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Plant Chloroplast DNA Extraction Protocol (Lazo Lab, USDA)
http://wheat.pw.usda.gov/~lazo/methods/lazo/dnaplc...


CHLOROPLAST DNA ISOLATION
Grind in blender with 7 vol LL for maize, 10 for sorghum. Use MCE at 350 g/L, and if necessary, 5 ml 1 M DIECA/L. Cut leaves into ca. 1" strips prior to blending.
Squeeze through cheesecloth, Miracloth.
Centrifuge in GSA/JA14 rotors, if necessary. 10 min at 500 rpm GSA; 10 min at 570 rpm JA14.
Pellet chloroplasts in GSA/JA14; 15 min at 3000 rpm GSA; 15 min at 3100 rpm JA14.
Resuspend with pipet, in LL without MCE, etc. (ca. 300 ml/250 g).
Centrifuge 10 min in SS34/SA600/JA17 rotors: SS34 600 rpm; SA600 530 rpm; JA17 560 rpm.
Pellet chloroplasts 15 min in SS34/SA600/JA17 rotors: SS34 3000 rpm; SA600 2700 rpm; JA17 2800 rpm.
Note: Use of small rotors preferable.
Resuspend with pipet in LL, ca. 250 ml/100 g. Centrifuge as in 7.
Resuspend with pipet in LL, ca. 10 ml/100 g if possible.
Add MgCl2 to 10 mM (100 l 1M/10 ml); DNase to 100 g/ml (250 l 2 mg/ml/10 ml). Incubate 60 min at room temperature.
Bring to about 250 ml/100 g with MM; centrifuge as in 7; resuspend with pipet in MM to ca. 80 ml; centrifuge as in 7.
Resuspend with pipet in NN; minimum volume, ca. 5 ml/100 g.
Add SDS to 0.5% (250 l of 10%/5 ml NN). Swirl.
Add Proteinase K to 200 g/ml (500 l of 20 mg/ml/5ml). Swirl.
Lyse 60 min at 37 C. (Go to Dellaporta for Sorghum).
Maize: 3 standard phenol:chloroform extractions, ethanol precipitation.
3Â¥2011-03-13 11:18:32
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Originally posted by Ò»ÇúÇåÐÄ at 2010-09-21 16:03:49:
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