Genome Resequencing for Autotetraploid Rice and Its Closest Relatives Reveals Abundant Variation and High Potential in Rice Breeding.

Polyploid rice and its reverted diploid show rich phenotypic variation and strong heterosis, showing great breeding value. However, the genomic differences among tetraploids, counterpart common diploids, tetraploid-revertant diploids, and hybrid descendants are unclear. In this work, we bred a new excellent two-line hybrid rice variety, (HTRM12), using Haitian tetraploid self-reverted diploid (HTRM2).

Regulates Grain Quality, Gene Expressions, and Regulatory Networks of Starch and Storage Protein Metabolisms in Rice.

plays a vital role in regulating floret development and grain shape, but whether it regulates rice grain quality still remains largely unknown. Therefore, we used comprehensive molecular genetics, plant biotechnology, and functional omics approaches, including phenotyping, mapping-by-sequencing, target gene seed-specific RNAi, transgenic experiments, and transcriptomic profiling to answer this biological and molecular question. Here, we report the characterization of the 'Oat-like rice' mutant, with poor grain quality, including chalky endosperms, abnormal morphology and loose arrangement of starch granules, and lower starch content but higher protein content in grains.

Cell Wall Matrix Polysaccharides Contribute to Salt-Alkali Tolerance in Rice.

Salt-alkali stress threatens the resilience to variable environments and thus the grain yield of rice. However, how rice responds to salt-alkali stress at the molecular level is poorly understood. Here, we report isolation of a novel salt-alkali-tolerant rice (SATR) by screening more than 700 germplasm accessions.

Characterization of the 'Oat-Like Rice' Caused by a Novel Allele OsMADS1 Reveals Vital Importance of OsMADS1 in Regulating Grain Shape in Oryza sativa L.

Background: Grain shape is a critical agronomic trait affecting grain yield and quality. Exploration and functional characterization of grain shape-related genes will facilitate rice breeding for higher quality and yield.

Results: Here, we characterized a recessive mutant named Oat-like rice for its unique grain shape which highly resembles oat grains.

Proteomic Analysis of Rice Subjected to Low Light Stress and Overexpression of OsGAPB Increases the Stress Tolerance.

Background: Light provides the energy for photosynthesis and determines plant morphogenesis and development. Low light compromises photosynthetic efficiency and leads to crop yield loss. It remains unknown how rice responds to low light stress at a proteomic level.

Microsatellite analysis of genetic variation and population genetic differentiation in autotetraploid and diploid rice.

Genetic diversity and population genetic structure of autotetraploid and diploid populations of rice collected from Chengdu Institute of Biology, Chinese Academy of Sciences, were studied based on 36 microsatellite loci. Among 50 varieties, a moderate to high level of genetic diversity was observed at the population level, with the number of alleles per locus (Ae) ranging from 2 to 6 (mean 3.028) and polymorphism information content ranging from 0.

[Wx sequence analysis of a autotetraploid indica mutant rice and establishment of molecular marker for identifying].

The amylose content of the mutant of autotetraploid indica rice D4063-1 is 5.23% anout, which was half of its origin diploid rice Minghui 63. The whole sequence of Waxy gene of D4063-1 was amplified and sequenced.

[Cytogenetical comparison of restorers TP-4 and D minghui63 and maintainer D46B of autotetraploid rice].

Cytogenetical comparison was made between high seed set restorers TP-4 and D minghui63 and eminent maintainer line D46B of autotetraploid rice. The meiosis observation demonstrated the genomes of our autotetraploid materials were all 2n = 48, the same as those in mitosis observation. Low percentages of univalent and trivalent in metaphase I (MI) of restorers TP-4 and D minghui63 and in metaphase I (MI) of maintainer line D46B of autotetraploid rice were observed.