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The Evolution of Photoperiod-Insensitive Flowering in Sorghum, A Genomic Model for Panicoid Grasses

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Title The Evolution of Photoperiod-Insensitive Flowering in Sorghum, A Genomic Model for Panicoid Grasses
 
Creator Cuevas, Hugo
 
Contributor Zhou, Chengbo
Tang, Haibao
Khadke, Prashant
Das, Sayan
Lin, Yann-rong
Ge, Zhengxiang
Clemente, Thomas
Upadhyaya, Hari D.
Hash, Charles
Paterson, Andrew H.
 
Subject conversion
ft domain
sorghum halepense (“johnsongrass”)
single gene duplication.
Sorghum
 
Description Of central importance in adapting plants of tropical origin to temperate cultivation has been selection of daylengthneutral
genotypes that flower early in the temperate summer and take full advantage of its long days. A cross between
tropical and temperate sorghums [Sorghum propinquum (Kunth) Hitchc. S. bicolor (L.) Moench], revealed a quantitative
trait locus (QTL), FlrAvgD1, accounting for 85.7% of variation in flowering time under long days. Fine-scale genetic
mapping placed FlrAvgD1 on chromosome 6 within the physically largest centiMorgan in the genome. Forward genetic
data from “converted” sorghums validated the QTL. Association genetic evidence from a diversity panel delineated the
QTL to a 10-kb interval containing only one annotated gene, Sb06g012260, that was shown by reverse genetics to
complement a recessive allele. Sb06g012260 (SbFT12) contains a phosphatidylethanolamine-binding (PEBP) protein
domain characteristic of members of the “FT” family of flowering genes acting as a floral suppressor. Sb06g012260
appears to have evolved 40Ma in a panicoid ancestor after divergence from oryzoid and pooid lineages. A speciesspecific
Sb06g012260 mutation may have contributed to spread to temperate regions by S. halepense (“Johnsongrass”),
one of the world’s most widespread invasives. Alternative alleles for another family member, Sb02g029725 (SbFT6),
mapping near another flowering QTL, also showed highly significant association with photoperiod response index
(P¼1.53 10 6). The evolution of Sb06g012260 adds to evidence that single gene duplicates play large roles in important
environmental adaptations. Increased knowledge of Sb06g012260 opens new doors to improvement of sorghum
and other grain and cellulosic biomass crops.
 
Date 2016-06-22
2017-03-15T04:07:53Z
2017-03-15T04:07:53Z
 
Type Journal Article
 
Identifier http://oar.icrisat.org/id/eprint/9598
https://mel.cgiar.org/reporting/download/hash/7xnAslx5
Hugo Cuevas, Chengbo Zhou, Haibao Tang, Prashant Khadke, Sayan Das, Yann-rong Lin, Zhengxiang Ge, Thomas Clemente, Hari D. Upadhyaya, Charles Hash, Andrew H. Paterson. (22/6/2016). The Evolution of Photoperiod-Insensitive Flowering in Sorghum, A Genomic Model for Panicoid Grasses. Molecular Biology and Evolution, 33 (9), pp. 2417-2428.
https://hdl.handle.net/20.500.11766/6488
Open access
 
Language en
 
Rights CC-BY-NC-4.0
 
Format PDF
 
Publisher Oxford University Press (OUP)
 
Source Molecular Biology and Evolution;33,(2016) Pagination 2417,2428