Iron: an essential micronutrient for the legume-rhizobium symbiosis

被引:143
作者
Brear, Ella M. [1 ]
Day, David A. [2 ]
Smith, Penelope M. C. [1 ]
机构
[1] Univ Sydney, Sch Biol Sci, Sydney, NSW 2006, Australia
[2] Flinders Univ S Australia, Sch Biol Sci, Adelaide, SA 5001, Australia
来源
FRONTIERS IN PLANT SCIENCE | 2013年 / 4卷
关键词
legume-rhizobium symbiosis; nitrogen fixation; nodule; iron; symbiosome; bacteroid; symbiosome membrane; COMMON BEAN NODULES; NITROGEN-FIXATION; GENE-EXPRESSION; ROOT-NODULES; FERROUS IRON; BRADYRHIZOBIUM-JAPONICUM; PERIBACTEROID MEMBRANE; STRESS RESPONSE; VACUOLAR IRON; XYLEM SAP;
D O I
10.3389/fpls.2013.00359
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Legumes, which develop a symbiosis with nitrogen-fixing bacteria, have an increased demand for iron. Iron is required for the synthesis of iron-containing proteins in the host, including the highly abundant leghemoglobin, and in bacteroids for nitrogenase and cytochromes of the electron transport chain. Deficiencies in iron can affect initiation and development of the nodule. Within root cells, iron is chelated with organic acids such as citrate and nicotianamine and distributed to other parts of the plant. Transport to the nitrogen-fixing bacteroids in infected cells of nodules is more complicated. Formation of the symbiosis results in bacteroids internalized within root cortical cells of the legume where they are surrounded by a plant-derived membrane termed the symbiosome membrane (SM). This membrane forms an interface that regulates nutrient supply to the bacteroid. Consequently, iron must cross this membrane before being supplied to the bacteroid. Iron is transported across the SM as both ferric and ferrous iron. However, uptake of Fe(II) by both the symbiosome and bacteroid is faster than Fe(III) uptake. Members of more than one protein family may be responsible for Fe(II) transport across the SM. The only Fe(II) transporter in nodules characterized to date is GmDMT1 (Glycine max divalent metal transporter 1), which is located on the SM in soybean. Like the root plasma membrane, the SM has ferric iron reductase activity. The protein responsible has not been identified but is predicted to reduce ferric iron accumulated in the symbiosome space prior to uptake by the bacteroid. With the recent publication of a number of legume genomes including Medicago truncatula and G. max, a large number of additional candidate transport proteins have been identified. Members of the NRAMP (natural resistance-associated macrophage protein), YSL (yellow stripe-like), VIT (vacuolar iron transporter), and ZIP (Zrt-, Irt-like protein) transport families show enhanced expression in nodules and are expected to play a role in the transport of iron and other metals across symbiotic membranes.
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页数:15
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