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Low level expression of prokaryotic tzs gene enhances growth performance of transgenic poplars

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Abstract

We modulated the level of a hormone gene expression in poplars using either 35S promoter (p35S) of cauliflower mosaic virus (CaMV) or aux promoter (pAUX) of A. rhizogenes. The transgenic poplars (Populus alba × P. tremula var. glandulosa), in which the bacterial trans-zeatin secretion (tzs) gene was attached either to the 35S promoter or to the aux promoter, were compared for their performance in tissue culture as well as in nursery. Northern blot analysis of total RNA probed with tzs coding region showed that the total tzs mRNA expression by p35S was approximately 200–300-fold higher than that driven by pAUX. In contrast, the cellular zeatin content of p35S-tzs transgenic poplars was merely 13-fold of those found in pAUX-tzs plants. Due to different levels of cellular zeatin levels, the two types of transgenic poplars showed different morphogenetic as well as growth responses. The p35S-tzs transgenic plants showed morphological characteristics typical of those treated with cytokinin in culture. These include multiple axillary shoot formation, thick stems, narrow leaves and absence of roots. In contrast, the pAUX-tzs plants had slightly higher cellular cytokinin levels than did control plants and showed a lower degree of cytokinin-related phenotypes, including a few axillary shoots in root-inducing media. Since p35S-tzs did not develop roots, only pAUX-tzs transgenic poplars could be transplanted to the nursery where they resumed a close-to-normal growth. Nevertheless, pAUX-tzs plants transferred to the nursery developed cytokinin-related phenotypes, including greater number of shoots, smaller leaves and slightly retarded growth in height, but with a high total biomass.

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Authors and Affiliations

  1. Biotechnology Division, Korea Forest Research Institute, Suwon, Kyunggi-do, 441-350, Republic of Korea

    Young Im Choi & Eun Woon Noh

  2. Department of Applied Biology, ChungNam National University, Daejon, 305-764, Republic of Korea

    Kwan Sam Choi

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  1. Young Im Choi
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  2. Eun Woon Noh
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Correspondence to Eun Woon Noh.

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Communicated by R. Hampp.

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Choi, Y.I., Noh, E.W. & Choi, K.S. Low level expression of prokaryotic tzs gene enhances growth performance of transgenic poplars. Trees 23, 741–750 (2009). https://doi.org/10.1007/s00468-009-0316-1

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