Abstract:
:Introduction of the pea (Pisum sativum L.) lectin (PSL) gene into white clover (Trifolium repens L.) hairy roots facilitates nodulation by the nitrogen-fixing bacterium Rhizobium leguminosarum biovar viciae, which normally nodulates pea and not white clover (C.L. Diaz, L.S. Melchers, P.J.J. Hooykaas, B.J.J. Lugtenberg, and J.W. Kijne [1989] Nature 338: 579-581). Here, we show that PSL is functionally expressed in transgenic white clover hairy roots transformed with the PSL gene. PSL could be isolated from these roots by affinity chromatography. Immunoanalysis of PSL showed the presence of polypeptides corresponding to the PSL precursor and its [beta] subunits. In addition, we developed a highly sensitive localization technique based on specific binding of a glycan moiety of rat IgE to PSL. Similar to the situation in pea roots, PSL appeared to be localized on the external cell surface of elongated epidermal cells and on the tips of emerging and growing root hairs of transgenic white clover hairy roots. PSL was not observed on normal white clover roots and on hairy roots without the PSL gene. These results show that (a) in transgenic white clover hairy roots, PSL is correctly processed and targeted to root cells susceptible to rhizobial infection, and (b) like in pea roots, PSL is surface bound with at least one of its two sugar-binding sites available for (rhizobial) ligands.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Diaz CL,Logman T,Stam HC,Kijne JWdoi
10.1104/pp.109.4.1167subject
Has Abstractpub_date
1995-12-01 00:00:00pages
1167-1177issue
4eissn
0032-0889issn
1532-2548pii
109/4/1167journal_volume
109pub_type
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