6533b834fe1ef96bd129d3c6

RESEARCH PRODUCT

Caractérisation expérimentale de la variabilité phénotypique du système racinaire nodulé de génotypes contrastés de pois (Pisum sativum L.), en phase végétative et en milieu de croissance non azoté

subject

description

One of the challenges in plant breeding pea is to offer adapted genotypes to non-optimal environmental conditions. One of the factors limiting the agronomic performance of the pea is related to the environment plant sensitivity. Nodulated root system traits determine this sensitivity. The characterization of phenotypic traits combinations of the nodulated root system in different peas genotypes is interesting to suggest new plant breeding traits. The objective of this work was to experimentally characterize the phenotypic variability of the nodulated root system of 10 pea genotypes. The analysis was conducted under controlled conditions. The plants were grown in the absence of nitrates. Phenological stages were defined during the vegetative phase. We proposed 5 characterization levels of the nodulated roots phenotypic variability. At the level of the whole plant, level 1 shows between the genotypes the differences of the total dynamic growth and carbon acquisition. Level 2 shows between the genotypes the differences of growth morphological determinants of the aerial parts, roots and nodules. Level 3 shows between genotypes the differences of distribution and use of carbon between roots and nodules in association with the aerial parts. Level 4 shows between genotypes the differences of growth process in strong interaction with the carbon fluxes at the plant and nodulated root system scales. Level 5 shows between genotypes differences of root system architectures. The results are contrasted phenotypic root traits combinations in association with the aerial parts of the plant. Peas, Experimental characterization; Phenotypic variability; Nodulated root system; Carbon flux at the plant scale.