Lupinus species differ in their requirements for iron |
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Authors: | Caixian Tang Alan D Robson |
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Institution: | (1) Soil Science and Plant Nutrition, The University of Western Australia, 6009 Nedlands, WA, Australia;(2) Centre for Legumes in Mediterranean Agriculture, The University of Western Australia, 6009 Nedlands, WA, Australia |
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Abstract: | The effect of iron supply on the growth and nodulation ofLupinus angustifolius L. (Gungurru),Lupinus luteus L. (R-1171) andLupinus pilosus Murr. (P20957) was studied in acid solutions. Plants of the three species were grown together in the same solution and inoculated
withBradyrhizobium (Lupinus) WU 425. Plants were then grown with or without applied NH4NO3. The lupin species differed greatly in their sensitivity to low iron concentrations in solution withL. pilosus being most tolerant andL. luteus most sensitive.L. pilosus had the highest iron concentration in tissues and had a higher ratio of iron concentration in the youngest fully expanded
leaf blades (YEB) to that in roots than the other two species.L. luteus had higher iron concentrations in roots but lower iron concentration in YEB and shoots than didL. angustifolius. The requirements of internal iron for the maximal chlorophyll synthesis in YEB were 65 μg g-1 forL. angustifolius andL. luteus, and 52 μg g-1 forL. pilosus. In contrast to effects on growth, the three species had similar external iron requirements for nodule formation in roots
and for maximal nitrogen concentrations in shoots. The results indicate that iron tolerant lupin species require lower internal
and external iron supply and have a greater ability than sensitive species to translocate iron from roots to shoots. |
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Keywords: | Lupinus angustifolius L Lupinus luteus L Lupinus pilosus Murr iron deficiency nodulation |
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