Abstract
Bread wheat (Triticum aestivum L.) is the most important food crop in the world. Stress factors, primarily drought and hypothermia, have a negative impact on wheat productivity. Transcription factors (TFs) are a promising target for increasing plant resistance to stress due to their ability to control the expression of a large number of defense genes. The most significant regulators of stress resistance reactions are the following TF families: NAC, DREB, and bZIP. We analyzed changes in the relative content of gene transcripts TaNAC69, TaDREB1, and TabZIP60 in seven varieties and two promising breeding lines of bread wheat under drought and hypothermia. Changes in the expression levels of these genes correlated with such parameters of stress resistance as the relative content of water, proline, and malondialdehyde. For the gene TaNAC69, an increase in the relative content of transcripts during drought in all studied cultivars was characteristic; hypothermia caused much smaller changes in the expression profile of this gene. Under the action of hypothermia and drought, the highest level of gene transcripts of TaDREB1 was identified in the L43466 line; in the gene TabZIP60 during drought, the maximum values of transcriptional activity were also shown by line L43466. Line L43466 showed the highest relative level of transcripts under the action of stress factors among all studied genes, which may indicate its greatest potential for further selection.
NSTL
Pleiades Publishing Inc