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Three Drought-Responsive Members of the Nonspecific Lipid-Transfer Protein Gene Family in Lycopersicon pennellii Show Different Developmental Patterns of Expression1

Marcela B. Treviño and Mary A. O' Connell*

Graduate Program in Molecular Biology and Department of Agronomy and Horticulture, New Mexico State University, Las Cruces, New Mexico 88003-8003

Genomic clones of two nonspecific lipid-transfer protein genes from a drought-tolerant wild species of tomato (Lycopersicon pennellii Corr.) were isolated using as a probe a drought- and abscisic acid (ABA)-induced cDNA clone (pLE16) from cultivated tomato (Lycopersicon esculentum Mill.). Both genes (LpLtp1 and LpLtp2) were sequenced and their corresponding mRNAs were characterized; they are both interrupted by a single intron at identical positions and predict basic proteins of 114 amino acid residues. Genomic Southern data indicated that these genes are members of a small gene family in Lycopersicon spp. The 3'-untranslated regions from LpLtp1 and LpLtp2, as well as a polymerase chain reaction-amplified 3'-untranslated region from pLE16 (cross-hybridizing to a third gene in L. pennellii, namely LpLtp3), were used as gene-specific probes to describe expression in L. pennellii through northern-blot analyses. All LpLtp genes were exclusively expressed in the aerial tissues of the plant and all were drought and ABA inducible. Each gene had a different pattern of expression in fruit, and LpLtp1 and LpLtp2, unlike LpLtp3, were both primarily developmentally regulated in leaf tissue. Putative ABA-responsive elements were found in the proximal promoter regions of LpLtp1 and LpLtp2.

1   This work was supported in part by the New Mexico Agricultural Experiment Station, U.S. Department of Agriculture special grant no. SWCPGWR, and National Institutes of Health grant no. S06 GM08136 to M.A.O.
*   Corresponding author; e-mail moconnel{at}nmsu.edu; fax 1-505-646-6041.

Plant Physiol. (1998) 116: 1461-1468
Copyright Clearance Center:   0032-0889/98/116/1461/08
© 1998 American Society of Plant Physiologists




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