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2,144 results on '"Baldwin, Ian T."'

5. Strigolactone and Karrikin Signaling Influence the Recruitment of Wild Tobacco's Root Microbiome in the Desert.

Author

Cheng, Jie, Luo, Shuai, Baldwin, Gundega, Cheng, Xu, Baldwin, Ian T., and Li, Suhua

Subjects
PLANT hormones, RECRUITMENT (Population biology), BACTERIAL diversity, DESERT plants, STRIGOLACTONES
Abstract

Survival in desert ecosystems poses significant challenges for plants due to harsh conditions. Plant microbiomes are thought to promote resilience; however, whether plant hormones, specifically strigolactones (SLs) and karrikins (KARs), shape plant microbiomes remains unknown. The recruitment of root-associated microbiomes in Nicotiana attenuata, a model desert plant, silenced in specific genes associated with SL biosynthesis (CCD7) and perception (D14), karrikin perception (KAI2), and in the shared receptor (MAX2), required for both pathways, was studied. SL and KAR signaling, with MAX2 as a co-regulator, fine-tuned the assembly of root-associated microbiomes, with unique and shared regulatory functions on bacterial microbiome recruitment, particularly in taproot. Significant variation among the different plant genotypes in bacterial diversity and composition in taproot and lateral roots provides a foundation for future research to explore how microbiomes function in plant resilience in these harsh environments. [ABSTRACT FROM AUTHOR]

Published
2025
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27. Independent regulation of strigolactones and blumenols during arbuscular mycorrhizal symbiosis in rice.

Author

Servanté, Emily K., Halitschke, Rayko, Rocha, Catarina, Baldwin, Ian T., and Paszkowski, Uta

Subjects
FUNGAL colonies, PLANT colonization, PLANT-fungus relationships, PHYTOPATHOGENIC fungi, STRIGOLACTONES
Abstract

SUMMARY: The apocarotenoid strigolactones (SLs) facilitate pre‐symbiotic communication between arbuscular mycorrhizal (AM) fungi and plants. Related blumenol‐C‐glucosides (blumenols), have also been associated with symbiosis, but the cues that are involved in the regulation of blumenol accumulation during AM symbiosis remain unclear. In rice, our analyses demonstrated a strict correlation between foliar blumenol abundance and intraradical fungal colonisation. More specifically, rice mutants affected at distinct stages of the interaction revealed that fungal cortex invasion was required for foliar blumenol accumulation. Plant phosphate status and D14L hormone signalling had no effect, contrasting their known role in induction of SLs. This a proportion of the SL biosynthetic enzymes, D27 and D17, are equally required for blumenol production. These results importantly clarify that, while there is a partially shared biosynthetic pathway between SL and blumenols, the dedicated induction of the related apocarotenoids occurs in response to cues acting at distinct stages during the root colonisation process. However, we reveal that neither SLs nor blumenols are essential for fungal invasion of rice roots. Significance Statement: The apocarotenoids strigolactone and blumenol are both associated with arbuscular mycorrhizal symbiosis. Servanté et al. report divergent regulation of each compound despite the partially shared biosynthetic pathway, thereby highlighting the involvement of distinct tissues and signalling cues at different stages of the interaction. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Prezygotic mate selection is only partially correlated with the expression of NaS‐like RNases and affects offspring phenotypes.

Author

Baraniecka, Patrycja, Seibt, Wibke, Groten, Karin, Kessler, Danny, McGale, Erica, Gase, Klaus, Baldwin, Ian T., and Pannell, John R.

Subjects
MATE selection, GENE expression, RIBONUCLEASES, PHENOTYPES, REPRODUCTIVE isolation, GENOME-wide association studies
Abstract

Summary: Nicotiana attenuata styles preferentially select pollen from among accessions with corresponding expression patterns of NaS‐like‐RNases (SLRs), and the postpollination ethylene burst (PPEB) is an accurate predictor of seed siring success. However, the ecological consequences of mate selection, its effect on the progeny, and the role of SLRs in the control of ethylene signaling remain unknown.We explored the link between the magnitude of the ethylene burst and expression of the SLRs in a set of recombinant inbred lines (RILs), dissected the genetic underpinnings of mate selection through genome‐wide association study (GWAS), and examined its outcome for phenotypes in the next generation.We found that high levels of PPEB are associated with the absence of SLR2 in most of the tested RILs. We identified candidate genes potentially involved in the control of mate selection and showed that pollination of maternal genotypes with their favored pollen donors produces offspring with longer roots. When the maternal genotypes are only able to select against nonfavored pollen donors, the selection for such positive traits is abolished.We conclude that plants' ability of mate choice contributes to measurable changes in progeny phenotypes and is thus likely a target of selection. [ABSTRACT FROM AUTHOR]

Published
2024
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43. Wild tobacco genomes reveal the evolution of nicotine biosynthesis

Author

Xu, Shuqing, Brockmöller, Thomas, Navarro-Quezada, Aura, Kuhl, Heiner, Gase, Klaus, Ling, Zhihao, Zhou, Wenwu, Kreitzer, Christoph, Stanke, Mario, Tang, Haibao, Lyons, Eric, Pandey, Priyanka, Pandey, Shree P., Timmermann, Bernd, Gaquerel, Emmanuel, and Baldwin, Ian T.

Published
2017

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