Two ABA-responsive proteins from pea (Pisum sativumL.) are closely related to intracellular pathogenesis-related proteins
✍ Scribed by Enrique A. Iturriaga; Mark J. Leech; D. H. Paul Barratt; Trevor L. Wang
- Book ID
- 104618777
- Publisher
- Springer
- Year
- 1994
- Tongue
- English
- Weight
- 628 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0167-4412
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✦ Synopsis
We report here the isolation of cDNAs encoding two abscisic acid-responsive pea (Pisum sativum L.) proteins, ABR17 and ABR18, which are synthesized during late seed development in vivo. Southern blot analyses suggest that ABR17 cDNA corresponds to a single-copy gene, but ABR18 is one member of a family of closely related sequences in the pea genome. The deduced amino acid sequences of ABR17 and ABR18 cDNAs showed similarity to those of the pea disease resistance response proteins, to pathogenesis-related and to stress-induced proteins in other species and to the major birch pollen allergen Betvl.
Abscisic acid (ABA) is a plant growth substance which plays a key role in many physiological and developmental processes such as water relations, seed maturation, dormancy and germination. Environmental challenges such as freezing, water stress caused by either high osmoticum, salt or drought, and wounding increase endogenous ABA levels in plant cells. Under these stress conditions, specific mRNAs and gene products also accumulate [8,11,20,23]. These accumulation products have been categorized into three broad classes [17]: (1) those inducible by stress and ABA, (2) those inducible by stress but not ABA, and (3) those inducible by ABA but not stress. It