Record ID No. |
6249 |
Author(s) |
Kobae Y.*, Ohmori Y., Saito C., Yano K., Ohtomo R and Fujiwara. , 2016 |
Affiliation |
*Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan. |
Title |
Phosphate treatment strongly inhibits new arbuscule development but not the maintenance of arbuscule in mycorrhizal rice roots. |
Source. Vol.(no):Page |
Plant physiology. 171: 566-579. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Methodology Physiology |
Sub-subjects |
Angiospermic parasites Biocontrol agents Biodiversity Burning Carbohydrate metabolism Climate change Cropping effect Cultural Studies Cuttings Dependency Difficult sites Disturbed land Fossil taxonomy Fungal evaluation Fungicides Genetic Diversity Heavy Metals Hormones Hydrolytic enzymes |
Host |
Oryza sativa |
Organism |
NA |
Country |
Japan |
Abstracts |
Phosphorus (P) is a crucial nutrient for plant growth, but its availability to roots is limited in soil. Arbuscular mycorrhizal (AM) symbiosis is a promising strategy for improving plant P acquisition. However, P fertilizer reduces fungal colonization (P inhibition) and compromises mycorrhizal P uptake, warranting studies on the mechanistic basis of P inhibition. In this study, early morphological changes in P inhibition were identified in rice (Oryza sativa) using fungal cell wall staining and live-cell imaging of plant membranes that were associated with arbuscule life cycles. Arbuscule density decreased, and
aberrant hyphal branching was observed in roots at 5 h after P treatment. Although new arbuscule development was severely inhibited, preformed arbuscules remained intact and longevity remained constant. P inhibition was accelerated in the rice pt11-1 mutant, which lacks P uptake from arbuscule branches, suggesting that mature arbuscules are stabilized by the symbiotic P transporter under high P condition. Moreover, P treatment led to increases in the number of vesicles, in which lipid droplets accumulated and then decreased within a few days. The development of new arbuscules resumed within by 2 d.
Our data established that P strongly and temporarily inhibits new arbuscule development, but not intraradical accommodation of AM fungi. |