Effects of arbuscular mycorrhizal fungi and drought stress on growth and nutrient uptake of two wheat genotypes differing in drought resistance |
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Authors: | G N Al-Karaki A Al-Raddad |
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Institution: | (1) Faculty of Agriculture, Jordan University of Science and Technology, P.O. Box 3030, Irbid, Jordan, JO |
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Abstract: | The effects of an arbuscular mycorrhizal (AM) fungus and drought stress on the growth, phosphorus, and micronutrient uptake
of two wheat genotypes exhibiting differences in drought resistance were investigated. Plants were grown on a low P (4 mg
kg–1 soil) silty clay (Typic Xerochrept) soil-sand mix. Mycorrhizal infection was higher under well-watered than under dry soil
conditions and the drought-resistant genotype CR057 had a higher mycorrhizal colonization than the drought-sensitive genotype
CR006. Total and root dry matter yields and total root length were higher in mycorrhizal than in nonmycorrhizal plants of
both genotypes. CR057 had higher total dry matter but not root dry matter than CR006 plants. The enhancement in total dry
matter due to AM inoculation was 42 and 39% under well-watered and 35 and 45% under water-stressed for CR057 and and CR006,
respectively. For both genotypes, the contents of P, Zn, Cu, Mn, and Fe were higher in mycorrhizal than in nonmycorrhizal
plants and higher under well-watered than under dry soil conditions. The enhancement of P, Zn, Cu, Mn, and Fe uptake due to
AM inoculation was more pronounced in CR006 than in CR057, particularly under water-stressed conditions. Thus CR006 benefitted
from AM infection more than the CR057 under dry soil conditions, despite the fact that CR057 roots were highly infected. It
appears that CR006 is more dependent on AM symbiosis than CR057.
Accepted: 12 February 1997 |
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Keywords: | AM Drought resistance Genotype Phosphorus Triticum durum |
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