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- Title
Boron deficiency in pasture based on subterranean clover (Trifolium subterraneum L.) is linked to symbiotic malfunction.
- Authors
Hamilton, Leo J.; Reed, Kevin F. M.; Leach, Elainne M. A.; Brockwell, John
- Abstract
Field and glasshouse experiments confirmed the occurrence of boron (B) deficiency in subterranean clover (Trifolium subterraneum L.) pasture in eastern Victoria. Diminished productivity was linked to the small-seededness of clover and the poor effectiveness of clover root-nodule bacteria (rhizobia, Rhizobium leguminosarum bv. trifolii). Productivity, especially of clover and clover seed, increased following applications of up to 6 kg B ha[sup-1] (P< 0.001). The response was delayed, occurring several years after the initial application of B, unless the land was resown with fresh clover seed inoculated with an effective strain of rhizobia. B deficiency in the nodulated legume induced conditions within the plant and or its rhizobia that led to impaired nitrogen (N[sub 2]) fixation. Glasshouse research indicated that populations of soil-borne rhizobia taken from B-deficient soils were poorly effective in N[sub 2] fixation and that rhizobia from soils growing subterranean clover cv. Leura were significantly less effective (P < 0.05) than rhizobia from a soil growing cv. Mt Barker. Additionally, subterranean clover seed generated in B-deficient soils was at least one-third smaller than that of commercial seed but responded to inoculation with effective rhizobia. This indicated that any symbiotic malfunction of clover from B-deficient soils was not due to an inability to respond to mtmgenperse. On the other hand, cv. Leura from B-deficient soils fixed significantly less N [sub 2] than commercial cv. Leura when each was inoculated with rhizobia from B-deficient soils.
- Subjects
SUBTERRANEAN clover; BORON deficiency; PLANT-bacterial symbiosis; PLANTS
- Publication
Crop & Pasture Science, 2015, Vol 66, Issue 11, p1197
- ISSN
1836-0947
- Publication type
Article
- DOI
10.1071/CP14300