Rice Science ›› 2022, Vol. 29 ›› Issue (3): 247-256.DOI: 10.1016/j.rsci.2021.07.012
收稿日期:
2021-06-17
接受日期:
2021-07-12
出版日期:
2022-05-28
发布日期:
2022-03-10
. [J]. Rice Science, 2022, 29(3): 247-256.
Fig. 1. Protein sequence analysis of OsABT and phylogenetic relationships of OsABT and its homologous proteins in plants. A, Multiple sequence alignment of OsABT and AtABT. WD-1 to WD-7 show the amino acid sequences of seven tryptophan-aspartate (WD) domains. B, Domain analysis of OsABT protein. The pink solid rectangle represents low compositional complexity, and the ruler represents the number of amino acids. C, Phylogenetic relationships of OsABT and its homologs in other plant species. The phylogenetic tree was generated in MEGA 6.0. Bootstrap values were 1 000 replications.
Fig. 2. Gene structure of OsABT and subcellular localization of OsABT protein. A, Comparison of gene structure between OsABT and AtABT. B, Protein location analysis of OsABT in Arabidoposis roots using confocal laser scanning microscopy. The three top images show free green fluorescence protein (GFP) signal, and the three subsequent images show GFP-OsABT fusion proteins. Scale bars, 20 μm.
cis-element | Sequence | Position from ATG | Biological function |
---|---|---|---|
ABRELATERD1 | ACGTG | -1851, -1321 | ABA responsive element |
ABRERATCAL | MACGYGB | -1694 | ABA responsive element |
EBOXBNNAPA | CANNTG | -1264, -1089, -781, -762, -590 | ABA responsive element |
DRE2COREZMRAB17 | ACCGAC | -232 | ABA responsive element, dehydration-responsive element |
PROXBBNNAPA | CAAACACC | -846 | ABA responsive element |
GT1CONSENSUS | GRWAAW | -515 | Salt responsive element |
MYB1AT | WAACCA | -459, -401 | Dehydration-responsive element |
MYB2AT | TAACTG | -353 | Dehydration-responsive element |
MYB2CONSENSUSAT | YAACKG | -1669, -353, -169 | Dehydration-responsive element |
MYCCONSENSUSAT | CANNTG | -1827, -1264, -1089, -781, -762, -590 | Dehydration-responsive element |
DRECRTCOREAT | RCCGAC | -1581, -880, -232 | Dehydration-responsive element |
CBFHV | RYCGAC | -1581, -880, -232 | Dehydration-responsive element |
ACGTATERD1 | ACGT | -1858, -1852, -1322, -995 | Required for etiolation-induced expression of erd1 (early responsive to dehydration) |
LTRECOREATCOR15 | CCGAC | -1581, -1566, -1035, -880, -840, -232 | Low-temperature-responsive element |
LTRE1HVBLT49 | CCGAAA | -517 | Low-temperature-responsive element |
CCAATBOX1 | CCAAT | -876, -377 | Heat stress response element |
BIHD1OS | TGTCA | -1556, -653, -336 | Binding site of OsBIHD1 in disease resistance response |
Table 1. cis-elements that respond to abscisic acid (ABA) and stress in OsABT promoter.
cis-element | Sequence | Position from ATG | Biological function |
---|---|---|---|
ABRELATERD1 | ACGTG | -1851, -1321 | ABA responsive element |
ABRERATCAL | MACGYGB | -1694 | ABA responsive element |
EBOXBNNAPA | CANNTG | -1264, -1089, -781, -762, -590 | ABA responsive element |
DRE2COREZMRAB17 | ACCGAC | -232 | ABA responsive element, dehydration-responsive element |
PROXBBNNAPA | CAAACACC | -846 | ABA responsive element |
GT1CONSENSUS | GRWAAW | -515 | Salt responsive element |
MYB1AT | WAACCA | -459, -401 | Dehydration-responsive element |
MYB2AT | TAACTG | -353 | Dehydration-responsive element |
MYB2CONSENSUSAT | YAACKG | -1669, -353, -169 | Dehydration-responsive element |
MYCCONSENSUSAT | CANNTG | -1827, -1264, -1089, -781, -762, -590 | Dehydration-responsive element |
DRECRTCOREAT | RCCGAC | -1581, -880, -232 | Dehydration-responsive element |
CBFHV | RYCGAC | -1581, -880, -232 | Dehydration-responsive element |
ACGTATERD1 | ACGT | -1858, -1852, -1322, -995 | Required for etiolation-induced expression of erd1 (early responsive to dehydration) |
LTRECOREATCOR15 | CCGAC | -1581, -1566, -1035, -880, -840, -232 | Low-temperature-responsive element |
LTRE1HVBLT49 | CCGAAA | -517 | Low-temperature-responsive element |
CCAATBOX1 | CCAAT | -876, -377 | Heat stress response element |
BIHD1OS | TGTCA | -1556, -653, -336 | Binding site of OsBIHD1 in disease resistance response |
Fig. 3. Expression profiles of OsABT under stress. A?C, Expression patterns of OsABT in response to abscisic acid (ABA) (A), NaCl stress (B) and PEG8000 treatment (drought simulation) (C). RNA was extracted from rice roots at 0 (control), 1, 3, 6, 12 and 24 h after treatments with ABA (50 μmol/L), NaCl (150 mmol/L) and PEG8000 (10 g/mL). OseEF-1α was used as an internal reference. Data are Mean ± SD (n = 3).
Fig. 4. Response of transgenic OsABT Arabidopsis lines (1-5 and 4-5) to abscisic acid (ABA). A, OsABT was detected in Col-0 and transgenic lines of Arabidopsis, with AtUBQ10 as an internal reference. B, Analysis of the greening rate of transgenic OsABT Arabidopsis on Murashige and Skoog (MS) medium and MS medium containing ABA (1 μmol/L). C, Statistic analysis of greening rate of transgenic lines at 14 d after germination. Data are Mean ± SD (n = 3). Asterisks represent significant differences between transgenic Arabidopsis lines and Col-0 plants (Student’s t-test, *, P < 0.05; **, P < 0.01).
Fig. 5. Response of transgenic OsABT Arabidopsis to salt stress. A, Greening rate analysis of transgenic lines 1-5 and 4-5 on Murashige and Skoog (MS) medium and MS medium containing NaCl (125 mmol/L). B, Statistical analysis of greening rate of transgenic lines 1-5 and 4-5 at 5, 6, 7 and 8 d after germination, respectively. Data are Mean ± SD (n = 3). Significant differences compared with Col-0 (Student’s t-test): *, P < 0.05; **, P < 0.01.
Fig. 6. Response of transgenic Arabidopsis overexpression OsABT lines (1-5 and 4-5) to drought stress. A, Eleven-day-old seedlings of Col-0 and transgenic Arabidopsis overexpression lines were transplanted into different pots and grew for 14 d (before drought stress). Then, water was withheld for 2 weeks (after drought stress), after which the plants were rewatered for 1 week (after water recovery). The photos were taken at the time of before drought stress, after drought stress and after water recovery, respectively. B, Survival rates of transgenic lines 1-5 and 4-5 after drought stress compared with Col-0, respectively. Three independent biological replicates were applied. Data are Mean ± SD (n = 48, Student’s t-test, *, P < 0.05).
Fig. 7. Interaction between OsABT and OsABI2 as measured via bimolecular fluorescent complimentary assay. OsABT-YFPN and OsABI2-YFPC were co-localized in Nicotiana benthamiana leaf cells. Scale bars, 20 μm.
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