Determination of Triticum aestivum L. primary resistance to high temperature

Abstract

The changes in the seeds germination capacity of the hexaploid wheat variety Odesskaya 267 after different periods of immersion in water at a temperature of 4 C were studied. The seeds immersion in water for up to 104 hours was accompanied by rapid absorption of water in the first 32 hours (phase I), followed by a slow increase in seed moisture over the next 72 hours (phase II). The seeds sensitivity to the application of heat shock (4852 C) increased with the immersion time, which, together with the improvement of their germination parameters during phase I and the first part of phase II, suggests the seeds coming out of dormancy and initiating processes of germination. The sensitivity to heat shock of the seminal roots initials, especially of the radicle, gradually increased with the imbibition time expansion. Their meristems initials cells have progressed more in exit from dormancy and germination processes intensification during this period. The elaborated method of assessing the seed resistance to heat shock is prospective to compare the primary resistance (without the involvement of adaptation processes) of different wheat genotypes to high temperatures.

Accelerated Methods of Determining Wheat Genotypes Primary Resistance to Extreme Temperatures

“…During ontogenesis, due to adaptation processes, the resistance of genotypes to stress factors varies considerably. The induced level of adaptation depends on both the genotype and the dose of stress factor [12][13][14]. Therefore, the correct distribution of genotypes by resistance requires their synchronization in an identical physiological state.…”

“…Accelerated Methods of Determining Wheat Genotypes Primary Resistance to Extreme… DOI: http://dx.doi.org/10.5772/intechopen.101341 secondary resistance, and the mechanisms that assure stress avoidance [4,12,14]. Thus, the plants' total resistance to abiotic stress depends on three groups of mechanisms: primary resistance, resistance by avoidance, and resistance due to adaptations performed in ontogenesis.…”

Epigenetic in heritance and selection of heat and frost resistant wheat (Triticum aestivum L.) Genotypes

“…Considering that currently, the transmission between cells and plant organs of the traits acquired in ontogenesis is generally recognized, we focused on the inheritance of the primary resistance to thermal stress by seeds of wheat genotypes multiplied under different environmental conditions. We mention that the primary stress resistance is a fundamental characteristic determined by the resistance of organisms to stressors before the induction of adaptation processes, which take place under their influence during ontogenesis [1,2,6].…”