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Title: Sorghum stem aerenchyma formation is regulated by SbNAC_D during internode development

Abstract

Abstract Sorghum bicolor is a drought‐resilient C4 grass used for production of grain, forage, sugar, and biomass. Sorghum genotypes capable of accumulating high levels of stem sucrose have solid stems that contain low levels of aerenchyma. The D ‐locus on SBI 06 modulates the extent of aerenchyma formation in sorghum stems and leaf midribs. A QTL aligned with this locus was identified and fine‐mapped in populations derived from BT x623* IS 320c, BT x623*R07007, and BT x623*Standard broomcorn. Analysis of coding polymorphisms in the fine‐mapped D ‐locus showed that genotypes that accumulate low levels of aerenchyma encode a truncated NAC transcription factor (Sobic.006G147400, SbNAC_d1 ), whereas parental lines that accumulate higher levels of stem aerenchyma encode full‐length NAC TF s ( SbNAC‐D ). During vegetative stem development, aerenchyma levels are low in nonelongated stem internodes, internode growing zones, and nodes. Aerenchyma levels increase in recently elongated internodes starting at the top of the internode near the center of the stem. SbNAC_D was expressed at low levels in nonelongated internodes and internode growing zones and at higher levels in regions of stem internodes that form aerenchyma. SbXCP1 , a gene encoding a cysteine protease involved in programmed cell death, was inducedmore » in SbNAC_D genotypes in parallel with aerenchyma formation in sorghum stems but not in SbNAC_d1 genotypes. Several sweet sorghum genotypes encode the recessive SbNAC_d1 allele and have low levels of stem aerenchyma. Based on these results, we propose that SbNAC_D is the D ‐gene identified by Hilton (1916) and that allelic variation in SbNAC_D modulates the extent of aerenchyma formation in sorghum stems.« less

Authors:
 [1];  [2];  [3];  [4];  [2]
  1. Department of Biochemistry and Biophysics Texas A&,M University College Station Texas, Molecular and Environmental Plant Sciences Graduate Program Texas A&,M University College Station Texas
  2. Department of Biochemistry and Biophysics Texas A&,M University College Station Texas
  3. Department of Biochemistry and Biophysics Texas A&,M University College Station Texas, Biochemistry and Biophysics Graduate Program Texas A&,M University College Station Texas
  4. Department of Soil and Crop Sciences Texas A&,M University College Station Texas
Publication Date:
Research Org.:
Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1630213
Alternate Identifier(s):
OSTI ID: 1505781
Grant/Contract Number:  
BER DE-FC02-07ER64494; SC0012629; SC0018409
Resource Type:
Published Article
Journal Name:
Plant Direct
Additional Journal Information:
Journal Name: Plant Direct Journal Volume: 2 Journal Issue: 11; Journal ID: ISSN 2475-4455
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
United Kingdom
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Sorghum bicolor; programmed cell death; D-gene; germplasm

Citation Formats

Casto, Anna L., McKinley, Brian A., Yu, Ka Man Jasmine, Rooney, William L., and Mullet, John E. Sorghum stem aerenchyma formation is regulated by SbNAC_D during internode development. United Kingdom: N. p., 2018. Web. doi:10.1002/pld3.85.
Casto, Anna L., McKinley, Brian A., Yu, Ka Man Jasmine, Rooney, William L., & Mullet, John E. Sorghum stem aerenchyma formation is regulated by SbNAC_D during internode development. United Kingdom. https://doi.org/10.1002/pld3.85
Casto, Anna L., McKinley, Brian A., Yu, Ka Man Jasmine, Rooney, William L., and Mullet, John E. Mon . "Sorghum stem aerenchyma formation is regulated by SbNAC_D during internode development". United Kingdom. https://doi.org/10.1002/pld3.85.
@article{osti_1630213,
title = {Sorghum stem aerenchyma formation is regulated by SbNAC_D during internode development},
author = {Casto, Anna L. and McKinley, Brian A. and Yu, Ka Man Jasmine and Rooney, William L. and Mullet, John E.},
abstractNote = {Abstract Sorghum bicolor is a drought‐resilient C4 grass used for production of grain, forage, sugar, and biomass. Sorghum genotypes capable of accumulating high levels of stem sucrose have solid stems that contain low levels of aerenchyma. The D ‐locus on SBI 06 modulates the extent of aerenchyma formation in sorghum stems and leaf midribs. A QTL aligned with this locus was identified and fine‐mapped in populations derived from BT x623* IS 320c, BT x623*R07007, and BT x623*Standard broomcorn. Analysis of coding polymorphisms in the fine‐mapped D ‐locus showed that genotypes that accumulate low levels of aerenchyma encode a truncated NAC transcription factor (Sobic.006G147400, SbNAC_d1 ), whereas parental lines that accumulate higher levels of stem aerenchyma encode full‐length NAC TF s ( SbNAC‐D ). During vegetative stem development, aerenchyma levels are low in nonelongated stem internodes, internode growing zones, and nodes. Aerenchyma levels increase in recently elongated internodes starting at the top of the internode near the center of the stem. SbNAC_D was expressed at low levels in nonelongated internodes and internode growing zones and at higher levels in regions of stem internodes that form aerenchyma. SbXCP1 , a gene encoding a cysteine protease involved in programmed cell death, was induced in SbNAC_D genotypes in parallel with aerenchyma formation in sorghum stems but not in SbNAC_d1 genotypes. Several sweet sorghum genotypes encode the recessive SbNAC_d1 allele and have low levels of stem aerenchyma. Based on these results, we propose that SbNAC_D is the D ‐gene identified by Hilton (1916) and that allelic variation in SbNAC_D modulates the extent of aerenchyma formation in sorghum stems.},
doi = {10.1002/pld3.85},
journal = {Plant Direct},
number = 11,
volume = 2,
place = {United Kingdom},
year = {Mon Nov 12 00:00:00 EST 2018},
month = {Mon Nov 12 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1002/pld3.85

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Cited by: 16 works
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