Linkage mapping and association analysis to identify a reliable QTL for stigma exsertion rate in rice

Liu, Yi; Fang, Dong; Kong, Deyan; Ma, Xiaosong; Zhang, Anning; Wang, Feiming; Wang, Lei; Xia, Hui; Liu, Guolan; Xing, Yu; Luo, Lijun

doi:10.3389/fpls.2022.982240

Cited by 4 publications

(6 citation statements)

References 51 publications

(66 reference statements)

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“…It is well known that the SER of indica rice is generally higher than that of japonica rice, which leads to generally obtain higher hybrid seed yield using indica MSLs than using japonica MSLs ( Zhou et al., 2017 ; Dang et al., 2020 ; Jiang et al., 2021 ). It was found that the GS3 gene controlling grain length had a positive effect on SER ( Miyata et al., 2007 ; Li et al., 2014 ; Zhou et al., 2017 ; Xu et al., 2019 ; Liu et al., 2022 ) and GW5 and GW2 genes controlling grain width had a negative effect on SER ( Zhou et al., 2017 ). However, the pleiotropic effect of the genes controlling grain shape were not always obvious ( Zhou et al., 2017 ; Xu et al., 2019 ).…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, improving SER is the key goal of MSL breeding. In recent decades, a large number of QTLs for SER have been located in rice genome, laying a foundation for improving SER Rahman et al, 2017b;Guo et al, 2022;Liu et al, 2022). Recently, eighteen QTLs for SER from O. sativa, O. glaberrima, and O. glumaepatula were mapped in the SSSLs of the HJX74 genetic background (Tan et al, 2020;Tan et al, 2021;Tan et al, 2022a).…”

Section: The Strategy For Improving Ser In Ricementioning

confidence: 99%

“…In the past decades, dozens of quantitative trait loci (QTLs) responsible for the SER have been identified from rice germplasm resources Guo et al, 2022;Liu et al, 2022). Recently, eighteen QTLs for SER from O. sativa, O. glaberrima, and O. glumaepatula were detected in the single-segment substitution lines (SSSLs) with the Huajingxian74 (HJX74) genetic background (Tan et al, 2020;Tan et al, 2021;Tan et al, 2022a).…”

Section: Introductionmentioning

confidence: 99%

“…In the past decades, dozens of quantitative trait loci (QTLs) responsible for the SER have been identified from rice germplasm resources ( Marathi and Jena, 2015 ; Guo et al., 2022 ; Liu et al., 2022 ). Recently, eighteen QTLs for SER from O .…”

Section: Introductionmentioning

confidence: 99%

“…Among detected QTLs, major QTLs qES3 and qSER8 were demonstrated to act pleiotropic effects on grain length by controlling the longitudinal axis direction of grains ( Bakti and Tanaka, 2019 ). On the other hand, it is documented that the GS3 gene not only determines grain length ( Fan et al., 2006 ), but also acts a pleiotropic effect on stigma size ( Takano-Kai et al., 2011 ; Zhou et al., 2017 ; Dang et al., 2020 ) and stigma exsertion ( Miyata et al., 2007 ; Li et al., 2014 ; Zhou et al., 2017 ; Xu et al., 2019 ; Liu et al., 2022 ). Two cloned genes for grain width, GW5 and GW2 , were also reported to extend their effects on SER ( Zhou et al., 2017 ).…”

Section: Introductionmentioning

confidence: 99%

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Grain shape is a factor affecting the stigma exsertion rate in rice

et al. 2023

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Stigma exsertion rate (SER) is an index of outcrossing ability in rice and is a key trait of male sterile lines (MSLs) in hybrid rice. In this study, it was found that the maintainer lines carrying gs3 and gs3/gw8 showed higher SER. Single-segment substitution lines (SSSLs) carrying gs3, gw5, GW7 or gw8 genes for grain shape and gene pyramiding lines were used to reveal the relationship between grain shape and SER. The results showed that the grain shape regulatory genes had pleiotropic effects on SER. The SERs were affected by grain shapes including grain length, grain width and the ratio of length to width (RLW) not only in low SER background, but also in high SER background. The coefficients of determination (R2) between grain length and SER, grain width and SER, and grain RLW and SER were 0.78, 0.72, and 0.91 respectively. The grain RLW was the most important parameter affecting SER, and a larger grain RLW was beneficial to stigma exsertion. The pyramiding line PL-gs3/GW7/gw8 showed the largest grain RLW and the highest SER, which will be a fine breeding resource. Further research showed that the grain shape regulatory genes had pleiotropic effects on stigma shape, although the R2 values between grain shape and stigma shape, and stigma shape and SER were lower. Our results demonstrate that grain shape is a factor affecting SER in rice, in part by affecting stigma shape. This finding will be helpful for breeding MSLs with high SER in hybrid rice.

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Section: Discussionmentioning

confidence: 99%

Section: The Strategy For Improving Ser In Ricementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Grain shape is a factor affecting the stigma exsertion rate in rice

et al. 2023

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Potential roles of stigma exsertion on spikelet fertility in rice (Oryza sativa L.) under heat stress

2022

Front. Plant Sci.

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Heat stress during the flowering stage induces declining spikelet fertility in rice plants, which is primarily attributed to poor pollination manifesting as insufficient pollen deposited on the stigma. Plant pollination is associated with anther dehiscence, pollen dispersal characteristics, and stigma morphology. The mechanisms underlying the responses of spikelet fertility to heat stress have been clarified in depth in terms of the morphological and behavioral characteristics of the male reproductive organs in rice. However, the roles of female reproductive organs, especially the stigma, on spikelet fertility under heat conditions are unclear. The present study reviews the superiority of stigma exsertion on pollen receptivity under heat during the flowering stage and discusses the variations in the effects of exserted stigma on alleviating injury under asymmetric heat (high daytime and high nighttime temperatures). The pollination advantages of exserted stigmas seem to be realized more under high nighttime temperatures than under high daytime temperatures. It is speculated that high stigma exsertion is beneficial to spikelet fertility under high nighttime temperatures but detrimental under high daytime temperatures. To cope with global warming, more attention should be given to rice stigma exsertion, which can be manipulated through QTL pyramiding and exogenous hormone application and has application potential to develop heat-tolerant rice varieties or innovate rice heat-resistant cultivation techniques, especially under high nighttime temperatures.

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Hybrid Rice Production: A Worldwide Review of Floral Traits and Breeding Technology, with Special Emphasis on China

Ashraf,

Ghouri,

Baloch

et al. 2024

Plants

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Rice is an important diet source for the majority of the world’s population, and meeting the growing need for rice requires significant improvements at the production level. Hybrid rice production has been a significant breakthrough in this regard, and the floral traits play a major role in the development of hybrid rice. In grass species, rice has structural units called florets and spikelets and contains different floret organs such as lemma, palea, style length, anther, and stigma exsertion. These floral organs are crucial in enhancing rice production and uplifting rice cultivation at a broader level. Recent advances in breeding techniques also provide knowledge about different floral organs and how they can be improved by using biotechnological techniques for better production of rice. The rice flower holds immense significance and is the primary focal point for researchers working on rice molecular biology. Furthermore, the unique genetics of rice play a significant role in maintaining its floral structure. However, to improve rice varieties further, we need to identify the genomic regions through mapping of QTLs (quantitative trait loci) or by using GWAS (genome-wide association studies) and their validation should be performed by developing user-friendly molecular markers, such as Kompetitive allele-specific PCR (KASP). This review outlines the role of different floral traits and the benefits of using modern biotechnological approaches to improve hybrid rice production. It focuses on how floral traits are interrelated and their possible contribution to hybrid rice production to satisfy future rice demand. We discuss the significance of different floral traits, techniques, and breeding approaches in hybrid rice production. We provide a historical perspective of hybrid rice production and its current status and outline the challenges and opportunities in this field.

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Linkage mapping and association analysis to identify a reliable QTL for stigma exsertion rate in rice

Cited by 4 publications

References 51 publications

Grain shape is a factor affecting the stigma exsertion rate in rice

Grain shape is a factor affecting the stigma exsertion rate in rice

Potential roles of stigma exsertion on spikelet fertility in rice (Oryza sativa L.) under heat stress

Hybrid Rice Production: A Worldwide Review of Floral Traits and Breeding Technology, with Special Emphasis on China

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