Table of Contents
Journal of Botany
Volume 2012, Article ID 129591, 8 pages
http://dx.doi.org/10.1155/2012/129591
Research Article

Glomus intraradices Attenuates the Negative Effect of Low Pi Supply on Photosynthesis and Growth of Papaya Maradol Plants

1Laboratorio de Fisiología Vegetal Molecular, Centro de Investigación Científica de Yucatán, Calle 43 No. 130, Colonia Chuburná de Hidalgo, Mérida, YUC, México 97200, Mexico
2Laboratorio de Micorrizas, Centro de Investigación en Ciencias Biológicas (CICB), Universidad Autónoma de Tlaxcala, Ixtacuixtla, TLAX, México 90000, Mexico
3Área de Microbiología, Especialidad de Edafología, Instituto de Recursos Naturales, Colegio de Postgraduados Campus, Montecillo, MEX, México 56230, Mexico

Received 1 August 2011; Accepted 13 September 2011

Academic Editor: Kang Chong

Copyright © 2012 Nava-Gutiérrez Yolanda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Low inorganic phosphorus (Pi) supply limits the photosynthetic process and hence plants growth and development. Contradictory reports exist in the literature on whether mycorrhyzal association can attenuate the negative effects of low Pi supply on photosynthesis and growth. In the present paper, the effect that low Pi supply may have on photosynthesis and growth of papaya Maradol plants was evaluated in intact plants and in those inoculated with two different strains of the arbuscular mycorrhizal fungi Glomus intraradices. Plant growth was significantly reduced as the Pi supply decreased. However, inoculation with any strain of G. intraradices was able to attenuate such effect. Without Pi in the nutrient solution, the mycorrhizal plants had on average 6.1 times and 7.5 higher photosynthesis than non mycorrhizal plants. The chlorophyll fluorescence values were significantly higher in mycorrhizal than in non-mycorrhizal plants. These results could be associated to an increased ability of mycorhyzal plants to take up Pi from the substrate, as they had higher Pi content than non-mycorrhizal plants. A high correlation was found between internal Pi content and plant biomass. The lower correlation between Pi content and photosynthesis, suggests that some photosynthates could had been used to maintain the symbiosis.