Rice Science ›› 2023, Vol. 30 ›› Issue (2): 138-147.DOI: 10.1016/j.rsci.2023.01.006
收稿日期:
2022-04-29
接受日期:
2022-07-29
出版日期:
2023-03-28
发布日期:
2023-01-16
. [J]. Rice Science, 2023, 30(2): 138-147.
Fig. 1. Effects of different concentrations of NaCl on growth performance of rice seedlings under P-sufficient (+P) and P-deficient (-P) conditions. A, Growth performances of rice seedlings under +P and -P conditions with different NaCl concentrations for 1, 4 and 7 d. Scale bars, 1 cm. B and C, Root (B) and shoot (C) biomasses of rice under +P or -P conditions with different NaCl concentrations. Data are Mean ± SD (n = 4). Asterisks indicate significant difference at P < 0.05 by the Student’s t test.
Fig. 2. Effects of 10 mmol/L NaCl on soluble P contents in root (A) and shoot (B) of rice under P-sufficient (+P) and P-deficient (-P) conditions for 1, 4 and 7 d. Data are Mean ± SD (n = 4). Different lowercase letters above the bars indicate significant differences at P < 0.05 by one-way analysis of variance.
Fig. 3. Effects of 10 mmol/L NaCl on transcription levels of OsSPX1 (A), OsSPX3 (B), OsSPX5 (C) and OsSPX6 (D) in rice roots under P-sufficient (+P) and P-deficient (-P) conditions for 7 d. OsActin was used as a reference gene. Data are Mean ± SD (n = 4). Different lowercase letters above the bars indicate significant differences at P < 0.05 by one-way analysis of variance.
Fig. 4. Effects of 10 mmol/L NaCl on P contents in cell wall (A and F) and pectin (B and G), uronic acid contents in pectin (C and H), pectin methylesterase (PME) activities (D and I) as well as pectin methyl esterification degrees (E and J) of rice roots and shoots under P-sufficient (+P) and P-deficient (-P) conditions for 1, 4 and 7 d. Data are Mean ± SD (n = 4). Different lowercase letters above the bars indicate significant differences at P < 0.05 by one-way analysis of variance.
Fig. 5. Effects of 10 mmol/L NaCl on rice xylem P content in P-sufficient (+P) and P-deficient (-P) solution. Data are Mean ± SD (n = 4). The significant differences at P < 0.05 are indicated by different lowercase letters above the bars.
Fig. 6. Effects of 10 mmol/L NaCl on transcripts of OsPT2 (A), OsPT6 (B) and OsPT8 (C) in P-sufficient (+P) and P-deficient (-P) solution in rice roots for 7 d. OsActin gene was used as a reference gene. Data are Mean ± SD (n = 4). Different lowercase letters above the bars indicate significant differences at P < 0.05 by one-way analysis of variance.
Fig. 7. Effects of NaCl on root abscisic acid (ABA) content (A), as well as ABA on root (B) and shoot (C) soluble P concentrations in P-sufficient (+P) and P-deficient (-P) solution with or without 10 mmol/L NaCl in rice. Data are Mean ± SD (n = 4). The significant differences at P < 0.05 are indicated by different lowercase letters above the bars.
Fig. 8. Proposed diagram of action pattern of NaCl in P starved rice. First, exogenous NaCl significantly decreased the accumulation of endogenous abscisic acid (ABA), which in turn increased the content of pectin and the activity of pectin methylesterase (PME) to reuse the cell wall fixed P. Second, exogenous NaCl facilitated the root to shoot translocation of P by increasing the transcription level of OsPT6. PM, Plasma membrane; Pi, Inorganic phosphorus.
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