Role of geranylgeranyl reductase gene in organ development and stress response in olive (Olea europaea) plants

Functional Plant Biology - Tập 36 Số 4 - Trang 370 - 2009
Leonardo Bruno1, Adriana Chiappetta1, Innocenzo Muzzalupo2, Cinzia Gagliardi1, Domenico Iaria1, Alessandro Bruno1, Maria Greco1, Donato Giannino3, Enzo Perri2, Maria Beatrice Bitonti1
1Department of Ecology, University of Calabria, Ponte Bucci, 87036 Arcavacata di Rende, Cosenza, Italy.
2CRA - Centro di Ricerca per l'Olivicoltura e l'Industria Olearia (CRA-OLI), C.da Li Rocchi, 87036 Rende (CS), Italy.
3Institute of Biology and Agricultural Biotechnology, National Research Council of Italy (CNR), via Salaria km 29300, 00015 Monterotondo Scalo, Rome, Italy.

Tóm tắt

The NADPH-dependent geranylgeranyl reductase gene (OeCHLP) was characterised in olive (Olea europaea L.). OeCHLP catalyses the formation of carbon double bonds in the phytolic side chain of chlorophyll, tocopherols and plastoquinones and, therefore, is involved in metabolic pathways related to plant productivity and stress response, besides to nutritional value of its products. The nuclear OeCHLP encodes a deduced product of 51 kDa, which harbours a transit peptide for cytoplasm-to-chloroplast transport and a nicotinamide binding domain. Two estimated identical copies of gene are harboured per haploid genome of the cv. ‘Carolea’ used in the present study. Levels and cytological pattern of OeCHLP transcription were investigated by quantitative RT–PCR and in situ hybridisation. In line with the presence of ubiquitous tocopherols and/or chlorophyll, OeCHLP transcripts were present in various organs of plants. In leaves and fruits at different developmental stages, OeCHLP was differentially expressed in relation to their morpho-physiological features. An early and transient enhancement of gene transcription was detected in leaves of different age exposed to cold treatment (4°C), as well as in fruits mechanically wounded. Moreover, OeCHLP transcripts locally increased in specific cell domains of fruits severely damaged by the pathogen Bactrocera olea. Combined, these data show that OeCHLP expression early responds to biotic and abiotic stressful factors. Levels of tocopherols also increased in leaves exposed to cold conditions and fruits severely damaged by pathogen. We suggest that gene activity under stress condition could be related to tocopherol action.

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Functional Plant Biology

Tập 36 Số 4

370

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