Abstract
In order to study the role of FAM on water stress tolerance of sorghum plants. Factorial experiment under greenhouse conditions was conducted with four levels of water potential (-0.04, -0.2, -0.4 and -0.8 Map) and two levels of phosphorus (0 and 25 mgkg-1). The results demonstrate that there were no roots colonized with AMF in non-inoculated plants. In inoculated plants roots colonized with AMF percentage increased with increased of water stress and decreased with phosphorus addition and the higher value was 86% in plants grow under water potential -0.8 MPa and received 0 phosphorus while the lowest value was 46% in plants grow under water potential -0.04 MPa and received 25 phosphorus. Inoculation with AMF increased plant fresh weight, roots, shoots dry matter, and plant phosphorus uptake. The results show AMF have protected sorghum plants against drought stress and it is clear that the effects of AMF on plant growth parameters was higher than the effects of phosphorus addition specially in drought stress conditions hence we can suggested that there are addition ways than phosphorus nutrition improvement that AMF can increase host plant drought tolerance.
Highlights
Water availability is considered to be one of the major limiting factors for plant growth and yield in many areas [1]
The highest value of colonization was 86% in plants grown under water potential -0.8 MPa and received 0 mg phosphorus while the lowest value was in plants grown under water potential -0.04 MPa and received 25 mg phosphorus
3-2 Plant growth parameters Fig. (2) shows in general that the increase drought stress causing decrease fresh plant weight, shoots and roots dry matter, in both mycorrhizal and non mycorrhizal plants comparing with control -0.04 MPa
Summary
Water availability is considered to be one of the major limiting factors for plant growth and yield in many areas [1]. وخاصة في النباتات الناميو تحت الشد الرطوبي 0نتائج ىذه الد ارسو اوضحت ان فطريات المايكو اري از حمت نباتات الذره Some of these mechanisms include: plant gas exchange and leaf hydration, changes in plant hydraulic, enhancement in soil properties, increase in roots surfaces areas of host plants, improvement in efficiency of water absorption as well as protection against oxidative stress facilitated by drought; [10], [11].
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