A proteinase inhibitor II of Solanum americanum is expressed in phloem

@article{Xu2001API,
  title={A proteinase inhibitor II of Solanum americanum is expressed in phloem},
  author={Zeng-Fu Xu and W H Qi and Xue-Zhi Ouyang and Edward C Yeung and M. -L. Chye},
  journal={Plant Molecular Biology},
  year={2001},
  volume={47},
  pages={727-738}
}
Although proteinase inhibitor proteins are known to confer insect resistance in transgenic plants, their endogenous roles remain undefined. Here, we describe the expression of a proteinase inhibitor II (PIN2) protein from Solanum americanum in phloem of stems, roots and leaves suggesting a novel endogenous role for PIN2 in phloem. The phloem consists of parenchyma cells, sieve elements (SE), and companion cells (CC) which are in close association with SE. We isolated two cDNAs encoding PIN2… CONTINUE READING
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