Performance physiologique du génotype autotétraploïde induit de Trigonella foenum-graecum L. comparée aux génotypes diploïdes

Abstract Polyploid plants are distinguished from diploids by an improved photosynthetic capacity related to the increase of the photosynthetic enzymes and pigments quantities. The aim of this work was to study the physiological performances accompanying the experimental polyploidisation of Trigonella foenum- graecum by comparing the induced autotetraploid, the diploid resulting from the treated plants and the parent. Total chlorophylls content, photosynthesis rate, transpiration rate and stomatal conductance were measured for each genotype. Results showed highly significant variations (p < 0.01) between the different genotypes for the studied physiological characters. PCA and UPGMA method structured the genotypes in two groups. The first group is formed by the autotetraploids and the second is consisted by the parents and the diploids resulting from the treated plants.