Archive

01 July 1989, Volume 3 Issue 2 Previous Issue    Next Issue
---
研究报告
研究简报


For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

研究报告

Select

Identification of the Temperature Sensitive Male-sterile Rice Sun Zongxiu,Xiong Zhenmin,Min Shaokai,Si Huamin 1989, 3(2): 49-55 .  Abstract ( )   PDF (957KB) ( )   The response to temperature and photoperiod conditions of the 5460 male-sterile line (Subsp. indica), which was claimed to be a photo period sensitive male-sterile line before, was investigated with two-way completely random design in growth chambers. The fertility of the five control cultivars (lines) were normal at all the six treatments, and the pollen fertility and the self-fertility within paper bags of 5460s were normal only at the daily max. and min. temperature 27/22℃ (weighted meanwas23.5℃) condition regardless of the pbotoperiods tested (12.0 h, 13.5 h or 15.0 h), but unnormal at the 33/28℃ (29.5℃) condition regardless of the photoperiods,it meant that most of the 5460s plants were sterile completely or in a great degree.Analysis of variance of self fertility, of the 5460s showed that difference caused by photoperiod was not significant,while that caused by temperature was very significant (P～0), the interaction between temperature and photoperiod also influenced the fertility significantly (P=1.05%). The results indicated that 5460s would not be a photoperiod sensitive male-sterile line but a “temperature sensitive” one.The actual fertility change of 5460s in Fuzhou in the summer, 1987 and the local climatological data at the same duration were analyzed. It was found that the behaviour of 5460s at the natural condition accorded with the conclusion resulted from experiments under artificial-controlled conditions. The potential value of the temperature sensitive male-sterile rice to theoratical research and breeding practice was discussed.

Select

The Rice Varietal Resistance to Whitebacked Planthopper (Sogatella furcifera) and the Relationship between the Nutrients in Rice-Plants and the Varietal Resistance Yu Xiaoping,Wu Guorui,Hu Cui 1989, 3(2): 56-61 .  Abstract ( )   PDF (407KB) ( )   This paper deals with the resistance of 6 rice varieties to whitebacked planthopper (WBPH), Sogatella furcifera Horvth at different rice ages and the relationship between the nutrients in rice sheath and the varietal resistance. The result indicated that the resistant varieties ARC10239, Rathu Heenati (RH) and the moderate resistant (MR) varieties N22, Mudgo had a significant adverse effect on WBPH's feeding survival and fecundity compared with the susceptible variety TN1; the line 9101 was suitable for the feeding and survival of WBPH but unsuitable for its ovipositing after booting.After tiilering,the resistant level of varieties, especially MR varieties N22 and Mudgo,increased progressively with the increase of plant age. There was significant negative correlation between the total nitrogen and free amino acid (mainly leucine and alanine) content in rice sheath and the resistant level of rice variety.

Select

Studies on the Character of Stigma Exsertion Among Some of Oryza Species (in English) Ying Cunshan,Zhang Shangqing 1989, 3(2): 62-66 .  Abstract ( )   PDF (249KB) ( )   A major problem in F1 hybrid seed production in rice is low levels of seed set on cytoplasmic male sterile lines. One of the approaches towards solving this problem is breed- ing for well-exserted stigmas to enhance outcrossing. In this research, we screened part of the African rice germplasm collections and breeding materials of the International Institute of Tropical Agriculture (IITA),Ibadan,Nigeria to identify lines with exceptional stigma exsertion (SE). A total of 2065 lines were examined, including 1787 Oryza sativa, 184 O. glaberrima, 66 O. barthii, 11 O. punctata, 10 O. stapfii, and 7 O. longistaminata. Of these, 1, 55, 35, 100, 20, and 86% respectively, were found to have a high degree of stigma exsertion. The 18 varieties and lines Of O. sativa were found to have exceptional stigma exsertion.The results indicate a greater probability of success in finding SE among related Oryza species and in landrace collections of O. sativa than in advanced breeding lines of O. sativa.

Select

Application of Weibull Distribution Function and Rayleigh Density Function in Established Forecast Model of BPH Population Fluctuation Huang Jianyi,Li Ruduo,Qi Lizheng,Ding Jinhua 1989, 3(2): 67-72 .  Abstract ( )   PDF (349KB) ( )   In the present paper,the Weibull distribution function Y=100×[1-exp-X/bc]} was applied to describe the probability distribution in time of eggs laid by BPH adult female, the percentage of progressive instar with the development of the nymphal inst ars,and the accumulatively hatching rate. The Rayleigh density function Y=A·X·exp (-X2/2H2)} was applied to describe the survival rate of the nymphal instars.On the basis of biological parameters obtained from foregoing function, the forecast model of BPH field population was established,and through the test of historical date,the result indicated that the simulated value of model correspond with the observed value basically.

Select

The Relation between Dormancy and Dedifferentiation of Mature Rice Seed Zhao Chengzhang,Qi Xiufang,Yu Fei 1989, 3(2): 73-76 .  Abstract ( )   PDF (264KB) ( )   The relation between dormancy and dedifferentiation of rice seed was presented in the experiment. The higher the dormant degree of rice seed.The higher the callusing frequency. When rice seeds were treated immediately after harvest by 55℃ for 4 days,or cultured on the induction medium containing 5 mg/l abscisic acid (ABA), the frequency of callusing increased obviously. The enhancement of callusing may be related to the changes of the level of endogenous hormones in explant.

Select

The Perfect Stage of Pyricularia Oryzae Cav. from Rice and Non-rice Isolate in Culture Media (in English) Shen Ying 1989, 3(2): 77-81 .  Abstract ( )   PDF (956KB) ( )   Four laboratory strains of Pyricularia oryzae cav. isolated from rice were cultivated on oatmeal agar at room temperature for 5 days and incubated at 20℃ with continuous illumination for 16 day. Mature perithecia were produced at the junction between two isolates of opposite mating type. The availability of the perfect stage in P. oryzae has offered new opportunities for understanding the genetics of Pyricularia-rice interactions which may provide insights into the breeding for durable resistance to blast.

Select

The Taxis to Acoustic Signals of Opposite Sex in Nilaparvata lugens (stal) and Sogatella furcifera (Horvath) Kong Weize,Zhang Zhitao 1989, 3(2): 82-88 .  Abstract ( )   PDF (463KB) ( )   To explore the applicability of calling behaviour in brown planthopper Nilaparvata lugens, and white backed planthopper, Sogatella furcifera, as measures for their occurrence forecast or physical control,some inducement experiments were conducted in laboratory in CNRRI. The results showed that: 1)The acoustic association transmitted through substrate (host Plant) between matured individuals of both sexes in same species is the courting signal used for recognizing and connecting with opposite sex, stimulating sex excitement,and fulfilling mating process. The tested insects could responed to the signals in a distance of about 60-80 cm and was more sensitive within 45 cm. 2)Both sexually matured males and virgen females emitted acoustic signals initiatively. The males responed to the signals of female actively and moved towards the females for mating. On the other hand,the female responed to male signals but without moving. 3)The courting signal was species specifical.Both sexes of two species only responeded to heterosexual signal of the same species respectively. 4)There was no significant difference between the reactions to real courting signal and to playback of calling record.

研究简报

Select

Cytokinin-like Effect of Topsin-M in the Rapid Test-tube Propagation of Autotetraploid Rice Clones Xiao Shuansuo,Bao Wenkui 1989, 3(2): 89-91 .  Abstract ( )   PDF (189KB) ( )

Select

Effect of Herbicide Treatments for Controlling Weed in Dry-Seeded Rice Field Yu Liuqing,R J Smith Jr,H J Black 1989, 3(2): 92-94 .  Abstract ( )   PDF (138KB) ( )

Select

Analysis on Peroxidase Isozymes in Rice Varieties Resistant and Susceptible to Rice Blast He Zuhua,Shi Chunhai,Shen Zongtan,Huang Danian,Wang Jinxia 1989, 3(2): 95-96 .  Abstract ( )   PDF (129KB) ( )