naa a22 4500 510788637 CHVBK 20180411083311.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s12298-013-0197-z doi (NATIONALLICENCE)springer-10.1007/s12298-013-0197-z Changes in homologous recombination frequency in Arabidopsis thaliana plants exposed to stress depend on time of exposure during development and on duration of stress exposure [Elektronische Daten] [Seyed Rahavi, Igor Kovalchuk] In the past, we showed that exposure to abiotic and biotic stresses changes the homologous recombination frequency (HRF) in somatic tissue and in the progeny. In current work we planned to answer the following question: do stress intensity/duration and time during exposure influence changes in somatic HRF and transgenerational changes in HRF? Here, we tested the effects of exposure to UV-C, cold and heat on HRF at 7, 14, 21 and 28days post germination (dpg). We found that exposure at 14 and 21dpg resulted in a higher increase in HRF as compared to exposure at 7dpg; longer exposure to UV-C resulted in a higher frequency of HR, whereas prolonged exposure to cold or heat, especially at later developmental stages, had almost no effect on somatic HRF. Exposure at 7dpg had a positive effect on somatic growth of plants; plants exposed to stress at this age had larger leaves. The analysis of HRF in the progeny showed that the progeny of plants exposed to stress at 7dpg had an increase in somatic HRF and showed larger sizes of recombination spots on leaves. The progeny of plants exposed to UV-C at 7dpg and the progeny of plants exposed to cold or heat at 28dpg had larger leaves as compared to control plants. To summarize, our experiments showed that changes in somatic and transgenerational HRF depend on the type of stress plants are exposed to, time of exposure during development and the duration of exposure. Prof. H.S. Srivastava Foundation for Science and Society, 2013 Abiotic stress nationallicence Arabidopsis thaliana nationallicence Development time nationallicence Homologous recombination frequency nationallicence Transgenerational response nationallicence CCD : Charge-coupled device nationallicence DPG : Days post germination nationallicence HDT : Heat of different temperature nationallicence HDD : Heat of different duration nationallicence HR : Homologous recombination nationallicence HRF : Homologous recombination frequency nationallicence SE : Standard error nationallicence Rahavi Seyed Department of Biological Sciences, University of Lethbridge, T1K 3M4, Lethbridge, AB, Canada aut Kovalchuk Igor Department of Biological Sciences, University of Lethbridge, T1K 3M4, Lethbridge, AB, Canada aut Physiology and Molecular Biology of Plants Springer India 19/4(2013-10-01), 479-488 0971-5894 19:4<479 2013 19 12298 https://doi.org/10.1007/s12298-013-0197-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12298-013-0197-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rahavi Seyed Department of Biological Sciences, University of Lethbridge, T1K 3M4, Lethbridge, AB, Canada aut NATIONALLICENCE 700 1- Kovalchuk Igor Department of Biological Sciences, University of Lethbridge, T1K 3M4, Lethbridge, AB, Canada aut NATIONALLICENCE 773 0- Physiology and Molecular Biology of Plants Springer India 19/4(2013-10-01), 479-488 0971-5894 19:4<479 2013 19 12298 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer