Assembly of yield heterosis of an elite rice hybrid is promising by manipulating dominant QTLs

2022 ◽  
Author(s):  
Guojing Shen ◽  
Wei Hu ◽  
Xianmeng Wang ◽  
Xiangchun Zhou ◽  
Zhongming Han ◽  
...  
Keyword(s):  
Rice Hybrid

High-quality genome assembly of Huazhan and Tianfeng, the parents of an elite rice hybrid Tian-you-hua-zhan

2021 ◽  
Author(s):  
Hui Zhang ◽  
Yuexing Wang ◽  
Ce Deng ◽  
Sheng Zhao ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Genome Assembly ◽  
High Quality ◽  
Rice Hybrid ◽  
High Quality Genome

Contrasting yield formation characteristics in two super-rice hybrids that differ in growth duration

2021 ◽  
pp. 1-10
Author(s):  
Min Huang ◽  
Zui Tao ◽  
Tao Lei ◽  
Fangbo Cao ◽  
Jiana Chen ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Biomass Production ◽  
Field Experiments ◽  
Crop Improvement ◽  
Total Biomass ◽  
Growth Duration ◽  
Area Index ◽  
Rice Hybrid ◽  
Use Efficiency ◽  
Yield Formation

Summary The development of high-yielding, short-duration super-rice hybrids is important for ensuring food security in China where multiple cropping is widely practiced and large-scale farming has gradually emerged. In this study, field experiments were conducted over 3 years to identify the yield formation characteristics in the shorter-duration (∼120 days) super-rice hybrid ‘Guiliangyou 2’ (G2) by comparing it with the longer-duration (∼130 days) super-rice hybrid ‘Y-liangyou 1’ (Y1). The results showed that G2 had a shorter pre-heading growth duration and consequently a shorter total growth duration compared to Y1. Compared to Y1, G2 had lower total biomass production that resulted from lower daily solar radiation, apparent radiation use efficiency (RUE), crop growth rate (CGR), and biomass production during the pre-heading period, but the grain yield was not significantly lower than that of Y1 because it was compensated for by the higher harvest index that resulted from slower leaf senescence (i.e., slower decline in leaf area index during the post-heading period) and higher RUE, CGR, and biomass production during the post-heading period. Our findings suggest that it is feasible to reduce the dependence of yield formation on growth duration to a certain extent in rice by increasing the use efficiency of solar radiation through crop improvement and also highlight the need for a greater fundamental understanding of the physiological processes involved in the higher use efficiency of solar radiation in super-rice hybrids.

scholarly journals Divergent selection and genetic introgression shape the genome landscape of heterosis in hybrid rice

2020 ◽  
Vol 117 (9) ◽  
pp. 4623-4631 ◽  
Author(s):  
Zechuan Lin ◽  
Peng Qin ◽  
Xuanwen Zhang ◽  
Chenjian Fu ◽  
Hanchao Deng ◽  
...  
Keyword(s):  
Hybrid Rice ◽  
Field Trials ◽  
Hybrid Breeding ◽  
Genetic Introgression ◽  
Rice Varieties ◽  
Rice Landraces ◽  
Rice Hybrid ◽  
Negative Effect ◽  
Two Populations ◽  
Positive Effect

The successful application of heterosis in hybrid rice has dramatically improved rice productivity, but the genetic mechanism for heterosis in the hybrid rice remains unclear. In this study, we generated two populations of rice F1hybrids with present-day commercial hybrid parents, genotyped the parents with 50k SNP chip and genome resequencing, and recorded the phenotype of ∼2,000 hybrids at three field trials. By integrating these data with the collected genotypes of ∼4,200 rice landraces and improved varieties that were reported previously, we found that the male and female parents have different levels of genome introgressions from other rice subpopulations, includingindica,aus, andjaponica, therefore shaping heterotic loci in the hybrids. Among the introgressed exogenous genome, we found that heterotic loci, includingGhd8/DTH8,Gn1a, andIPA1existed in wild rice, but were significantly divergently selected among the rice subpopulations, suggesting these loci were subject to environmental adaptation. During modern rice hybrid breeding, heterotic loci were further selected by removing loci with negative effect and fixing loci with positive effect and pyramid breeding. Our results provide insight into the genetic basis underlying the heterosis of elite hybrid rice varieties, which could facilitate a better understanding of heterosis and rice hybrid breeding.

Abnormal PMC microtubule distribution pattern and chromosome behavior resulted in low pollen fertility of an intersubspecific autotetraploid rice hybrid

2010 ◽  
Vol 291 (3-4) ◽  
pp. 257-265 ◽  
Author(s):  
Jin-Hua He ◽  
Muhammad Qasim Shahid ◽  
Zhi-Xiong Chen ◽  
Xing-An Chen ◽  
Xiang-Dong Liu ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Pollen Fertility ◽  
Chromosome Behavior ◽  
Autotetraploid Rice ◽  
Rice Hybrid
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