Optimizing Hill Seeding Density for High-Yielding Hybrid Rice in a Single Rice Cropping System in South China

Wang, Danying; Chen, Song; Wang, Zaiman; Ji, Chenglin; Xu, Chunmei; Zhang, Xiufu; Chauhan, Bhagirath Singh

doi:10.1371/journal.pone.0109417

Cited by 40 publications

(29 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Phosphorus at 60 kg P 2 O 5 ha −1 in the form of calcium superphosphate was applied as basal. The field management was performed as described by Wang et al (2014) with slight modification. Field trials were conducted in Hangzhou (HZ) (119°54′ E, 30°04′ N) from May to October 2012.…”

Section: Methodsmentioning

confidence: 99%

Quantitative Trait Loci Mapping for Appearance Quality in Short‐Grain Rice

et al. 2016

View full text Add to dashboard Cite

Rice (Oryza sativa L.) appearance quality, as defined by both grain shape and lack of chalkiness, are key breeding goals throughout the world's rice‐producing areas. To understand the genetic effects on rice appearance quality, we grew a double‐haploid (DH) population derived from the cross between two short‐grain rice cultivars, japonica Chunjiang 06 (CJ06) and indica Taichung Native 1 (TN1), in both subtropical Hangzhou and tropical Hainan, China. Transgressive segregation was noted for all measured traits: grain length (GL), grain width (GW), length/width ratio (LW), percentage of kernels with chalk (CK), average chalk size (CS) per kernel, and chalkiness degree (CD, calculated as CK × CS). High positive correlations observed between the chalkiness measures (CK, CS, and CD) with GL and GW indicate that grain shape may have pleiotropic effects on grain chalkiness. Nineteen main‐effect QTL and nine epistatic interaction pairs were detected for grain chalkiness and shape. Quantitative trait loci (QTL) were on all 12 chromosomes and explained 8.0 to 23.6% of the phenotypic variance observed under the two environments. One chalkiness QTL and one shape QTL had main effects in both locations. However, when epistasis was considered, seven of 10 identified main‐effect regions also had epistatic effect on either grain chalkiness or shape. This demonstrated that epistasis plays an important role in determining grain chalkiness, shape, and the association between chalkiness and shape. The identified QTL and epistatic interactions provide further understanding of the genetic basis of grain appearance quality and assistance in improving grain appearance quality of rice through breeding.

show abstract

Section: Methodsmentioning

confidence: 99%

Quantitative Trait Loci Mapping for Appearance Quality in Short‐Grain Rice

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Firstly, rice was planted at a proper high density (90–100 plants/m 2 ). Seeding density is an important factor for rice yield ( Lin et al 2011 , Wang et al 2014 ). In our experience, high density seedlings can also promote rice maturation: growing rice seedlings at a proper high density always leads to the mimicking of a short-day effect, and direct planting associated with rational close planting can promote rice to flower earlier by 10–15 days than transplanting rice.…”

Section: Methodsmentioning

confidence: 99%

A practical protocol to accelerate the breeding process of rice in semitropical and tropical regions

Li¹,

Hou

Liu³

et al. 2015

Breed. Sci.

View full text Add to dashboard Cite

Breeding of excellent rice varieties is essential for modern rice production. Typical breeding procedures to introduce and maintain valuable agricultural traits require at least 8 generations from crossing to stabilization, always taking more than 4–5 years of work. This long and tedious process is the rate-limiting step in the development of new varieties, and therefore fast culturing methods are in urgent need. Taking advantage of early flowering characteristics of light-sensitive rice under short-day conditions, we have developed a practical protocol to accelerate the breeding cycle of rice, which we have termed the “1 + 2”, “2 + 2”, “1 + 3”, and “0 + 5” methods according to the different rice varieties and different breeding purposes. We have also incorporated several techniques, including glume cutting, seed desiccation at 50°C in a drier seed dormancy breakage with low concentration of HNO3, and direct seeding. Using the above strategy, we have shortened the life cycle of light-sensitive rice varieties to about 70 days, making it possible for several rice cultivars to proliferate 4–5 generations in a single calendar year. This protocol greatly accelerates the process of new variety breeding, and can be used in rice research for shortening the process of genetic analysis and the construction of mapping populations.

show abstract

“…In the study of interspecific hybrids, high-parent heterosis for GNP (8.53%) and KGW (10.47%) resulted in a positive mean of panicle yield heterobeltiosis (3.08%), despite the existence of sterile hybrids (Wang et al, 2014). In another study, the three-line super hybrid rice WFYT025 and its parents showed that high-parent heterosis for yield per plant remained highly significant (22.99%) with p < .01 (Chen et al, 2018).…”

Section: F I G U R Ementioning

confidence: 96%

Heterotic performance of the main yield traits in different types of Indica hybrid rice

Huang

Xin

et al. 2020

Food and Energy Security

View full text Add to dashboard Cite

Two‐line hybrid rice with high efficiency and yield was successfully and widely being planted in China. HHZ is an elite inbred rice which is widely cultivated in Southern China. The latest developed engineered hybrid is promising for the future of hybrid rice breeding and production. In order to explore its heterosis performance, the main yield traits of two different groups of hybrid rice varieties and a inbred variety were investigated, specifically: (1) a large‐scale extension of high‐yield varieties of two‐line hybrid rice and their parents (restorer lines), (2) a new generation of hybrid rice created by genetic engineered with HHZ as a background genome and its parental lines, and (3) a inbred indica rice variety, HHZ. We postulate that the performance of the main yield traits of genetically engineered hybrid rice may be better than that of commercial high‐yielding hybrid rice in the same paddy field. To test our assumption, field experiments were conducted to investigate the performance of the main yield traits in the different types of hybrid rice and to compare and analyze the differences of the yield heterosis traits. The hybrid rice varieties showed obvious high‐parent heterosis for effective panicle number (EPN) per hill, grain number per panicle (GNP), seed set rate (SSR), and harvest index (HI), but high‐parent heterosis for the 1000‐grain weight (KGW) was negative. Standard heterosis for GNP and KGW was found in the hybrid rice varieties, and the standard heterosis for EPN, SSR, and HI was negative. The grain number per panicle (GNP) is the largest contributor to heterotic performance. The genetically engineered hybrid rice showed similar heterotic performance to but not greater than that of two‐line hybrid rice varieties. This study provides important insights for the breeding, cultivation, and popularization of different types of hybrid rice varieties.

show abstract

Optimizing Hill Seeding Density for High-Yielding Hybrid Rice in a Single Rice Cropping System in South China

Cited by 40 publications

References 27 publications

Quantitative Trait Loci Mapping for Appearance Quality in Short‐Grain Rice

Quantitative Trait Loci Mapping for Appearance Quality in Short‐Grain Rice

A practical protocol to accelerate the breeding process of rice in semitropical and tropical regions

Heterotic performance of the main yield traits in different types of Indica hybrid rice

Contact Info

Product

Resources

About