Genetic variation for VA mycorrhiza-dependent phosphate mobilisation in groundnut (Arachis hypogaea L.) |
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Authors: | P S Kesava Rao K V B R Tilak V Arunachalam |
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Institution: | (1) Division of Genetics, Indian Agricultural Research Institute, 110 012 New Delhi, India;(2) Division of Microbiology, Indian Agricultural Research Institute, 110 012 New Delhi, India |
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Abstract: | Nine cultivars of groundnut (Arachis hypogaea L.) were grown in a soil poor in available N or P. There was clearly genetic variation of characteristics indicative of VA
mycorrhiza-dependent phosphate mobilisation, namely, VA mycorrhiza fungal spore count (SC), percentage of infection (IF) by
VA mycorrhizal fungi (VAMF) and acid and alkaline phosphatase activities. Among the cultivars, one was non-nodulating with
low values for all characteristics and in another experiment, this non-nodulating cultivar, one of its parents (PI 259747),
a national check (Robut 33-1) and the highest yielding cultivar among the original nine (NFG 7), were grown and investigated
for various P-mobilising properties and yield. The linear regression coefficient of pod yield on % VAMF infection was significant
in both the experiments. Additionally, many of the correlation coefficients of pod yield and VAM dependent characteristics
were positive and significant. From consideration of published evidence, it seems possible to breed for the desirable reinforcing
effects of infestation, by VAMF and Rhizobium that can ultimately improve the productivity of groundnuts. |
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Keywords: | Arachis hypogaea genetic variation groundnut phosphate mobilisation VA mycorrhiza |
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