The latter is implied by each the induction of leaf chlorosis and senescence and the calculated drop in the chlorophyll content material of the leaves of pressured crops. The present info confirmed that both salinity and trehalose activate the ABA-mediated dampness stress response. . The sole BURP gene loved ones to be up- regulated in the aerial element of the plant was AtRD22, constant with observations primarily based on the expression of the transgene pAtRD22::GUS .
The transcriptional responses to publicity to one hundred fifty mM NaCl and to four% w/v trehalose overlapped by about 10% (Determine S6A). The a hundred and fifty mM NaCl treatment resulted in a modified transcript abundance for 913 of the 22,392 genes represented on the ATH1 chip. Salinity stress and equally the trehalose and sorbitol therapies marginally up-regulated AtRD22, whilst the other BURP loved ones genes were rarely affected (Figure S6D). The four genes demonstrating the finest modify in transcript abundance between wild type and mutant plants grown beneath non-pressured problems (Desk one) had been At4g33720 (encoding CAP, a PR
protein below the handle of the DREB2A tanscription factor, : up-regulated by twelve fold in equally rd22-one and uspl1 in comparison to wild type) At5g49700 (encoding a DNA-binding protein related with dampness stress [fifty three]: up-controlled by 56 fold in rd22-one and by forty fold in uspl1) At2g27550 (encoding ATC, a systemic inhibitor of floral initiation : up-controlled by 23 fold in the two rd22-one and uspl1) and At2g44380 (encoding a DC1domain that contains protein, concerned in the abiotic pressure response, : up-controlled by 22 fold in both rd22-one and uspl1). A complete of seventy seven genes displayed differential transcription among wild variety and rd22-one plants developed under non-pressured conditions 31 out of these are associated with either biotic or abiotic L67
regulatory pathways (Figure S7A) and incorporated 8 encoding a peroxidase putatively involved in H2O2 degradation. The absence of AtUSPL1 only re-programmed 18 genes, of which five (one particular encoding a peroxidase) are connected with either biotic or abiotic regulatory pathways (Figure S7B). Publicity to 150 mM NaCl resulted in the up-regulation of a quantity of genes connected with both humidity pressure or pathogen protection (Desk two). In rd22-one, out of the 764 differentially transcribed genes, 231 fell into one particular of these two types (Figure S7C), even though in the uspl1 mutant, only eighteen genes were up-controlled, of which 5 ended up related with possibly the biotic or the abiotic tension response (Figure S7D). In the latter mutant, AtRD22 was strongly up-controlled in the presence of salinity stress. When the pressure was applied by the addition of trehalose to the medium, 55 of the 171 differentially transcribed genes discovered in the rd22-one mutant have been connected with either the abiotic or the biotic tension reaction (Figure S7E).