El miércoles 16 de Diciembre el IAL recibe la visita de la Dra. Soledad Traubenik del Institute of Plant Sciences Paris-Saclay (IPS2), Paris-Saclay, Francia, quien dictará un seminario en el auditorio del Instituto.
más información: seminariosial@santafe-conicet.gov.ar
ABSTRACT
Phosphorus (P) is an essential macronutrient for the production of food crops and the demand for P fertilizer is increasing worldwide. Earth's P is being depleted at an alarming rate urging the need to find solutions for crops to be more P efficient. White lupin can form specific organs constituted by numerous short lateral roots, the so-called cluster roots (CRs), as an adaptation to low phosphate availability in the soil, allowing an efficient acquisition of this nutrient, which is fundamental for plant growth and development. MicroRNAs are good candidates for controlling root development and its response to phosphate starvation by playing a pivotal role in regulating gene expression during development and in response to environmental cues. We performed a complete transcriptome analysis covering different stages of CR development in wild-type white lupin plants and in the constitutive cluster root (ccr 1) mutant, which produces numerous CRs in the presence of phosphate (repressive conditions). The detailed analysis led us to identify both many conserved but also novel miRNAs with specific interesting profiles along the developmental series. Expression and functional analysis of candidate miRNAs revealed that the well-conserved miR396 would be playing a role in CR development different from its well-known function in root growth regulation. Hence, variation in gene regulation through miRNAs may be linked to the evolution of cluster roots in white lupin. A better understanding of the biological phenomenon that leads to the development of CRs will help to select regulatory networks with potential use in the improvement of relevant agronomic traits.
