Manganese nutrition of Lupinus spp. especially in relation to developing seeds
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Patterns of transport and accumulation of manganese were studied in Lupinus albus L. and Lupinus angustifolius L. in a wide range of availability levels in the rooting medium. The recently described ‘split seed’ disorder, involving discolouration, splitting, and deformity of seeds, was reproduced in sand culture using critically low levels of manganese. The disorder was prevented by maintaining adequate manganese in the medium and its incidence in field and glasshouse was quantitatively related to the managnese level in seed and fruit phloem sap. The use of phloem sap analysis for early diagnosis of the disorder is suggested. High levels of manganese in parent seed is suggested to afford protection against the disorder by improving early vegetative growth in a manganese deficient situation. Direct carry-over of manganese from one seed generation to the next was insignificant.
Manganese proved to be fully mobile in xylem but only sparingly mobile in phloem from vegetative structures to seed. It was accumulated in massive amounts in leaves and fruits when availability was high. Seed manganese content increased 80–100 fold as the level in the rooting medium was increased from 0⋅1 to 500 mg Mn 1−1. L. albus was superior to L. angustifolius in accumulating manganese in leaves and pods, and more efficient in translocating the element to its seeds. These differences were greatest at low or moderate manganese levels. Xylem intake by a fruit was small relative to phloem intake when manganese availability was low, but became increasingly important as the supply in the rooting medium was raised.
|Publication Type:||Journal Article|
|Publisher:||Oxford University Press|
|Copyright:||© 1977 Annals of Botany Company|
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