Cyclin B1;1 activity is observed in lateral roots but not in the primary root during lethal salinity and salt stress recovery

Abstract

Earlier, we reported that Arabidopsis young lateral roots (LR) exhibited improved lethal salinity tolerance as compared with the primary root (PR). We have shown that cell death processes which take place in the PR during salt stress are postponed in the LR. Still, very little is known about the regulation of cell survival mechanisms in the LR during salinity stress. Here we used transgenic Arabidopsis plants expressing Cyclin B1;1:GUS, to further study the responses to salinity in the PR and LR positions. We found strong Cyclin B1;1: GUS activity in young budding LR of salt stressed and stress recovered plants. The Cyclin B1;1:GUS activity dropped significantly in long LR and was almost completely abolished in the PR. Our data provides another line of evidence that position-dependent response occurs in Arabidopsis roots during lethal salinity. The possible roles Cyclin B1;1 plays in the young LR during the response to lethal salinity are discussed.

Arbuscular Mycorrhizal Symbiosis Leads to Differential Regulation of Genes and miRNAs Associated with the Cell Wall in Tomato Leaves

“…The expression of cyclin B1 in Arabidopsis accelerates the proliferation of root cells and promotes DNA repair [ 69 , 70 ]. Recent studies by Ambastha and Leshem (2020) provide evidence for the intense activity of cyclin B1 during salt stress as a means to repair damaged DNA in Arabidopsis [ 71 ]. Since mycorrhiza colonization also induces resistance to abiotic stress, cyclin B1 might be involved in the response to abiotic instead of biotic stress.…”