Browsing by Author "Martiz Martiz, Johanna Paola"
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- ItemAbsorption and distribution of calcium (Ca-45) applied to the surface of orange (Citrus sinensis) fruits at different developmental stages(Multidisciplinary Digital Publishing Institute (MDPI), 2022) Bonomelli De Pinaga, Claudia María; Fernandez, Victoria; Capurro Marín, Franco Adolfo; Palma Soler, Carola Paz; Videla, Ximena; Rojas Silva, Ximena; Nario, Adriana; Martiz Martiz, Johanna PaolaIn this study, the rate of absorption and transport of calcium (Ca) in orange fruits (Citrus sinensis cv. Fukumoto) after surface treatment with Ca-45 was evaluated by supplying treatments at different dates between fruit set and mid-phase II of growth (i.e., 30, 44, 66 and 99 days after full bloom, DAFB). Ca-45 absorption was always detected, but Ca-45 application at the fruit set was associated with the highest rates of Ca transport into the pulp (39%) compared to the other treatments (17-19%). Scanning electron microscopy SEM) images of the fruit surface showed the occurrence of stomata along with the entire rind at all the developmental stages evaluated. However, from the beginning of stage I, stomata began to collapse and develop plugs, and this became frequent as the fruit age increased. From 44 DAFB, oil gland density increased, and Ca oxalates (CaOx) were found in the fruit flavedo and albedo. Fruit Ca (not labeled) concentration increased from fruit set (30 DAFB) to 99 DAFB, although oil gland formation and rind growth and differentiation likely hindered Ca transport to internal fruit tissues (pulp). The total Ca concentration in the pedicel was always higher than that in the fruit, with no differences between the first three treatments. The information obtained in this study may be essential for improving Ca fertilizer efficacy in citrus by spray applications.
- ItemPhysiological and Growth Responses of W. Murcott Tangor Grafted on Four Rootstocks under Water Restriction(2024) Tobar Amar, Sophia Antonia; Gil Montenegro, Pilar Macarena; Schaffer, Bruce; Schwember Neira, Andrés Ricardo; Cautín, Ricardo; Martiz Martiz, Johanna PaolaCitrus orchards in semi-arid regions are increasingly exposed to drought conditions due to climate change. This study compared the physiological and growth responses of ‘W. Murcott’ tangor (WM) grafted onto Citrus macrophylla (M), Swingle citrumelo (SC), C-35 citrange (C35), or bitter citrandarin (C22) rootstock subjected to two irrigation treatments: daily irrigation to replace 100% of the water lost daily by evapotranspiration (ET; control treatment) or daily irrigation to replace 75% of the water lost daily by ET (water deficit treatment). For trees in each treatment, leaf gas exchange, relative chlorophyll content, chlorophyll fluorescence, midday stem water potential, trunk cross-sectional area, and shoot length were measured 46 days after treatments were initiated. The results showed that WM on SC or C22 rootstock exhibited isohydric behavior, where decreased stomatal conductance limited transpiration in the water deficit treatment. WM on M rootstock exhibited an anisohydric response in the water deficit treatment, where there was no stomatal control of water loss by transpiration. Among the rootstocks tested for WM, the most tolerant to soil water deficit was SC, whereas trees on M rootstock were the most negatively affected by soil water deficit.
- ItemPortainjerto de citricosMartiz Martiz, Johanna Paola
- ItemVariedades de cítricosMartiz Martiz, Johanna Paola