Screening of diverse cassava genotypes based on nitrogen uptake efficiency and yield  

作　　者：KANG Liang LIANG Qiong-yue JIANG Qiang YAO Yi-hua DONG Meng-meng HE Bing GU Ming-hua 

机构地区：[1]State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/College of Agriculture,Guangxi University,Nanning 530004,P.R.China [2]College of Pharmacy,Guangxi Medical University,Nanning 530021,P.R.China [3]Modern Agricultural Technology Research and Promotion Center,Baise 533612,P.R.China

出　　处：《Journal of Integrative Agriculture》2020年第4期965-974,共10页农业科学学报（英文版）

基　　金：provided by the Guangxi Natural Science Foundation,China(2014GXNSFAA118077 and 2018GXNSFDA281056);the Guangxi Postgraduate Innovative Education Research Program,China(YCBZ2017013 and YCSW2018039)。

摘　　要：As one of the top three tuber crops of the world, cassava is a staple food and feed crop for tropical and subtropical regions. Because of its high drought resistance and tolerance to nutrient deficiency, cassava is usually cultivated on hilly areas that are nutrient-poor. Nitrogen(N) is one of the significant factors affecting cassava yield. A double factorial(N level×genotypes) split-plot field experiment was conducted to analyze differences in yield and N accumulation of 25 cassava genotypes under low-N conditions to screen for cassava genotypes with high-N efficiency. The two-year field experiment showed that cassava yield and N accumulation are determined by specific genotypes, soil N levels, and year. Among these factors, soil N levels are the main factors that are responsible for differences in cassava yield. When yield and relative N accumulation under low-N conditions were used as screening markers, we identified an efficient and responsive genotype(SC10), and two inefficient and non-responsive genotypes(SC205 and GR5). The efficient and responsive genotype and the inefficient and non-responsive genotype can be used as study materials to further reveal the mechanisms for high-N efficiency in cassava.As one of the top three tuber crops of the world, cassava is a staple food and feed crop for tropical and subtropical regions. Because of its high drought resistance and tolerance to nutrient deficiency, cassava is usually cultivated on hilly areas that are nutrient-poor. Nitrogen(N) is one of the significant factors affecting cassava yield. A double factorial(N level×genotypes) split-plot field experiment was conducted to analyze differences in yield and N accumulation of 25 cassava genotypes under low-N conditions to screen for cassava genotypes with high-N efficiency. The two-year field experiment showed that cassava yield and N accumulation are determined by specific genotypes, soil N levels, and year. Among these factors, soil N levels are the main factors that are responsible for differences in cassava yield. When yield and relative N accumulation under low-N conditions were used as screening markers, we identified an efficient and responsive genotype(SC10), and two inefficient and non-responsive genotypes(SC205 and GR5). The efficient and responsive genotype and the inefficient and non-responsive genotype can be used as study materials to further reveal the mechanisms for high-N efficiency in cassava.

关 键 词：CASSAVA high-nitrogen(N)efficiency GENOTYPE SCREENING low-N soil 

分 类 号：S533[农业科学—作物学]