Exploiting interspecific heterosis between African rice and Asian rice

Sun, Yuena; He, Wenchuang; Xie, Yi; Zhao, Wubin; Tan, Jingfa; Yang, Xu; Dang, Tengfei; Dong, Xilong; Xi, Kun; Liu, Yuhong; Ya-lin, HU; Efisue, Andrew; Jiang, Deming

doi:10.1002/csc2.20224

Cited by 4 publications

(10 citation statements)

References 37 publications

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“…Because molecular markers have been implemented by breeding programmes more than 35 years ago (Stuber et al, 1982), extensive research has been devoted to the study of associations between heterosis and genetic divergence of lines based on markers. In some studies, a positive correlation between line diversity and hybrid heterosis has been reported (Larièpe et al, 2017; Sun et al, 2020), and in some studies, low associations have been described (Dikshit & Swain, 2000; Oliboni et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Adding genome‐wide genotypic information to a tobacco (Nicotiana tabacum) breeding programme

Carvalho¹,

Lewis

Bruzi

et al. 2022

Plant Breeding

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Large‐scale genotypic information can be used to increase genetic gain in plant breeding programmes. In this research, we evaluated the following: (i) statistical models that could be useful in selection of superior tobacco genotypes in absence of phenotypic information; (ii) the applicability of genome‐wide selection (GWS) for predicting tobacco hybrid performance, and (iii) correlations between genetic divergence of parental lines and F1 hybrid performance. We crossed 13 inbred lines of flue‐cured Virginia tobacco crossed in a diallel scheme to generate 72 hybrid combinations and evaluated them in two field environments. Genotype by sequencing was used for single nucleotide polymorphism (SNP) marker generation, and prediction model validation was performed with different levels of missing information. Hybrid performance was predicted using only the genotypic and phenotypic information. We found genetic divergence among lines to be uncorrelated with hybrid performance or heterosis. Genotype × environment interaction affects GWS efficiency, however, and an index that incorporates both genotypic and phenotypic information improves selection accuracy. Tobacco hybrid prediction utilizing GWS data can be used as additional information to increase the response to selection.

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Section: Discussionmentioning

confidence: 99%

Adding genome‐wide genotypic information to a tobacco (Nicotiana tabacum) breeding programme

Carvalho¹,

Lewis

Bruzi

et al. 2022

Plant Breeding

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“…Recent research demonstrated an example to overcome the inter-subspecies hybrid sterility (Guo et al, 2016), which greatly enhanced the confidence in the utilization of inter-subspecific heterosis between indica and japonica. The interspecific genetic difference between O. sativa and its relatives (including another cultivated species O. glaberrima) is greater than inter-and intra-subspecies, which show stronger hybrid vigor (Hu et al, 2002;Sun et al, 2020). Previous studies demonstrated that genetic knowledge about interspecific hybrid sterility can help us overcome this obstacle between O. sativa and its relatives (Deng et al, 2010;Xie et al, 2017;Yu et al, 2018).…”

Section: Understanding and Overcomingmentioning

confidence: 99%

Interspecific Hybridization Is an Important Driving Force for Origin and Diversification of Asian Cultivated Rice Oryza sativa L.

Zhou

Yang

et al. 2022

Front. Plant Sci.

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As one of the most important crops, Asian cultivated rice has evolved into a complex group including several subgroups adapting various eco-climate-systems around the globe. Here, we pictured a comprehensive view of its original domestication, divergences, and the origin of different subgroups by integrating agriculture, archeology, genetics, nuclear, and cytoplasm genome results. Then, it was highlighted that interspecific hybridization-introgression has played important role in improving the genetic diversity and adaptation of Oryza sativa during its evolution process. Natural hybridization-introgression led to the origin of indica, aus, and basmatic subgroups, which adapted to changing cultivated environments, and produced feral weedy rice coexisting and competing with cultivars under production management. Artificial interspecific hybridization-introgression gained several breakthroughs in rice breeding, such as developing three-line hybrid rice, new rice for Africa (NERICA), and some important pest and disease resistance genes in rice genetic improvement, contributing to the stable increase of rice production to meet the expanding human population. We proposed a series to exploit the virtues of hybridization-introgression in the genetic improvement of Asian cultivated rice. But some key issues such as reproductive barriers especially hybrid sterility should be investigated further, which are conducive to gene exchange between cultivated rice and its relatives, and even is beneficial to exploiting interspecific hybrid vigor. New technologies help introduce favorable genes from distant wild species to Asian cultivated rice, such as transgenic and genome editing systems. Rising introgression lines in a wider range with multi-donor benefits allele mining, understanding genetic network of rice growth and development, yield formation, and environmental adaptation. Then, integration of new tools and interspecific hybridization can be a future direction to develop more usable breeding populations which can make Asian cultivated rice more resilient to the changing climate and world.

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“…The molecular mechanism of heterosis still remains mysterious despite research on heterosis for more than a century. Unfolding research ndings indicate the potential to improve heterosis by exploiting inter-speci c heterosis between African rice and Asian rice 45 , differential expression of genes 46 , divergent selection and genetic introgression 47 , genomic hybrid breeding using whole genome markers 48 , epistasis interactions between select parents 49 , chromosome-segment substitution lines 47 , heterotic loci from wild Oryza longistaminata for yield heterosis 50 , wide compatible neo-tetraploid rice line with long panicles 51 and genome wide transcriptome pro ling of O. ru pogon 52 .…”

Section: Unsettled Issuesmentioning

confidence: 99%

Grain Yield Performance of Hybrid Rice in Multi-Environment Tests for Thirty-two Years in India

Muralidharan¹,

Prasad²,

Rao³

et al. 2020

Preprint

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Background: Hybrid F1genotypes with higher yields or improvement in other traits of economic value due to heterosis as compared to inbred local check varieties (ILCV), are identified and released as hybrid commercial varieties. We analyzed the yield data of 2070 hybrid F1 genotypes with ILCV evaluated over 32 years (1988 to 2019) in 2376 multi-environment experiments executed at 102 locations in the irrigated ecosystem across India. Results: The genetic gain or loss in yield of hybrid F1 genotypes estimated over the test duration was non-significant. Hybrid F1 genotypes produced 10% more grains (728-2588 kg/ha) than ILCV in many experiments at several locations. Our analyses have established that grain yields of 7.0 to 7.9 t/ha, were harvested in hybrid F1 genotypes with early, mid-early and medium maturity duration, and in those with medium slender grains at many locations in 362 experiments. A higher level of rice productivity per day (62 to 63 kg/ha) was recorded with the early maturing and mid-early maturing hybrid F1 genotypes in these tests. The N requirement to produce 8 t/ha of hybrid rice grains was 15 kg N/t as compared with a minimum of 20 kg N/t used in China. Both the hybrids and inbreds in these experiments produced grain yields that were easily attained previously with high yielding (≥10 t/ha) commercial inbreds since 1968. Unless the attainable yields are reached in inbred checks with the proven appropriate crop production practices in an experiment, it is futile to estimate a genetic gain or loss for grain yields in new genotypes developed.Conclusions: Hybrid genotypes bred in India produced yields of 7 to 8 t/ha which matched with reports from China on hybrids and green super rice; these India-bred hybrids showed higher productivity per day and shorter maturity periods than super hybrids of China. Opportunities still exist to breed indica/japonica hybrids to obtain more heterotic early and mid-early maturing hybrids, and develop efficient agronomical practices to realize the potential advantages from hybrids. There is scope for breeders to limit test locations to represent specific target areas to avoid data loss. Focusing on removing obstacles in hybrid seed production is essential to exploit yield heterosis in hybrids, and to make hybrid rice technology profitable to farmers.

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Exploiting interspecific heterosis between African rice and Asian rice

Cited by 4 publications

References 37 publications

Adding genome‐wide genotypic information to a tobacco (Nicotiana tabacum) breeding programme

Adding genome‐wide genotypic information to a tobacco (Nicotiana tabacum) breeding programme

Interspecific Hybridization Is an Important Driving Force for Origin and Diversification of Asian Cultivated Rice Oryza sativa L.

Grain Yield Performance of Hybrid Rice in Multi-Environment Tests for Thirty-two Years in India

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