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Response of Sorghum Enhanced in Monolignol Biosynthesis to Stalk Rot Pathogens.
- Source :
-
Plant disease [Plant Dis] 2019 Sep; Vol. 103 (9), pp. 2277-2287. Date of Electronic Publication: 2019 Jun 19. - Publication Year :
- 2019
-
Abstract
- To increase phenylpropanoid constituents and energy content in the versatile C <subscript>4</subscript> grass sorghum ( Sorghum bicolor [L.] Moench), sorghum genes for proteins related to monolignol biosynthesis were overexpressed: SbMyb60 (transcriptional activator), SbPAL (phenylalanine ammonia lyase), SbCCoAOMT (caffeoyl coenzyme A [CoA] 3- O -methyltransferase), Bmr2 (4-coumarate:CoA ligase), and SbC3H (coumaroyl shikimate 3-hydroxylase). Overexpression lines were evaluated for responses to stalk pathogens under greenhouse and field conditions. Greenhouse-grown plants were inoculated with Fusarium thapsinum (Fusarium stalk rot) and Macrophomina phaseolina (charcoal rot), which cause yield-reducing diseases. F. thapsinum -inoculated overexpression plants had mean lesion lengths not significantly different than wild-type, except for significantly smaller lesions on two of three SbMyb60 and one of two SbCCoAOMT lines. M. phaseolina -inoculated overexpression lines had lesions not significantly different from wild-type except one SbPAL line (of two lines studied) with mean lesion lengths significantly larger. Field-grown SbMyb60 and SbCCoAOMT overexpression plants were inoculated with F. thapsinum . Mean lesions of SbMyb60 lines were similar to wild-type, but one SbCCoAOMT had larger lesions, whereas the other line was not significantly different than wild-type. Because overexpression of SbMyb60 , Bmr2 , or SbC3H may not render sorghum more susceptible to stalk rots, these lines may provide sources for development of sorghum with increased phenylpropanoid concentrations.
Details
- Language :
- English
- ISSN :
- 0191-2917
- Volume :
- 103
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Plant disease
- Publication Type :
- Academic Journal
- Accession number :
- 31215851
- Full Text :
- https://doi.org/10.1094/PDIS-09-18-1622-RE