Screening upland rice genotypes for manganese use efficiency
Manganese deficiency in upland rice grown after common bean or soybean, which received adequate rate of liming on highly weathered Oxisols, is observed. A greenhouse experiment was conducted to evaluate manganese use efficiency of 10 upland rice genotypes. The genotypes were grown on an Oxisol at 0mg (Mn)·kg<- 1>(natural soil manganese level) and 20mg (Mn)·kg<-1> of soil applied as manganese sulfate. Grain yield, panicle number, and grain harvest index (GHI) were significantly (P<0.01) influenced by genotype treatment. However, shoot dry weight was significantly affected by Mn as well as genotype treatments. On the basis of Mn- use efficiency (mg grain weight/mg Mn accumulated in shoot and grain), genotypes were classified as efficient and responsive (ER), efficient and nonresponsive (ENR), nonefficient and responsive (NER), and nonefficient and nonresponsive (NENR). Genotype Carisma, CNA8540 and IR42 were classified as ER, and genotypes CNA8557 and Maravilha were classified as ENR. Genotype Caipo was in the group NER and in NENR group were genotypes Bonanca, Canastra, Caraja, and Guarani. From a practical point of view, genotypes which produce high grain yield at a low level of Mn and respond well to added Mn are the most desirable because they are able to express their high yield potential in a wide range of Mn availability.
grain harvest index grain yield Oryza sativa Oxisol
N. K. Fageria
Embrapa Rice and Bean Research Center, Caixa Postal 179, Santo Antonio de Goiaa, GO, CEP 75375-000, Brazil
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
694-695
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）