Comparison of Rice Yield and Evaluation Methods for Drought Resistance under Drought Stress in the Whole Growth Period and Flowering Period

[Objectives]This study was conducted to improve the drought resistance of rice and cultivate new varieties of drought-tolerant rice to effectively alleviate the reduction in rice yield caused by drought.[Methods]Twenty two indica and japonica rice varieties were tested to compare the yield differences under drought stress in the whole growth period and under drought stress in the flowering period.[Results]Drought stress in the whole growth period and flowering period significantly reduced rice yield,as well as the number of filled grains per plant,the number of filled grains per panicle and grain weight per plant.To evaluate the drought tolerance of rice varieties,relative yield could be used as the index under both drought stresses in the whole growth period and the flowering period.[Conclusions]This study provides a theoretical reference for drought-tolerant rice breeding and screening.

Advances in Research on Drought Resistance in Rice

Rice is the main grain crop in China. With global warming, drought and water shortage have become one of the important factors limiting rice production. Improving the drought resistance of rice can effectively alleviate the loss of rice yield caused by drought. In this paper, the research progress on rice drought resistance and its evaluation methods, mapping of QTLs for drought resistance-related traits, and mining for drought resistance genes were reviewed, and molecular breeding for drought resistance in rice was prospected.

Impact of residential building heating on natural gas consumption in the south of China:Taking Wuhan city as example

With the development of social economy,heating in the south of China has been concerned widely.As one of the energy sources of decentralized heating,natural gas(NG)has been used more and more popularly.This paper aimed to study the impact of residential building heating on NG consumption,and took Wuhan city,the representative city needing heating in winter of the south of China due to its location and climate,as an example.Firstly,a typical residential building model was established through DeST software.The heating load was simulated,and the corresponding NG consumption index was calculated.Secondly,appropriate methods were used to forecast the basic data of Wuhan city in 2020,including households and per capita gross national product(GDP),etc.Thirdly,the NG consumption of residential buildings with and without heating were predicted.Finally,the impact of residential building heating on NG consumption was analyzed.The results showed that the average annual household heating consumption of residential building in Wuhan city in 2020 was 2100 kWh/household,and the NG consumption using for residential building heating was 295 Nm 3/household.In addition,the NG consumption of residential building generated by space heating with 100%heating rate was 2.82 times the NG consumption generated by the stove and water heater,showing that residential building heating had a large impact on NG consumption.This study can contribute to choosing appropriate heating method in the southern cities of China,and further planning the gas pipe network in these cities.