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SYL3-k increases style length and yield of F1 seeds via enhancement of endogenous GA4 content in Oryza sativa L. pistils
Key message SYL3-k allele increases the outcrossing rate of male sterile line and the yield of hybrid F 1 seeds via enhancement of endogenous GA 4 content in Oryza sativa L. pistils. The change in style length might be an adaptation of rice cultivation from south to north in the northern hemisphere....
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Published in: | Theoretical and applied genetics 2022-01, Vol.135 (1), p.321-336 |
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Main Authors: | , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Key message
SYL3-k
allele increases the outcrossing rate of male sterile line and the yield of hybrid F
1
seeds via enhancement of endogenous GA
4
content in
Oryza sativa
L. pistils. The change in style length might be an adaptation of rice cultivation from south to north in the northern hemisphere.
The style length (SYL) in rice is one of the major factors influencing the stigma exertion, which affects the outcross rate of male sterile line and the yield of hybrid F
1
seeds. However, the biological mechanisms underlying SYL elongation remain elusive. Here, we report a map-based cloning and characterisation of the allele
qSYL3-k
. The
qSYL3-k
allele encodes a MADS-box family transcription factor, and it is expressed in various rice organs. The
qSYL3-k
allele increases SYL via the elongation of cell length in the style, which is associated with a higher GA
4
content in the pistil. The expression level of
OsGA3ox2
in pistils with
qSYL3-k
alleles is significantly higher than that in pistils with
qSYL3-n
allele on the same genome background of Nipponbare. The yield of F
1
seeds harvested from plants with 7001S
SYL3−k
alleles was 16% higher than that from plants with 7001S
SYL3−n
allele. The sequence data at the
qSYL3
locus in 136 accessions showed that alleles containing the haplotypes
qSYL3
AA
,
qSYL3
AG
, and
qSYL3
GA
increased SYL, whereas those containing the haplotype
qSYL3
GG
decreased it. The frequency of the haplotype
qSYL3
GG
increases gradually from the south to north in the northern hemisphere. These findings will facilitate improvement in SYL and yield of F
1
seeds henceforward. |
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ISSN: | 0040-5752 1432-2242 |
DOI: | 10.1007/s00122-021-03968-y |