Toleranța grâului comun la seceta mediată de PEG 6000 în stadiul incipient al creșterii

Abstract

The local common wheat genotypes L101/BT16-04, L101/Od.267, LM/Od.162/M79 and Moldova 11 were investigated at the early growth stage for the response of some morphological characters to the separate and associated action of abiotic factors of drought and temperature. Under optimal temperature conditions, the analysis of variance showed the major weight of genotype in response formation for the RL trait (78.2%). The Water Restriction factor contributed the highest share in the phenotypic variability of GP, SL and PVI (54.6%, 43.8% and 80.7%). Under unfavorable temperature conditions WR factor showed major contributions in the variance of all traits, particularly for SL - 86.1%. The weight of the targeted factors in the variance of RL and SL under both heat treatment conditions indicates a different adaptation of the given traits to drought conditions. At the same time, the high weight of Water Restriction in the variance formation of the SL phenotype reflects a major growth limitation, SL being one of the indices with the highest susceptibility to drought. Cluster analysis (Ward`s method) based on the variability of the Tolerance Index to the concomitant action of abiotic stress factors classified genotype L101/BT16-04 with increased susceptibility for the phenotypic response GP, RL, SL and PVI