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Changes in water relations, photosynthetic activity and proline accumulation in one-year-old olive trees (Olea europaea L. cv. Chemlali) in response to NaCl salinity

100%

Ahmed C. B., Rouina B. B., Boukhris M.

Acta Physiologiae Plantarum

2008

tom 30

nr 4

The comparative responses of young olive trees (Olea europaea L. cv ‘‘Chemlali’’) to different NaCl salinity levels were investigated over 11 months. Oneyear- old own rooted plants were grown in 10-L pots containing sand and perlite mixture (1:3 v/v). Trees were subjected to three irrigation treatments: CP (control plants that were irrigated with fresh water); SS1 (salt stressed plants irrigated with water containing 100 mM NaCl) and SS2 plants (salt stressed plants irrigated with water containing 200 mM NaCl). Shoot elongation rate, relative water content, leaf water potential and net carbon dioxide exchange rates decreased significantly with increased NaCl salinity level. Under stressed conditions, the increase of Na+ and Cl- ions in both leaves and roots was accompanied with that of proline and soluble sugars. The above results show that the accumulation of proline and sugars under stressed conditions could play a role in salt tolerance. The absence of toxicity symptoms under both stress treatments and the superior photosynthetic activity recorded in SS1-treated plants suggest that cv Chemlali is better able to acclimatize to 100 mM NaCl than at 200 mM NaCl. Our findings indicate that saline water containing 100 mM NaCl, the most available water in arid region in Tunisia, can be recommended for the irrigation of cv Chemlali in the arid south of Tunisia.

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Alternate bearing affects nutritional status and net assimilation rate of an irrigated olive grove under arid conditions

76%

Bedbabis S., Rouina B. B., Camposeo S., Clodoveo M. L., Gallotta A., Palasciano M., Ferrara G.

Acta Scientiarum Polonorum. Hortorum Cultus

2017

tom 16

nr 2

Alternate bearing is a typical behavior of various fruit tree crops and is common among olive cultivars (Olea europæa L. var. sativa Hoffm. e Lk.). Since this phenomenon affects yield and consequently oil production, it is a concern for olive oil industry in order to offer a constant olive oil amount each year. A 4-year field experiment was conducted on cv Chemlali olive trees in ‘on’ and ‘off’ years in order to study, under arid conditions, both annual macro-element balance and net photosynthetic activity. Shoots growth was much higher in the ‘off’ year with respect to the ‘on’ one (+11.70 cm vs. +2.60). Net photosynthesis rate was much higher in the ‘off’ year with respect to the ‘on’ year and the highest values were observed at spring, when there is an intense vegetative growth. Differences for the mineral elements were observed between the ‘on’ and ‘off’ years. Nitrogen accumulated in leaves mainly in spring in the ‘off’ year, whereas high N values were detected also at the end of summer in the ‘on’ year. Consequently, N fertilization can be accomplished in February–March and possibly after harvest (November–December) to be used at budburst in the successive season. A difference was found between leaf P concentrations in ‘on’ or ‘off’ years from flowering to fruit-set, with the lowest values in the ‘on’ year, in particular in June–July. A supply of P at autumn–winter and partially in spring–summer in particular in an ‘on’ year would be appropriate. K accumulated in leaves in ‘on’ year from spring to summer, thus a supply of K in January–February, before new vegetation, for trees either in ‘on’ or ‘off’ year can be necessary for supporting and implementing the root system activity and the successive shoot growth (‘off’ year) and fruit development (‘on’ year). These results should be useful to partially reduce, through an appropriate fertilization schedule, the alternate bearing in olive tree.

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 Acta Scientiarum Polonorum. Hortorum Cultus

2 Rouina B. B.

1 Ahmed C. B.

1 Bedbabis S.

1 Boukhris M.

1 Camposeo S.

1 Clodoveo M. L.

1 Ferrara G.

1 Gallotta A.

1 Palasciano M.

1 2017

1 2008

Wyniki wyszukiwania

Changes in water relations, photosynthetic activity and proline accumulation in one-year-old olive trees (Olea europaea L. cv. Chemlali) in response to NaCl salinity

Alternate bearing affects nutritional status and net assimilation rate of an irrigated olive grove under arid conditions