Abstract
Root system architecture (RSA) is used to describe the spatial configuration of a root system in the soil, which substantially determines the capacity of a plant to take up nutrients and water. The present study was to assess if arbuscular mycorrhizal fungi (AMF), Glomus mosseae, G. versiforme, and Paraglomus occultum would alter RSA of peach (Prunus persica L. Batsch) seedlings, and the alteration due to mycorrhization was related to allocation of glucose/sucrose to root (Aglucose/sucrose). Inoculation with G. mosseae and G. versiforme significantly increased leaf, stem, root and total fresh weights, compared with non-AMF treatment. Mycorrhizal alterations of RSA in peach plants were dependent on AMF species, because only G. mosseae and G. versiforme but not P. occultum markedly increased root length, root projected area, root surface area and root volume. For the distribution of root length classes, AMF mainly increased 0-1 and 3-4 cm root length classes, which is AMF species dependent. Inoculated seedlings with Glomus species recorded significantly higher root sucrose and leaf and root glucose concentrations and lower root sucrose concentrations than un-inoculated control. Compared with the non-AMF treatment, G. mosseae and G. versiforme generally increased the Aglucose and Asucrose, but P. occultum significantly decreased the Aglucose and Asucrose. Asucrose or Aglucose was significantly positive correlated with root length, root projected area and root surface area. The results suggest that AMF modified variables of RSA in peach, which is AMF species dependent and related to Aglucose and Asucrose.
Highlights
Plant roots play an important role in plant growth, development and fitness (Zhu et al, 2011)
There is evidence to suggest that Root system architecture (RSA) modifications due to Arbuscular mycorrhizal fungi (AMF) are independent of common symbiosis signaling (Gutjahr et al, 2009) and a consequence of changed nutrition (Fitter and Stickland, 1991)
Root colonization of the peach seedlings was significantly highest with G. mosseae, greater with G. versiforme and least with P. occultum (Fig. 1), suggesting that mycorrhizal colonization in the root of peach seedlings might be AMF species dependent
Summary
Plant roots play an important role in plant growth, development and fitness (Zhu et al, 2011). Roots can provide anchorage and support for the shoot, uptake water and nutrients, store carbohydrates, take part in the biosynthesis of important hormones, and are involved in interactions with the rhizosphere. Mycorrhizal symbiosis could help peach seedlings to overcome soil-fumigation nutrient-deficiency effects in nursery and alleviate flooded stress, but not overcome peach replant problem (Rutto et al, 2002; Rutto and Mizutani, 2006), there is no information about the role of AMF on RSA of peach Wu Q.-S. et al / Not Bot Horti Agrobo, 2011, 39(2):232236 been determined the AMF effect on RSA of peach, which is related to carbohydrate allocation
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