Mapping of a New Gene Wbph6（t） Resistant to the Whitebacked Planthopper, Sogatella furcifera, in Rice

A rice population consisting of 90 TN1/Guiyigu F3 lines was employed to analyze the linkage between DNA markers and a new gene Wbph6(t) conferring resistance to whitebacked planthopper, Sogatella furcifera By using the mapping approach of bulked extremes and recessive class, Wbph6(t) was mapped onto the short arm of chromosome 11 with a genetic distance of 21.2 cM to SSLP marker RM167.     

Prediction of the occurring amount of whitebacked planthopper （WBPH） on early rice by sea temperature

Whitebacked planthopper (WBPH) is a kind of long-distance migrator- pest. Its occurring amount is closely related to the climate change of large sphere. In recent years many researches have reported that the climate of large sphere was affected by the Pacific sea temperature (ST). We studied the long-range forecast of the occurring amount of WBPH by using data provided by State Meteorological Administration. China     

Expression of indica rice resistant sources to Brown planthopper（BPH） in indica-japonica hybrids and their utillzation

We studied the genetic mode in transferring BPH-resistance genes from indica varieties to japonica varieties January 1988 to December 1989 in Nanjing, Jiangsu Province. Indica varieties selected on a basis of BPH-resistance genes, i.e., Yankeng 2 (japonica), 02428 (japonica), 40316 (indica-japonica progeny),     

Resistance of transgenic rice pure lines to brown planthopper

Brown planthopper (Nilaparvata lugens, BPH) is one ofthe most damaging rice insect pests. Recent studies showedthat lectin (GNA), coded by the gna gene from snowdrop(Galanthus nivalis ) was toxic to BPH in artificial diet as-say (Powell et al, 1993, 1995). Here we report the des de-velopment of homozygous transgenic rice lines contained the gna gene and the BPH bioassay test of the homozygous lines.Mature seed-derived callus of japonica rice Fyi 105was bombarded with 2 plasmids, pWRG15…     

水稻抗白背飞虱新基因Wbph6(t)的定位初报

应用由90个株系组成的TN1/鬼衣谷F3群体,分析了水稻抗白背飞虱新基因Wbph6 (t)与DNA标记的连锁关系。应用隐性极端群体法,将[WTBX][STBX]Wbph6[WTBZ][STBZ](t)定位于第11染色体短臂,与SSLP 标记RM167的遗传距离为21.2 cM。     

RFLP and SSR mapping of a new gene for brown planthopper resistance introgressed from O. eichingeri into cultivated rice（O.sativa L.）

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Genetic Analysis and Mapping of Dominant Minute Grain Gene Mi3（t） in Rice

Grain size, determined chiefly by grain length, is one of the main factors affecting the grain yield in rice production. To study the trait of rice grain size, F1 and F2 populations were developed from crosses Shuhui 881/Y34 and Shuhui 527/Y34, and genetic analysis for minute grain was performed. The F1 populations showed minute grains, and grain size segregations in the two F2 populations were both in accordance with the ratio of 3：1, indicating that minute grain in Y34 was controlled by a completely dominant gene. By using the F2 population from Shuhui 881/Y34, this dominant gene, tentatively designated as Mi3（t）, was mapped based on SSR markers in the interval between RM282 （genetic distance of 5.1 cM） and RM6283 （genetic distance of 0.9 cM） on the short arm of chromosome 3.     

Mapping of putative sucking inhibitory gene to whitebacked planthopper by linkage analysis with CAPS markers

Resistance to whitebacked planthopper (WBPH) in Chinese japonica rice Chunjiang 06 (CJ-06) was mediated by sucking inhibitory and ovicidal mechanism. The ovicidal reponse was a common self-defense mechanism against WBPH in japonica. The ovicidal gene and its chromosomal position had already been identified. The sucking inhibitory nature of CJ-06 caused a define non-preference behavior of WBPH in fields. A single dominant gene governed the sucking inhibition in CJ-06.     

Cultivar Mixture Cooperation （CMC） of rice varieties （lines） with different blast resistant gene

We studied Cuhivar Mixture Cooperation (CMC) of rice varieties (lines) by screening mixture of rice varieties which possess different genes, 1983 1996.     

A new method to identify and improve the purity of hybrid rice with herbicide resistant gene

There is a dose relationship between the hybrid rice production and seed purity, Two-line bybrid rice with bigher beterosis is produced through the hybridization between a photothermo sensitive genetic male sterile (GMS) rice line and a paternat variety, But the fertilety of photo-thermo sensitive GMS rice line is not stable because it changes with the total climate.     

A new gamete gene locus ga14 in rice （Oryza sativa L.）

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The forecasting models of brown planthopper Nilaparvata Lugens （stol） in Zhejiang Provence

Based on the historical data over 15 years from five counties including Xiaoshan, Longyou, Pujiang, Wenling, and Huangyan, Zhejiang Province, a series of forecasting models were established by step wise regression. These models could be used to predict the population size and the level of the main endangering generation of brown planthopper(BPH) on late-season rice. After eight years validation, 73 models were established from 469 ones as a series of models used as long, medium, and short term forecasting.     

Characterization and Fine Mapping of Non-panicle Mutant （nop） in Rice

A mutant of panicle differentiation in rice called non-panicle (nop) was discovered in the progeny of a cross between 93-11 and Nipponbare. The mutant exhibits normal plant morphology but has apparently few tillers. The most striking change in nop is that its panicle differentiation is blocked, with masses of fluffy bract nodes generate from the positions where rachis branches normally develop in wild-type plants. Genetic analysis suggests that nop is controlled by a single recessive gene, which is temporarily named Nop(t). Based on its mutant phenotype, Nop(t) represents a key gene controlling the initiation of inflorescence differentiation. By using simple sequence repeat markers and sequence tagged site markers, Nop(t) gene was fine mapped in a 102-kb interval on the long arm of chromosome 6. These results will facilitate the positional cloning and functional studies of the gene.     

Study on allelism between blast resistance gene Pi-zh（t） in indica variety Zhaiyeqing 8（ZYQS） and known blast resistance gene

One blast resistance gene Pi-zh(t) from indica-variety ZYQ8 was identified using molecular markers in 1992. Studies on the allelism between gene Pi-zh(t) and known blast resis tance genes was presented in this paper.     

Fine Mapping of C（Chromogen for Anthocyanin） Gene in Rice

Seven residual heterozygous lines (RHLs) displaying different genotypic compositions in the genomic region covering probable locations of C (Chromogen for anthocyanin) gene on the short arm of rice chromosome 6 were selected from the progenies of the indica cross Zhenshan 97B/Milyang 46. Seeds were harvested from each of the seven plants, and the resultant F_2:3 populations were used for fine mapping of C gene. It was shown in the populations that the apiculus coloration matched to basal leaf sheath coloration in each plant. By relating the coloration performances of the populations with the genotypic compositions of the RHLs, the C locus was located between rice SSR markers RM314 and RM253. By using a total of 1279 F_2:3 individuals from two populations showing coloration segregation, the C locus was then located between RM111 and RM253, with genetic distances of 0.7 cM to RM111 and 0.4 cM to RM253. Twenty-two recombinants found in the two populations were assayed with seven more markers located between RM111 and RM253, including six SSR markers and one marker for the C gene candidate, OsC1. The C locus was delimited to a 59.3-kb region in which OsC1 was located.     

Identification of a RAPD marker linked to a blast resistance gene in Oryza sativa L.

Marker-aided selection has received more attention in recent years. This relies on the exploitation of close linkage between molecular markers and target gene(s). We report here a randomly amplified polymorphic DNA (RAID) marker tightly linked to the blast resistance gene Pi-11(t) derived from Hongjiaozhan, which confers the resistante to race ZBI of Pyricularia oryzae Car.