Abstract:
:In celery (Apium graveolens L.), long-distance transport of reduced carbon occurs both in the form of sucrose (Suc) and mannitol. The presence of mannitol has been related to the resistance of celery to salt stress. To investigate the transport events occurring during salt stress, we have cloned the H(+)/Suc transporter of celery AgSUT1 (A. graveolens Suc uptake transport 1) from a mature leaf cDNA library. The function of the encoded protein was confirmed by expression in yeast. AgSUT1 is a H(+)/Suc transporter with a high affinity for Suc (K(m) of 139 microM). Another closely related cDNA (AgSUT2) was also identified. AgSUT1 is mainly expressed in mature leaves and phloem of petioles, but also in sink organs such as roots. When celery plants were subjected to salt stress conditions (30 d watering with 300 mM NaCl) favoring mannitol accumulation (J.D. Everard, R. Gucci, S.C. Kann, J.A. Flore, W.H. Loescher [1994] Plant Physiol 106: 281-292), AgSUT1 expression was decreased in all organs, but markedly in roots. The results are discussed in relation to the physiology of celery.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Noiraud N,Delrot S,Lemoine Rdoi
10.1104/pp.122.4.1447subject
Has Abstractpub_date
2000-04-01 00:00:00pages
1447-55issue
4eissn
0032-0889issn
1532-2548journal_volume
122pub_type
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