Retreat of catabolites of filaments,lodicules,and stigma cells in rice

The lodicules expand rapidly when the rice florets are opening, and the filaments elongate and the stigmas extend and bend. All these growing movements are caused by the cell elongation or expansion after water absorption. The lodicules, filaments, and stigma will wither after flowering, but the cause of the withering remains unknown. In some wild abortive male sterile lines, the closing of florets     

Relationship of egg parasitoids of rice planthoppers between rice and non-rice habitats

Egg parasitoids, Anagrus spp. and Oligositaspp. have been found to be important biological agents in suppressing rice planthoppers in Asian countries. However, most of these studies have been confined to conditions within rice fields. In this study, field surveys were made to study the floral and faunal diversity in various habitats surrounding rice fields. The rice and grass (Echinochloa spp.) plants were infested with 2 gravid females of brown planthopper Toya spp. or T. pusanus per tiller respectively for two days. The oviposited plants were:1) Rice plants bearing BPH eggs, 2) grass plants bearing BPH eggs, 3) grass plants bearing Toya spp eggs, and 4) grass plants bearing T. pusanus eggs. Above plants were placed in the rice field, the grassy area adjacent to rice fields and the grassy area away from rice fields, respectively. Potted plants with host     

Effects of EGF on seed-setting and yield of rice

Intersubspecies hybrid rice have strong heterosis but low seed-setting rate, Researches have showed that most of unfilled and partiallyfilled grains occurred in late-flowering spikelets on the base of a panicle, which usually maintain quiescent state for a period after flowering.     

Compound pollution of Cd, Pb, Cu, Zn, and As on lowland rice

Cd, Pb, Cu, Zn, and As are typical pollutants originated from Pb-Zn mine, smelting waste water discharge/irrigation and gas emission,and they were distributed widely in China. We studied the compound pollution of Cd, Pb,Cu, Zn, and As on rice.     

Long range migration of rice planthoppers and associated meteorological conditions in Yulin,Ganzhou,and Huangyan

In recent years ,it has been demonstrated that the low-level jet streams (LLJs) developed in the south of the Meiyu(Baiu) front play a critical role in the overseas migrations of the planthoppers into Japan and Korea. However, the involement of the LLJs during the process of sequential displacements of rice planthoppers in China has not been clarified yet. In the present studies, the synoptic meteorological factors including LLJs associated with the     

Production and identification of salt-tolerant transgenic rice plants

Ｔｏｒｅｌｉｅｖｅｔｈｅｄａｍａｇｅｏｆｓａｌｔｔｏｔｈｅｃｅｌｌ，ｍａｎｙｐｌａｎｔｓａｃ ｃｕｍｕｌａｔｅｄｓｏｍｅｌｏｗ＿ｍｏｌｅｃｕｌａｒｗｅｉｇｈｔｏｒｇａｎｉｃｃｏｍｐｏｕｎｄｓ，ｗｈｉｃｈｗｅｒｅｃａｌｌｅｄｏｓｍｏｐｒｏｔｅｃｔａｎｔ，ｓｕｃｈａｓｂｅｔａｉｎｅ，ｍａｎ ｎｉｔｏｌ，ａｎｄｓｏｒｂｉｔｏｌ．Ｔｈｅｒｅｆｏｒｅｉｆｔｈｅｇｅｎｅ＿ｅｎｃｏｄｉｎｇｅｎｚｙｍｅｒｅｓｐｏｎｓｉｂｌｅｆｏｒｓｙｎｔｈｅｓｉｚｉｎｇｔｈｅｏｓｍｏｐｒｏｔｅｃｔａｎｔｗａｓｔｒａｎｓ ｆｏｒｍ…     

Origin and cultivation history of rice in China

According to the documental accounts, the distribution of wild rice (O.perennis), the ancestor species of cultivated rice in ancient China is possibly more northward than in the modern times. The earliest rice grains unearthed from the Neolithic sites existed along the lower and middle reaches of the Yangtze River.     

Correlations between ultrastructure and photosynthesis in leaves of rice and barnyard-grass

The ultrastructure of the leaves of rice(Oryza sativa)and barnyardgrass(Echinochloa crus-galli)in their milking stage were studied withelectron microscopy.The content of chloro-     

Effects of S3307 on the photosynthesis,the activity of SOD,and MDA content of rice flag leaf

Ｕｎｉｃｏｎａｚｏｌ，（Ｅ）＿１＿（４＿ｃｈｌｏｒｏｐｈｅｎｙｌ）＿４，４＿ｄｉｍｅｔｈｙｌ＿２（１，２，４＿ｔｒｉａｚｏｌ＿ｌ＿ｙｌ）＿１＿ｐｅｎｔｅｎ＿３＿０１，ｎａｍｅｄＳ３３０７，ｉｓａｎｅｗｐｌａｎｔｇｒｏｗｔｈｒｅｔａｒｄａｎｔｔｈａｔｃａｎｒｅｔａｒｄｔｈｅ ｇｒｏｗｔｈｏｆ ｐｌａｎｔｓ，ｍａｋｅ ｐｌａｎｔｄｗａｒｆ，ｐｒｏｍｏｔｅｒｏｏｔａｎｄｔｉｌｌｅｒｇｒｏｗｔｈ，ｄｅｌａｙｔｈｅｓｅｎｅｓｃｅｎｃｅｏｆｌｅａｖｅｓ，ａｎｄｉｎｃｒｅａｓｅｔｈｅｎｅｔｐｈｏｔｏ ｓｙｎｔｈｅ…     

Identification of rice varieties tolerant to photooxidation and shading

Long time exposure of rice plants to strong light will cause leaves chlorosis due to photooxidation,while the long time exposure to weak light will do them shading. Six varieties-indica hybrid rice Shanyou 63 and its parents Minghui 63 and Zhenshan 97A, indica-japonica hybrid rice Yayou 2 and its parents 02428 and 3037-were identified for their sensibility to photooxidation and shading at the stem elongation stage.     

Effects of yield and resistances on rice by application of Si-fertilizer

According to the analysis of 654 soil samples collected from 45 counties in Zhejiang Provence, 73.7% of paddy field showed Si deficient. During 1991 and 1993, in Lishi, Longquang, Qingtian and Tonglu Counties, field experiments were conducted to test the effects of basal or additional Si-fertilizer on rice. Si-fertilizer was produced by Nanjing Inorganic Chemical Manufacture, containing 50% water solu     

Discovery of Sichuan apomixis rice and its biological characters

In the spring of 1988, we discovered some male sterile plants with high seed-setting rates in two lines from the F7 of cross, Fan 4 / Zhongdan 2 // Zhenshan 97, at Hainan Province, South China. At first, these plants were suspected to be photoperiod sensitive male sterile plants, Through observation in several generations,     

AMMI analysis of interaction of genotype and environment in chalkiness of indica rice

Chalkiness is an unpleasant trait for rice con-sumer. which is known to be controlled geneti-cally and affected by environment during grainmaturing. We used the model of Additive MainEffects and Multiplieative Interaction (AMMI)for interpreting the result of genotype by env-iornment interaction (G×E) in the chalkinessof indica rice varieties.     

The discovery of an Est locus related to the origin, evolution and classification of Asian rice

In the isozyme studies concerning the origin and evolution of Asian rice, Morishima(1990) pointed out that, so far, there have been about 20 isozyme loci related to the differentiation of indica and japonica. In 1990, we discovered another Est locus related to the origin, evolution and classification of Asian rive. Genetic studies revealed that there were 5 multiple alleles on this locus represented 4 isozyme bands,     

Relationships between zeatin and zeatin riboside contents and grain filling of rice

Zeatin(Z)and zeatin riboside(ZR)are natu-rally-occurring and predominant transportablecytokinins in some higher plants.In thisstudy,the total contents of Z and ZR weremeasured in grains and roots,respectively,and their relationship with grain filling wereanalyzed.The grain filling percentage(GFP)and fertilized-grain filling percentage(FGFP)of rice cultivars IR72,IR 65600-42-5-2,IR65600-127-2-3,and IR 65598-112-2 grown infield and cultivars IR72,IR57298-174-1-1R,     

Effects of field high temperature on grain yield and quality of a subtropical type japonica rice—Pon-Lai rice

Typical japonica type rice is sensitive to high temperature. Pon-Lai rice is a special japonica type with adaptation to the subtropical climate in Taiwan. Facing climate change, rising temperatures would damage the yield and quality of rice production. This research was conducted using Pon-Lai rice in the field of a subtropical climate. We conducted 2 experiments, including a year-round experiment and collection of samples from different districts for building different temperature conditions. We analyzed the correlation between rising temperature and rice yield or quality. In our results, the critical period of temperature effect is 0–15 days after heading (H15). The threshold of high temperature damage in yield and appearance quality was 25–27 °C. Grain weight decreased about 2–6%, while the temperature of H15 was raised 1 °C above the thresholds. Perfect grain ratio and chalky grain ratio decreased and increased, respectively, while the temperature of H15 was raised above the thresholds. However, the high temperature in H15 affected the physicochemical characteristics. In addition, we found positive correlation between grain length to width ratio and perfect grain ratio. Grain length to width ratio could be an index of temperature effects for grain quality. In our study, when the temperature was below 30 °C, a rising temperature of H15 could damage rice yield and appearance quality, and change grain shape. Our results could provide reference for dealing with the warming future in other temperate rice-cultivated countries.     

Construction of ammonium-tolerant strains of diazotroph associated with rice and its applications

In rice field, especially in the fertilized field the combined nitrogen content is rather high. It is well known that the nitrogen compounds, particularly NH4^ inhibits the nitrogenase activity- of diazotrophs. So, the enhancement of nitrogen fixation ability of diazotrophs in the presence of ammonia by means of genetic manipulation will be of importance for agricultural use.     

Bumper harvest of super rice in south and north China

Ｒｅｃｅｎｔｌｙ，ａｇｒｅａｔｐｒｏｇｒｅｓｓｗａｓｍａｄｅｉｎｂｒｅｅｄｉｎｇａｎｄｃｕｌ ｔｉｖａｔｉｏｎｏｆｓｕｐｅｒｒｉｃｅｉｎＣｈｉｎａ．ＴｈｅＳｏｕｔｈＤｅｍｏｎｓｔｒａｔｉｏｎＡｃｃｅｐｔａｎｃｅＭｅｅｔｉｎｇｏｆＣｈｉｎａＳｕｐｅｒＲｉｃｅｗａｓｈｅｌｄｉｎＯｃｔ１７，２０００ｉｎＸｉｎｃｈａｎｇＣｏｕｎｔｙ，ＺｈｅｊｉａｎｇＰｒｏｖｉｎｃｅ．ＹｉｅｌｄｍｏｎｉｔｏｒｉｎｇｇｒｏｕｐｏｒｇａｎｉｚｅｄｂｙｔｈｅＤｅｐａｒｔｍｅｎｔｏｆＳｃｉｅｎｃｅ，ＴｅｃｈｎｏｌｏｇｙａｎｄＥｄ…