Abstract
FtsZ1-1 and MinD plastid division-related genes were identified and cloned from Brassica oleracea var. botrytis. Transgenic tobacco plants expressing BoFtsZ1-1 or BoMinD exhibited cells with either fewer but abnormally large chloroplasts or more but smaller chloroplasts relative to wild-type tobacco plants. An abnormal chloroplast phenotype in guard cells was found in BoMinD transgenic tobacco plants but not in BoFtsZ1-1 transgenic tobacco plants. Transgenic tobacco plants bearing the macro-chloroplast phenotype had 10 to 20-fold increased levels of total FtsZ1-1 or MinD, whilst the transgenic tobacco plants bearing the mini-chloroplast phenotype had lower increased FtsZ1-1 or absence of detectable MinD. We also described for the first time, plastid transformation of macro-chloroplast bearing tobacco shoots with a gene cassette allowing for expression of green fluorescent protein (GFP). Homoplasmic plastid transformants from normal chloroplast and macro-chloroplast tobacco plants expressing GFP were obtained. Both types of transformants accumulated GFP at ~6% of total soluble protein, thus indicating that cells containing macro-chloroplasts can regenerate shoots in tissue culture and can stably integrate and express a foreign gene to similar levels as plant cells containing a normal chloroplast size and number.
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Abbreviations
- Arc :
-
Accumulation and replication of chloroplasts
- CTAB:
-
Cetyl trimethylammonium bromide
- EST:
-
Expressed sequence tag
- MEGA:
-
Molecular evolutionary genetics analysis
- MS:
-
Murashige and Skoog
- rbcS:
-
Rubisco small sub-unit
- TIGR:
-
The Institute for Genomic Research
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Acknowledgments
Antibodies for AtFtsZ1-1 and AtMinD were generously provided by Prof. Katherine Osteryoung (Michigan State University, USA) and by Dr. Shin-ya Miyagishima (RIKEN, Japan), respectively.
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Communicated by R. Rose.
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Chikkala, V.R.N., Nugent, G.D., Stalker, D.M. et al. Expression of Brassica oleracea FtsZ1-1 and MinD alters chloroplast division in Nicotiana tabacum generating macro- and mini-chloroplasts. Plant Cell Rep 31, 917–928 (2012). https://doi.org/10.1007/s00299-011-1212-x
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DOI: https://doi.org/10.1007/s00299-011-1212-x