Gabriela Vuletin Selak

Bio: Gabriela Vuletin Selak is an academic researcher. The author has contributed to research in topics: Rootstock & Pollen. The author has an hindex of 7, co-authored 25 publications receiving 204 citations.

Vegetative growth, superoxide dismutase activity and ion concentration of salt-stressed watermelon as influenced by rootstock

Abstract: Watermelon is a crop with a high water demand and is frequently grown under conditions of higher than normal root-zone salinity. In the present study, seedlings of watermelon (cv. Fantasy, Citrullus lanatus (Thunb.) Matsum & Nakai) were grown either ungrafted or grafted on three rootstocks: Strong Tosa, S1 (both Cucurbita maxima×Cucurbita moschata), or Emphasis (Lagenaria siceraria). All the plants were exposed to an NaCl-induced salinity stress (electrical conductivity, EC=2·2, 4·0, or 6·0 dS/m). The vegetative growth of all the plants substantially reduced after 2 weeks of exposure to 6·0 dS/m; however, growth of the plants grafted on Strong Tosa reduced less than that of the others. The leaf water content and specific leaf area (SLA, m2/g) decreased with an increasing salinity in grafted plants, but not in ungrafted plants. Salinity induced an increase of superoxide dismutase (SOD) activity in grafted plants up to two-fold depending on the rootstock, whereas it had no effect on this enzyme activity in ungrafted plants. Leaf Na+ concentration increased with increasing salinity in ungrafted and S1 grafted plants, whereas there was no significant leaf Na+ accumulation in Emphasis and Strong Tosa grafted plants. Leaf K+ concentration was affected by the rootstock but not by salinity, thus, the ability to keep a high K+/Na+ ratio was achieved mainly by limiting leaf Na+ concentration. The rootstock determined the leaf Cl− accumulation, with lower overall concentrations found if plants were grafted on the S1 rootstock than on Emphasis or ungrafted plants. Salinity significantly decreased the leaf NO3− concentration on Emphasis grafted plants only, while the NO3−/Cl− ratio was reduced in all the rootstocks. The capacity of Strong Tosa to withstand salt stress better than other tested rootstocks was probably due to the ability to induce anatomical adaptation (SLA) and SOD activity in response to salt stress, and also to the efficiency of Na+ exclusion from the shoot.

Reproductive Success after Self-pollination and Cross-pollination of Olive Cultivars in Croatia

Abstract: Olive orchard productivity largely depends on the choice of planted cultivars andtheirpollinationneeds.Orcharddesigns inCroatiaarechangingbecauseanumberof valuable foreign olive cultivars, mostly Italian, have been introduced in this region in the last 30 years. The compatibility relationships of introduced cultivars with autochthonous cultivars are unknown. With the objective of studying reproductive behavior of the most important Croatian cultivars (Drobnica, Lastovka, Levantinka, and Oblica) and their cross-pollination to recently introduced Italian cultivars Leccino and Pendolino, initial and final fruit set in self-pollination versus cross-pollination and free pollination were compared during three flowering seasons. Experiments were conducted in three different orchards (Kastela, Mravince, and Brac) to identify the effect of the environment on reproductive behavior of olive cultivars. The differences of fruit set in five olive cultivars after tested pollination treatments appeared at the time of initial fruit set. Increased final fruitsetundercross-pollinationswasobservedwhencomparedwithself-pollinationforall olive cultivars in all experimental orchards. In the Mravince orchard, a positive response to cross-pollination was consistent, and fruit set increased under cross-pollination in all cultivars and years with the exception of 'Levantinka' in which no significant differences were noticed between self-pollination treatment and cross-pollination treatments in 2005. Variable self-fertility behavior from season to season was found for tested cultivars. A self-incompatibility index (ISI) higher than 0.1 was recorded for 'Levantinka' in all experimental years and, therefore, classified it as a partially self-incompatible cultivar. Self-incompatibility response was observed for 'Lastovka'. The positive response to cross- pollination over self-pollination only in some experimental years classified 'Drobnica', 'Leccino', and 'Oblica' as partially self-incompatible. Results obtained from this study indicated that pollination efficiency is strictly combination-specific. The Italian cultivar, Leccino, was a successful pollen acceptor and pollenizer of most Croatian cultivars. Reciprocalhighsuccessincross-pollinationwasrecordedfor'Levantinka'and'Oblica'.In the Mravince orchard, 'Lastovka', 'Leccino', and 'Oblica' were efficient pollenizers of 'Levantinka' where the simultaneous flowering period was in accordance with their cross- compatibility. 'Levantinka' was a good pollenizer for 'Lastovka' in the Mravince orchard, and both cultivars entered into the flowering period earlier than other studied cultivars, whichwasnotthecaseintheothertwoorchards.Thevariationsinfloweringtimingamong orchards were a consequence of differences in environmental conditions. According to the high fruit sets recorded in 'Oblica' after pollination with 'Leccino' or 'Levantinka', an increase in tree productivity of the acceptor cultivar is expected in the presence of selected pollenizers in all olive-growing regions.

Annual review 腎臓

Abstract: １ Ｂａｓｉｃ ｎｅｐｈｒｏｌｏｇｙ（生理；免疫・病理；分子生物学；検査・診断） ２ Ｃｌｉｎｉｃａｌ ｎｅｐｈｒｏｌｏｇｙ（糸球体障害；尿細管・間質障害；全身性疾患と腎障害；水電解質異常；腎不全）

Biochemistry And Molecular Biology Of Plants

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