. thaliana [75]) follows recent studies on the role of brassinosteroids in nodule development and functioning that noted little effect of this phytohormone on the mature nodule in P. sativum [76]. In concert with the PR gene suppression in the late infection zone described above, we noted that expression of the Psat1g006640 gene, characterized as a gene encoding a glucan endo-1,3-beta-glucosidaselike protein, was decreased.…”

Section: Discussionmentioning

confidence: 67%

Laser Microdissection of Pisum sativum L. Nodules Followed by RNA-Seq Analysis Revealed Crucial Transcriptomic Changes during Infected Cell Differentiation

et al. 2021

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Garden pea (Pisum sativum L.) is a globally important legume crop. Like other legumes, it forms beneficial symbiotic interactions with the soil bacteria rhizobia, gaining the ability to fix atmospheric nitrogen. In pea nodules, the meristem is long-lasting and results in the formation of several histological zones that implicate a notable differentiation of infected host cells. However, the fine transcriptional changes that accompany differentiation are still unknown. In this study, using laser microdissection followed by RNA-seq analysis, we performed transcriptomic profiling in the early infection zone, late infection zone, and nitrogen fixation zone of 11-day-old nodules of pea wild-type line SGE. As a result, a list of functional groups of differentially expressed genes (DEGs) in different nodule histological zones and a list of genes with the most prominent expression changes during nodule development were obtained. Their analyses demonstrated that the highest amount of DEGs was associated with the nitrogen fixation zone. Among well-known genes controlling nodule development, we revealed genes that can be novel players throughout nodule formation. The characterized genes in pea were compared with those previously described in other legumes and their possible functions in nodule development are discussed.

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“…Moreover, plant hormones also influence how plant-microbe interactions evolve [99]. A constructive role of BRs in arbuscular mycorrhizal (AM) association and nodulation was presented by McGuiness et al [100][101][102]. In tomato, pea and rice, mutations in the BR synthesising cascade inhibited AM symbiosis [103], whereas foliar application of BRs in wheat encouraged AM colonisation [104].…”

Section: Discussionmentioning

confidence: 99%

Amelioration of Chlorpyrifos-Induced Toxicity in Brassica juncea L. by Combination of 24-Epibrassinolide and Plant-Growth-Promoting Rhizobacteria

et al. 2021

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Pervasive use of chlorpyrifos (CP), an organophosphorus pesticide, has been proven to be fatal for plant growth, especially at higher concentrations. CP poisoning leads to growth inhibition, chlorosis, browning of roots and lipid and protein degradation, along with membrane dysfunction and nuclear damage. Plants form a linking bridge between the underground and above-ground communities to escape from the unfavourable conditions. Association with beneficial rhizobacteria promotes the growth and development of the plants. Plant hormones are crucial regulators of basically every aspect of plant development. The growing significance of plant hormones in mediating plant–microbe interactions in stress recovery in plants has been extensively highlighted. Hence, the goal of the current study was to investigate the effect of 24-epibrassinolide (EBL) and PGPRs (Pseudomonas aeruginosa (Ma), Burkholderia gladioli (Mb)) on growth and the antioxidative defence system of CP-stressed Brassica juncea L. seedlings. CP toxicity reduced the germination potential, hypocotyl and radicle development and vigour index, which was maximally recuperated after priming with EBL and Mb. CP-exposed seedlings showed higher levels of superoxide anion (O2.−), hydrogen peroxide (H2O2), lipid peroxidation and electrolyte leakage (EL) and a lower level of nitric oxide (NO). In-vivo visualisation of CP-stressed seedlings using a light and fluorescent microscope also revealed the increase in O2.−, H2O2 and lipid peroxidation, and decreased NO levels. The combination of EBL and PGPRs reduced the reactive oxygen species (ROS) and malondialdehyde (MDA) contents and improved the NO level. In CP-stressed seedlings, increased gene expression of defence enzymes such as superoxide dismutase (SOD), ascorbate peroxidase (APOX), glutathione peroxidase (GPOX), dehydroascorbate reductase (DHAR) and glutathione reductase (GPOX) was seen, with the exception of catalase (CAT) on supplementation with EBL and PGPRs. The activity of nitrate reductase (NR) was likewise shown to increase after treatment with EBL and PGPRs. The results obtained from the present study substantiate sufficient evidence regarding the positive association of EBL and PGPRs in amelioration of CP-induced oxidative stress in Brassica juncea seedlings by strengthening the antioxidative defence machinery.

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Brassinosteroids play multiple roles in nodulation of pea via interactions with ethylene and auxin

Cited by 9 publications

References 31 publications

Right time, right place: The dynamic role of hormones in rhizobial infection and nodulation of legumes

Right time, right place: The dynamic role of hormones in rhizobial infection and nodulation of legumes

Laser Microdissection of Pisum sativum L. Nodules Followed by RNA-Seq Analysis Revealed Crucial Transcriptomic Changes during Infected Cell Differentiation

Amelioration of Chlorpyrifos-Induced Toxicity in Brassica juncea L. by Combination of 24-Epibrassinolide and Plant-Growth-Promoting Rhizobacteria

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