| Autor: |
Osipova, Svetlana, Permyakov, Alexey, Konstantinov, Dmitrii, Shchukina, Ludmila, Rudikovskaya, Elena, Permyakova, Marina, Pshenichnikova, Tatyana |
| Zdroj: |
Cereal Research Communications; March 2024, Vol. 52 Issue: 1 p101-113, 13p |
| Abstrakt: |
Four lines of drought–tolerant wheat cultivar Saratovskaya 29 that carry different regions of introgression from the 2Atchromosome of Triticum timopheeviiinto a homologous chromosome were studied for gas exchange parameters, chlorophyll fluorescence, and a shoots biomass under two contrasting watering regimes in a climatic chamber. Yield components were studied in the same lines in a greenhouse and in three field seasons. Introgression into the distal region of the short arm of 2A chromosome, limited by Xgwm1539and Xgwm4849microsatellite markers did not reduce the adaptive potential of the lines, one of which was characterized by the highest productivity, regardless of the environment. Introgression into the pericentromeric region of the long arm of 2A chromosome had a negative effect on the transfer of excitation energy in the light-harvesting complex of photosystem II regardless of the growing conditions and had a negative effect on productivity in the field. A homology was shown between the regions limited by Xgwm636and Xgwm455markers on the short arms of chromosomes 2A and 2D, as well as between regions designated by SNP markers Excalibur_c47535_389, and microsatellite marker Xgwm539on chromosomes 2A and 2D. These regions are united by similar physiological answers to drought. For the two different introgression regions, and the most probable candidate genes are proposed associated with drought adaptation. The results confirm the assumption about the critical role of the centromeric region of the second homoeological group chromosomes of wheat for adaptation to drought. |
| Databáze: |
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