Characterization of growth and development of sorghum genotypes with differential susceptibility to Striga hermonthica.
Striga hermonthica
Developmental delay
gibberellins
lateral root
metabolism
root system architecture
sorghum
strigolactone
Journal
Journal of experimental botany
ISSN: 1460-2431
Titre abrégé: J Exp Bot
Pays: England
ID NLM: 9882906
Informations de publication
Date de publication:
04 12 2021
04 12 2021
Historique:
received:
24
02
2021
accepted:
17
08
2021
pubmed:
20
8
2021
medline:
31
12
2021
entrez:
19
8
2021
Statut:
ppublish
Résumé
Two sorghum varieties, Shanqui Red (SQR) and SRN39, have distinct levels of susceptibility to the parasitic weed Striga hermonthica, which have been attributed to different strigolactone composition within their root exudates. Root exudates of the Striga-susceptible variety Shanqui Red (SQR) contain primarily 5-deoxystrigol, which has a high efficiency for inducing Striga germination. SRN39 roots primarily exude orobanchol, leading to reduced Striga germination and making this variety resistant to Striga. The structural diversity in exuded strigolactones is determined by a polymorphism in the LOW GERMINATION STIMULANT 1 (LGS1) locus. Yet, the genetic diversity between SQR and SRN39 is broad and has not been addressed in terms of growth and development. Here, we demonstrate additional differences between SQR and SRN39 by phenotypic and molecular characterization. A suite of genes related to metabolism was differentially expressed between SQR and SRN39. Increased levels of gibberellin precursors in SRN39 were accompanied by slower growth rate and developmental delay and we observed an overall increased SRN39 biomass. The slow-down in growth and differences in transcriptome profiles of SRN39 were strongly associated with plant age. Additionally, enhanced lateral root growth was observed in SRN39 and three additional genotypes exuding primarily orobanchol. In summary, we demonstrate that the differences between SQR and SRN39 reach further than the changes in strigolactone profile in the root exudate and translate into alterations in growth and development.
Identifiants
pubmed: 34410382
pii: 6354809
doi: 10.1093/jxb/erab380
pmc: PMC8643648
doi:
Substances chimiques
Lactones
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
7970-7983Subventions
Organisme : Bill & Melinda Gates Foundation
ID : OPP1082853
Pays : United States
Organisme : Howard Hughes Medical Institute
Pays : United States
Informations de copyright
© The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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