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1.
Figure 5.

Figure 5. From: Quantitative Profiling of Arabidopsis Polar Glycerolipids in Response to Phosphorus Starvation. Roles of Phospholipases Dζ1 and Dζ2 in Phosphatidylcholine Hydrolysis and Digalactosyldiacylglycerol Accumulation in Phosphorus-Starved Plants.

Concentration of individual species in lipid classes of PC and DGDG in roots of wild type, pldζ1, pldζ2, and pldζ1pldζ2 under phosphorus starvation condition. Three-day-old seedlings in each genotype were transferred to the phosphorus starvation condition (0 μm phosphate). After 7 additional days, the rosettes and roots were harvested for lipid analysis by ESI-MS/MS. Data were expressed as mean ± sd (n = 5). *, Difference in that particular lipid species is significant as compared with wild-type roots (P < 0.05).

Maoyin Li, et al. Plant Physiol. 2006 October;142(2):750-761.
2.
Figure 4.

Figure 4. From: Quantitative Profiling of Arabidopsis Polar Glycerolipids in Response to Phosphorus Starvation. Roles of Phospholipases Dζ1 and Dζ2 in Phosphatidylcholine Hydrolysis and Digalactosyldiacylglycerol Accumulation in Phosphorus-Starved Plants.

Concentration of PC, PA, DGDG, MGDG, PG, PI, PS, and PE in rosettes and roots of wild type, pldζ1, pldζ2, and pldζ1pldζ2 under the phosphorus starvation condition. Three-day-old seedlings in each genotype were transferred to the phosphorus starvation condition (0 μm phosphate). After 7 additional days, the rosettes and roots were harvested for lipid analysis by ESI-MS/MS. A, Concentration of eight lipid classes in rosettes of wild type, pldζ1, pldζ2, and pldζ1pldζ2 under the phosphorus starvation condition. B, Concentration of eight lipid classes in roots of wild type, pldζ1, pldζ2, and pldζ1pldζ2 under the phosphorus starvation condition. Data were expressed as mean ± sd (n = 5). The marker H indicates that the PC concentration was significantly higher in pldζ1pldζ2 than in wild type (P < 0.05). The marker L indicates that the DGDG concentration was significantly lower in pldζ1pldζ2 than in wild type (P < 0.05).

Maoyin Li, et al. Plant Physiol. 2006 October;142(2):750-761.
3.
Figure 1.

Figure 1. From: Quantitative Profiling of Arabidopsis Polar Glycerolipids in Response to Phosphorus Starvation. Roles of Phospholipases Dζ1 and Dζ2 in Phosphatidylcholine Hydrolysis and Digalactosyldiacylglycerol Accumulation in Phosphorus-Starved Plants.

Effect of phosphorus on the growth of Arabidopsis rosettes and roots. Wild-type seeds (Columbia) were sterilized and germinated on 500 μm phosphate agar plates. Three-day-old seedlings were transferred onto five agar plates with 500 μm phosphate (+P) or five agar plates with 0 μm phosphate (−P). To each plate, 25 seedlings were transferred. After 7 additional days, the rosettes and roots were harvested for dry weight. A, Rosettes or roots from one agar plate were harvested as one sample for dry weight. B, Dry weight ratio of roots over rosettes. Five plates were measured for the ratio. Data are the means of five replicates ±sd (n = 5).

Maoyin Li, et al. Plant Physiol. 2006 October;142(2):750-761.
4.
Figure 7.

Figure 7. From: Quantitative Profiling of Arabidopsis Polar Glycerolipids in Response to Phosphorus Starvation. Roles of Phospholipases Dζ1 and Dζ2 in Phosphatidylcholine Hydrolysis and Digalactosyldiacylglycerol Accumulation in Phosphorus-Starved Plants.

Possible involvement of PLDζ1/2 in the PC hydrolysis and DGDG accumulation during phosphorus starvation. In this scheme, DAG is shown to be generated by three pathways, the PLD pathway, the PLC pathway, and the de novo pathway. In the PLD pathway, PC is hydrolyzed by PLDζs to PA, and then PA is further hydrolyzed by purple acid phosphatase (PAP) to DAG and inorganic phosphorus under severe phosphorus-limited conditions. Under moderate phosphorus deficiency conditions, PLDζ1 and PLDζ2 might function to modulate root growth for better nutritional absorption by increasing PA to stimulate root growth. In the PLC pathway, PC is hypothesized to be hydrolyzed to DAG. DAG can be used as a substrate by MGD2/3 to produce MGDG, from which DGDG is synthesized by DGD1/2.

Maoyin Li, et al. Plant Physiol. 2006 October;142(2):750-761.
5.
Figure 3.

Figure 3. From: Quantitative Profiling of Arabidopsis Polar Glycerolipids in Response to Phosphorus Starvation. Roles of Phospholipases Dζ1 and Dζ2 in Phosphatidylcholine Hydrolysis and Digalactosyldiacylglycerol Accumulation in Phosphorus-Starved Plants.

Expression of 12 PLD genes in rosettes (A) and roots (B) of wild type under 500 μm phosphate and 0 μm phosphate conditions. Three-day-old seedlings were transferred to the indicated concentration of phosphate, 500 μm phosphate (+P) or 0 μm phosphate (−P), respectively. After 7 additional days, the rosettes and roots were harvested for total RNA isolation and real time PCR. The levels of expression are expressed relative to the expression level of UBQ10. Values are the mean of three replicates ±sd (n = 3).

Maoyin Li, et al. Plant Physiol. 2006 October;142(2):750-761.
6.

Figure 6. From: Quantitative Profiling of Arabidopsis Polar Glycerolipids in Response to Phosphorus Starvation. Roles of Phospholipases Dζ1 and Dζ2 in Phosphatidylcholine Hydrolysis and Digalactosyldiacylglycerol Accumulation in Phosphorus-Starved Plants.

Concentration of individual molecular species in lipid classes of lysoPC, lysoPE, and lysoPG in rosettes and roots of wild type, pldζ1, pldζ2, and pldζ1pldζ2 under 500-μm and 0-μm phosphate conditions. Three-day-old seedlings were transferred to the indicated plates, containing 500 μm phosphate (+P) or 0 μm phosphate (−P). After 7 additional days, the rosettes and roots were harvested for lipid analysis by ESI-MS/MS. A and B, Rosettes and roots of wild type, respectively. C and D, Rosettes and roots of pldζ1, respectively. E and F, Rosettes and roots of pldζ2, respectively. G and H, Rosettes and roots of pldζ1pldζ2, respectively. Data are expressed as mean ±sd (n = 5). *, Lipid species is significantly different in the two phosphate conditions (P < 0.05).

Maoyin Li, et al. Plant Physiol. 2006 October;142(2):750-761.
7.
Figure 2.

Figure 2. From: Quantitative Profiling of Arabidopsis Polar Glycerolipids in Response to Phosphorus Starvation. Roles of Phospholipases Dζ1 and Dζ2 in Phosphatidylcholine Hydrolysis and Digalactosyldiacylglycerol Accumulation in Phosphorus-Starved Plants.

Concentration of individual molecular species in lipid classes of PI, PG, PS, PE, PC, PA, DGDG, and MGDG in rosettes and roots of wild-type Arabidopsis under 500 μm and 0 μm phosphate conditions. Three-day-old seedlings were transferred to the indicated concentration of phosphate plates, 500 μm phosphate (+P) or 0 μm phosphate (−P), respectively. After 7 additional days, the rosettes and roots were harvested for lipid analysis by ESI-MS/MS. A, Individual lipid molecular species in rosettes under two phosphorus conditions. B, Alteration in individual lipid species in rosettes between two phosphorus conditions. C, Individual lipid molecular species in roots under two phosphorus conditions. D, Alteration in individual lipid species in roots between two phosphorus conditions. Data are expressed as mean ± sd (n = 5). *, Difference in that particular lipid species under two phosphorus conditions is significant (P < 0.05).

Maoyin Li, et al. Plant Physiol. 2006 October;142(2):750-761.

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