Genotype dependent variation in mycorrhizal colonization and response to inoculation of pearl millet |
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| Authors: | K R Krishna K G Shetty P J Dart D J Andrews |
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| Institution: | (1) International Crop Research Institute for the Semi-Arid Tropics, 502 324 Patancheru, Andhra Pradesh, India;(2) Present address: Research School of Biological Sciences, Australian National University, P. O. Box 475, 2601 Canberra City, ACT, Australia;(3) Present address: Department of Agronomy, University of Nebraska, 68588 Lincoln, Nebraska, USA |
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| Abstract: | Summary Genotypes of pearl millet (Pennisetum americanum L. Leeke) were examined for differences in vesicular-arbuscular mycorrhizal (VAM) colonization and response to inoculation. For thirty genotypes tested across three field locations there was a range of mycorrhizal colonization intensity between 25 and 56%. In another experiment with two male-sterile lines, restorer lines and their derived crosses, grown in pots filled with non-sterilized soil there were significant differences between genotypes for colonization by mycorrhiza. This showed hostgenotype dependence for mycorrhizal colonization.Root growth rates, mycorrhizal root length, percentage root colonization and plant growth and P uptake were studied in ten genotypes. A set of 3 genotypes with similar root lengths varied significantly with regard to mycorrhizal root length and the percentage colonization. This supports the suggestion that VAM colonization and spread is dependent on the host genotype. The growth responses differed significantly between the genotypes and they also differed in their responses to P uptake and VAM inoculation. The utility of host-genotype dependent differences in VAM symbiosis in plant breeding is discussed.Journal Article No. 453 |
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| Keywords: | Genetic crosses Genotypes Mycorrhizal colonization Pearl millet Plant effects Response |
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