Response of Two Maize Inbred Lines with Contrasting Phosphorus Efficiency and Root Morphology to Mycorrhizal Colonization at Different Soil Phosphorus Supply Levels |
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| Authors: | Lifang Hao Junling Zhang Peter Christie Xiaolin Li |
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| Affiliation: | 1. Key Laboratory of Plant Nutrition, Ministry of Agriculture;2. Key Laboratory of Plant-Soil Interactions, Ministry of Education;3. and Department of Plant Nutrition, College of Resources and Environmental Sciences , China Agricultural University , Beijing, China;4. and Department of Plant Nutrition, College of Resources and Environmental Sciences , China Agricultural University , Beijing, China;5. Agricultural and Environmental Science Department , Queen's University Belfast , UK |
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| Abstract: | ABSTRACT A pot experiment investigated the response of two maize inbred lines with contrasting root morphology and phosphorus (P) efficiency to inoculation with Glomus mosseae or Glomus etunicatum compared with non-mycorrhizal controls. Soil phosphorus was supplied at rates of 10, 50, and 100 mg P kg ?1 soil. Root length, specific root length, and specific phosphorus uptake of maize line 178 (P-efficient) were significantly higher than of line Hc (P-inefficient). Percentage of root length colonized showed the opposite trend regardless of soil P supply level. The two maize lines did not differ significantly in growth response to mycorrhizal colonization. Root colonization rate decreased with increasing soil phosphorus supply. The beneficial effect of the two AM fungi on plant growth and P uptake was greatest at low soil P level and the responses were negative at high P supply. Mycorrhizal responsiveness also decreased with increasing P supply and differed between the two mycorrhizal fungal isolates. |
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| Keywords: | Arbuscular mycorrhizal fungi Soil phosphate supply Maize Phosphorus efficiency Mycorrhizal responsiveness |
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