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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
Friday, 2022/01/21 | 07:57:24

Xiaojing DangYuanqing ZhangYulong LiSiqi ChenErbao LiuBingjie FangQiangming LiuDong SheZhiyao DongZhilan FanDalu LiHui WangShangshang ZhuXiaoxiao HuYanhui LiJianhua Jiang & Delin Hong

Theoretical and Applied GeneticsJanuary 2022; vol. 135: 321–336

Key message

SYL3-k allele increases the outcrossing rate of male sterile line and the yield of hybrid F1 seeds via enhancement of endogenous GA4 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 F1 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 GA4 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 F1 seeds harvested from plants with 7001SSYL3−k alleles was 16% higher than that from plants with 7001SSYL3−n allele. The sequence data at the qSYL3 locus in 136 accessions showed that alleles containing the haplotypes qSYL3AAqSYL3AG, and qSYL3GA increased SYL, whereas those containing the haplotype qSYL3GG decreased it. The frequency of the haplotype qSYL3GG increases gradually from the south to north in the northern hemisphere. These findings will facilitate improvement in SYL and yield of F1 seeds henceforward.


See https://link.springer.com/article/10.1007/s00122-021-03968-y


Fig.1: Gene structure of SYL3 and the phenotypes identification of SYL3 complementary and overexpression strains. A Gene structure of SYL3 and natural variation between the Nipponbare (SYL3-n) and Kasalath (SYL3-k) alleles. The black boxes denote exons, and the blue line denotes introns. B Pistil morphology of four independent transgenic complementary lines and Nipponbare with empty vector (EV-N) as a control. Scale bar, 1 mm. CE Comparison of the phenotype between transgenic complementary lines and EV-N. Data represent means ± SD (n = 43 independent plants). F Pistil morphology of four independent transgenic overexpression lines and SSSL14 with empty vector (EV-S) as a control. Scale bar, 1 mm. GI Comparison of the phenotype between transgenic overexpression lines and EV-S. Data represent means ± SD (n = 52 independent plants). *P < 0.05, **P < 0.01, Student’s t-test. TSSL, the sum of stigma and style length; STL, stigma length; SYL, style length

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