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2010中国作物学会学术年会

作者： Xia Hu~1,Qian Jia~1,Qin Xu~1,Yuming Shi~2,Yong Sun~1,Linghua Zhu~1,Zhikang Li~(1,3) (1Institute of Crop Science,Chinese Academy of Agricultural Sciences,Beijing 100081,China 2Institute of Rice, Guangxi Academy of Agricultural Sciences,Nanning,530007,China 3International Rice Research Institute,DAPO Box7777,Manila,Philippines.

Iron,zinc and selenium are important micro-nutrients to human *** of micro-nutrients is a serious problem associated with resource poor population in many developing *** high cost and technical difficulty in testing of micro-nutrients,QTL identification and marker-assisted pyramiding of multiple favorable QTLs are considered as a practical strategy to develop micro-nutrients dense *** this study,two BC

关键词： micro-nutrient iron zinc selenium QTL mapping genetic background effect

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Relationship between Leaf micro- and Macro-nutrients in Top Canopy Trees in a Mixed Forest in the Upper Rio Negro in the Amazon Region

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American Journal of Plant Sciences 2014年第10期5卷 1423-1431页

作者： M. A. Sobrado Laboratorio de Biología Ambiental de Plantas Departamento de Biología de Organismos Universidad Simón Bolívar Apartado 89.000 Caracas Venezuela

The mixed forests of the upper Rio Negro at the northern of the Amazon basin grow in oxisol soils that are extremely infertile. These areas exhibit deficiencies in several macro-nutrients, and may also be characterized by the shortage or toxic excess of some micronutrients. The overall goal of this research is to collect more comprehensive information regarding the micronutrient composition of the upper Rio Negro forests as well as discern the relationship between leaf micro- and macro-nutrients that may contribute to the homeostasis and balance of the ionome. Firstly, the nutrient composition within the oxisol soil and leaf tissues of two top canopy tree species from the mixed forests was determined. We then analyzed the relationship between leaf micronutrient composition with N and P levels of the two species and that of species inhabiting the Amazon caatinga. Extractable soil Zn, B, Mn and Cu were very low in the mixed forest. In contrast, Fe and Al levels were potentially toxic. The analysis of leaf N/P ratios revealed for the first time the co-limitation of N and P in the mixed forest. This contrasts with species from the adjacent Amazon caatinga toposequence that are characterized by strong N limitation. All micronutrients within leaves of species inhabiting the mixed forest were also found to have low concentrations. Moreover, Fe and Al were detected at concentrations well below those reported for accumulator species. This suggested that leaf ion homeostasis was maintained under potentially toxic soil Fe and Al conditions. Leaf micronutrient (Fe, Zn and B) contents mirrored that of leaf N and P contents, and comparable Fe/N, Fe/P, Zn/N, Zn/P, B/N as well as B/P ratios were found across species and forest types. Therefore, forest species exhibited the capability to maintain leaf nutrient balances under soil conditions with deficient or toxic levels of micronutrients.

关键词： Amazon Forests Amazon Caatinga Leaf Ionome Homeostasis Leaf N-P and micronutrients micro-nutrient Deficiency micronutrients Toxicity Mixed Forest N-P Co-Limitation Plant nutrient Balance Oxisol Podzol

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