Chloroplast-like organelles were found in enucleate sieve elements of transgenic plants overexpressing a proteinase inhibitor.

@article{Xie2007ChloroplastlikeOW,
  title={Chloroplast-like organelles were found in enucleate sieve elements of transgenic plants overexpressing a proteinase inhibitor.},
  author={Jun Xie and Xue-Zhi Ouyang and Kuai-fei Xia and Yu-Feng Huang and Wen-Bi Pan and Ying-Peng Cai and Xinping Xu and Baojian Li and Zeng-Fu Xu},
  journal={Bioscience, biotechnology, and biochemistry},
  year={2007},
  volume={71 11},
  pages={2759-65}
}
SaPIN2a, a plant proteinase inhibitor from nightshade (Solanum americanum), was located to the enucleate sieve elements (SEs) of phloem. The expressed SaPIN2a in transgenic lettuce showed inhibition of plant endogenous trypsin- and chymotrypsin-like activities, suggesting that SaPIN2a can regulate proteolysis in plant cells. To further investigate the physiological role of SaPIN2a, we produced transgenic nightshade and lettuce plants overexpressing SaPIN2a from the cauliflower mosaic virus… CONTINUE READING