Responses of Weedy Rice to Drought Stress at Germination and Seedling Stages
Drought is a world-spread problem seriously influencing grain production and quality, the loss of which is the total for other natural disasters, with increasing global climate change making the situation more serious.Rice is the staple food for more than 23% of world population, so rice anti-drought physiology study is of importance to rice production and biological breeding for the sake of coping with abiotic and biotic conditions.Much research is involved in this hot topic, but the pace of progress is not so large because of drought resistance being a multiple-gene-control quantitative character.On the other hand, stress adaptive mechanisms are quite different, with stress degree, time course, materials, soil quality status and experimental plots, thus increasing the complexity of the issue in question.Additionally, a little study is related to weedy rice.In order to investigate the effects of drought stress on germination and early seedling growth of weedy rice (Oryza sativa f.spontanea L.) and cultivated rice (Oryza sativa L.), polyethyleneglycol-6000 (PEG-6000) are used to generate-1.33MPa and 0MPa water stress in a laboratory condition (28±3℃).Complete randomized design with three replications is used in the study.After 10 days of germination, shoot length, the longest root length, root fresh weight, root dry weight, shoot fresh weight, shoot dry weight and root numbers are measured; germination percentage, and root to shoot ratio are calculated.Germination index (GI), shoot length stress index (SLSI), root length stress index (RLSI) and dry matter stress index (DMSI) are used to evaluate the response of different genotypes to PEG-induced water stress.Results of ANOVA analysis show that responses of weedy rice accessions and cultivated rice varieties to water stress are significant different, demonstrating the germplasm of weedy rice and cultivated rice are diverse which enables us to screen the germplasm tolerant to drought stress.
drought polyethylene glycol (PEG) weedy rice global climate change
Guo-hua Ding Xiao-liang Liu Dian-rong Ma Xiao-xue Wang Guang Yang Ming-chao Gao Qi Gao Jian Sun Wen-fu Chen
Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture, and Key Laboratory of Northern Japonica Rice Genetics and Breeding, Ministry of Education, Rice Research Institute, Shenyang Agricultural University, Dongling Road 120,Shenyang,110866,China
国际会议
杭州
英文
451-459
2013-01-18（万方平台首次上网日期，不代表论文的发表时间）