Chinese Journal of Rice Science 

About: Chinese Journal of Rice Science is an academic journal. The journal publishes majorly in the area(s): Population & Panicle. It has an ISSN identifier of 1001-7216. Over the lifetime, 1273 publications have been published receiving 5130 citations.

Restriction fragment length polymorphism in rice.

Abstract: Eight genotypes of cultivated (Oryza sativa L.)and wild rice (Oryza glumaepatula)were surveyed for restriction fragment length polymorphisms (RFLPs) using 9 probes and 4 endonucteases, all together 19 probe / enzyme combinations. Results indicated that RFLPs existed generally in rice. The RFLPs were more obvious between subspecies than within the subspecies.The RFLPs between cultivated and wild rice were obvious. The RFLPs between japonica and wild rice were the greatest, which were 58-68%. Nei's average gene diversity was used as a measure of genetic variability for restriction fragment lengths within genotypes and a dendrogram was constructed from genetic distance estimates between genotypes. Genotypes of japonica and indica were grouped respectively. The indica was closer relative of wild rice than japonica. The javaniea variety Ketan Nangka, which showed wide compatibility, was more closer to indica.

Pollen Development and Its Stages in Rice (Oryza sativa L.)

Abstract: By using techniques of intact fresh anther observation, isolated male cell observation and semi thin section, an extensively cytological study was conducted on the pollen development of IR36, an indica cultivar The results showed that the wholly developmental process could be tentatively divided into eight stages, ie microspore mother cell formation stage, microspore mother cell meiosis stage,early microspore stage, middle microspore stage, late microspore stage, early bicellular pollen stage,late bicellular pollen stage and mature pollen stage The experiment proved that there was not contraction stage in naturally developmental process of the microspores During the pollen developing, the tapetal cells underwent three types of morphological changes, which help to identify the stages of pollen development

Mapping QTLs for Heat Tolerance and Correlation between Heat Tolerance and Photosynthetic Rate in Rice

Abstract: A double haploid (DH) population derived from a cross between Azucena (japonica) and IR64 (indica), was used for detecting additive effect(A) of quantitative trait loci(QTL) and their additive×additive epistasis(AA) for rice heat tolerance under field and greenhouse experiments. Seed setting rate of 109 DH lines was scored as the parameter of heat tolerance. QTL analysis was conducted by using the constructed molecular linkage map and software QTLmapper 1.0. Six additive effect QTLs were detected on chromosome 1,3,4,8 and 11, respectively. Eight pairs of epistasis effects QTLs were detected on chromosome 1,2,3,4,5,7,8 and 11 with variance explained being 2.27%-8.13%. Photosynthetic rate and heat tolerance were measured at maximum tillering and heading stage, and results showed that photosynthetic rate at heading stage was significantly positive correlated with heat tolerance.

Quantitative Trait Loci and Epistatic Analysis of Seed Anoxia Germinability in Rice (Oryza sativa)

Abstract: Anoxia germinability (AG) of 35 rice varieties was evaluated under different temperature and water submergence conditions. The shoot (including coleoptile) length of seedlings germinating under 30℃, 0.2 m water submergence for 5 days could be used as an optimal criterion for the AG evaluation of all the varieties. Differences were observed among the AGs of 359 varieties from different regions and subspecies with the optimized method. Moreover, 81 recombinant inbred lines derived from a cross of Kinmaze (japonica)/DV85 (indica) were used to detect quantitative trait loci (QTLs) conferring AG. A total of five QTLs for AG in the recombinant inbred population were detected on chromosomes 1, 2, 5 and 7, respectively. Phenotypic variations explained by each QTL ranged from 10.5% to 19.6%. Based on the directions of the additive effects, the alleles at three loci qAG-1, qAG-2 and qAG-7 from Kinmaze increased AG, while alleles at loci qAG-5a and qAG-5b from DV85 increased AG. Meanwhile, three pairs of epistatic loci were found to be located on chromosomes 2, 3, 5 and 11 with significant effects ranging from 16.7% to 48.8%, and the highest one 48.78%, was detected between C563-X182 on chromosome 3 and R830-X208 on chromosome 5.

A Review on the Hyper-Susceptibility of Chinese Hybrid Rice to Insect Pests

Abstract: Highly susceptible Chinese hybrid rice gave significant impact on the insect pest ecology. The brown planthopper (BPH), Nilaparvata lugens, and the whitebacked planthopper (WBPH), Sogatella furcifera, have raised as the most prominent outbreak-prone pests of Chinese hybrid rice. Although WBPH was only a secondary insect pest of rice in China before 1970s, it increased greatly in the hybrid rice areas in 1980s. WBPH also became an economic insect pest of japonica rice in Central China due to its massive displacement from hybrid rice area in South China. BPH was temporally suppressed by the hybrid rice with the Bph 1 gene for BPH-resistance. However, the BPH adapted to them by shifting biotype, when the resistant hybrid rice spread over the insect migration zone in South- and Central China. After 1990, previously BPH-resistant hybrid rice became highly susceptible to BPH. Lack of major genes for resistance does not account enough for the hyper- susceptibility of Chinese hybrid rice to the planthoppers. Heterotic vigorous growth of hybrid rice might be partially responsible for the enhanced fecundity of the planthoppers. Hyper-susceptibility of Chinese hybrid rice to the rice planthoppers is primarily inherited from the WA-CMS lines. Thus, CMS lines are needed to improve insect pest resistance in hybrid rice. Utilization of durable and multi-resistant IR varieties like IR64 as restorer lines might be an alternative approach to improve hyper-susceptibility of Chinese hybrid rice to insect pests.The striped stemborer, Chilo suppressalis and the yellow stemborer, Scirpophage incertulas also increased on Chinese hybrid rice, which is more favorable as their food plants and more tolerant to their infestations than inbred rice. Yield loss assessments, with special reference to the plant compensation to the stemborer infestation, and ecological interactions between stemborers and hybrid rice are needed to evaluate actual impact of and practical field resistance to stemborers in hybrid rice.