Drought stress was studied in rice (Oryza sativa) and maize (Zea mays) to identify drought-responsive genes and associated biological processes. One experiment with rice examined drought responses in vegetative and reproductive tissues and identified drought-responsive genes in each tissue type. The results showed that brief periods of acute drought stress at or near anthesis reduced photosynthetic efficiency and ultimately lowered grain yield. Yield was reduced as a result both of fewer spikelets developed and of lower spikelet fertility. Affymetrix arrays were used to analyze global gene expression in the transcriptomes of rice vegetative and reproductive tissue. Comparative analysis of the expressed genes indicated that the vegetative and reproductive tissues responded differently to drought stress. An experiment was conducted with maize, using GS-FLX pyrosequencing to identify differentially expressed genes in vegetative and reproductive tissues; and these results were compared with those from the just-described rice transcriptome. Some of the drought-responsive genes in the maize reproductive tissue were validated by quantitative real time polymerase chain reaction (qRT-PCR). The differentially expressed genes common to both maize and rice were further analyzed by gene ontology analysis to reveal core biological processes involved in drought responses. In both species, drought caused a transition from protein synthesis to degradation, and photosynthesis was one of the most severely affected metabolic pathways. In a validating experiment, a drought-responsive transcription factor found in rice and dubbed HIGHER YIELD RICE (HYR) was constitutively expressed in rice, and the transgenic HYR plants were studied. Under well-watered conditions, the HYR plants developed higher rates of photosynthesis, greater levels of soluble sugars (glucose, fructose, and sucrose), more biomass, and higher yield. They also exhibited a drought-resistant phenotype, with higher water use efficiency, photosynthesis, and relative leaf water content under drought stress. Taken together, these studies demonstrate the potential value of newer technologies for identifying genes that might impart drought resistance and for using such genes to make crops more productive either in the presence or in the absence of drought stress. / Ph. D.

Education would always be an important issue in China. Capitalization of education wouldhave impact on housing price and rent price and affect the housing market, this can bereflected from the phenomenon of ‘over-priced school district house’. While thecapitalization of higher education on rent price is always be neglected.In that case, the propose of this study is to estimate the relationship between highereducation and rental market price level in China based on the rental market in Beijing.And the study would focus four zone in Beijing, each of them contains one to twouniversity district and surrounding non-university district.Hedonic pricing model would be used in this study to determine the impact of independentvariables on the rent price development.The result of this study indicates a complex relationship, it finds that the relationshipbetween higher education and rent price in different zones while most zones shows apositive relationship, and the overall result is insignificant. And according to our research,some target suggestions were pointed out. / Utbildning är alltid en viktig fråga i Kina. Kapitalisering av utbildningen skulle fåinverkan på bostadspris och hyrespris och påverka bostadsmarknaden, vilket kanåterspeglas från fenomenet "dyrt skolhus". Medan kapitalisering av akademisk utbildningpå hyreskostnaden alltid försummas.I det fallet är förslaget till denna undersökning att uppskatta förhållandet mellan akademiskutbildning och hyresmarknadsprisnivå i Kina baserat på hyresmarknaden i Peking. Ochstudien skulle fokusera på fyra zoner i Peking, var och en av dem innehåller ett till tvåuniversitetsdistrikt och omgivande icke-universitetsdistrikt.Hedoniska prissättningsmodell skulle användas i denna studie för att bestämma effekternaav oberoende variabler på hyresprisutvecklingen.Resultatet av denna studie indikerar ett komplicerat förhållande, det konstaterar attförhållandet mellan akademisk utbildning och hyrespris i olika zoner medan de flesta zonervisar ett positivt förhållande och det övergripande resultatet är obetydligt. Enligt vårforskning pekades några målförslag ut.