Papers by Gabino Hernan Reginato
Vitis: Journal of Grapevine Research, 2015
shown a marked influence on shoot proliferation rates for several species. However, in grapevines... more shown a marked influence on shoot proliferation rates for several species. However, in grapevines, only CHEE and PooL (1985) mention this fact and FANIZZA et al. (1984) found no seasonal differences when culturing grapevines apices in vitro. With respect to the explant position in the plant (axillary vs. apical buds), the results are contra dicting (YU and MEREDITH 1986; NOVAK and JUVOVA 1983; HWANG and KIM 1990; SUDARSONO and GOLDY 1991) probably due to its relation with the phenol content existing in the tissue (FANIZZA et al. 1984). The explant's size and physiological age are important factors in meristem selections for success in its survival and prolifera tion. However, no previous references were found in the literature concerning these aspects. The objective of this study was to evaluate the effect of the time (date) of cul ture as well as size and type of apex (apical or axillary) on the proliferation rate of shoots in three commercially important grapevine cultivars...
Acta Horticulturae, 2017
In Chile, apple chemical thinning uses primarily carbaryl, which is expected to be banned in the ... more In Chile, apple chemical thinning uses primarily carbaryl, which is expected to be banned in the future. New thinning chemicals are needed. During the 2013-14 season, two trials were conducted in a 'Brookfield Gala'/Pajam 2 orchard. Metamitron (Goltix Compact MR 90% WG, 450 g ai ha-1) or BA (Exilis ® , 180 g ai ha-1) plus NAA (NAA 800 ® , 18 g ai ha-1) were evaluated at different timings beginning at 4 mm up to 28 mm fruit diameter at 3 to 8 day intervals. Control treatments included, one without any spray and a sprayed control that included NAA at full bloom, carbaryl (Carbaryl 85 WP, 1368 g ai ha-1) at petal fall and BA (180 g ai ha-1) plus carbaryl (1368 g ai ha-1) at 12 mm fruit. All sprays were done when no carbohydrate deficit was predicted by Malusim Model (Cornell University). Thinning was evaluated on two branches tree-1 , fifty days after full bloom, as fruits per cluster (F/C). All treatments differed from the control (2.3 F/C). Metamitron treatments were more effective when applied between 8 and 16 mm fruit (1.0 F/C). NAA+BA treatments were more effective when applied right after petal fall (4 mm fruit; 1.3 F/C). After removing the effect of crop load, average fruit weight was increased with BA+NAA spray at 4 and 12 mm fruit. All treatments of metamitron were different from the control.
HortScience, 1999
Our objectives were to characterize the quality and maturity changes of peach [Prunus persica (L.... more Our objectives were to characterize the quality and maturity changes of peach [Prunus persica (L.) Batsch.] fruit cvs. O'Henry and Nos 21 during maturation and ripening and to identify harvest maturity indices by relating nondestructive and destructive variables. After fruit set, 400 fruit of similar diameter and tree position were tagged to follow maturation and ripening on the tree. During commercial harvest, 48 fruit were ramdomly harvested every 4 to 6 days. Ethylene evolution rate (EER) at 20 °C, fresh weight, and peel ground and cover color (L*, a*, b*, C* and Hue value) were measured to all 48 fruit. Flesh color, firmness at several fruit points, soluble solids (SS), pH, titratable acidity (TA), and SS/TA ratio were measured only to 24 fruit, and the rest were held for up to 7 days at 20 °C as a ripening period to measure the same characteristics previously mentioned. Pearson correlation coefficients were determined between variables to explore possible harvest maturity i...
Acta Horticulturae, 2002
The influence of canopy fruit position on the quality and maturity parameters was studied on peac... more The influence of canopy fruit position on the quality and maturity parameters was studied on peach fruit [Prunus persica (L.) Batsch.] cv. 'Angelus', during the 1998/99 Chilean season. Within the tree, after fruit set, fruit were marked at three positions: (a) the top, between 2.5-5.0m above ground level, with fruit completely exposed to sunlight; (b) the middle, between 1.0-2.5m above ground level, with fruit illuminated but not completely exposed to sunlight; and (c) the bottom, at 1.0m above ground level, with fruit inside the lower part of the canopy, not exposed to sunlight. Before, during and after harvest radiation levels were measured from the top, middle and bottom canopy. In addition, a leaf analysis was made in the position mentioned above. Six harvests were done and 20 fruit per harvest were collected. After the fruit reached a pulp temperature of 20ºC, individually and maintaining their identity, non destructive analyses were done (L*, C* and H ab ground and over color, ethylene evolution rate, fresh weight and diameter). Additionally, destructive analyses were made (flesh color, firmness, soluble solids concentration [SSC], titratable acidity [TA], SS/TA ratio and pH). Fruit ground and flesh color, percentage of over color, ethylene evolution rate, soluble solids concentration, and pH were greater at the top than in the lower positions of the canopy. The fruit size and fresh weight were reduced under shade conditions. Moderate and strong correlations existed between the log of ethylene production with fruit firmness, and also they showed the highest values of correlation coefficient (R) with the a* and H ab parameters of the ground and flesh color. This association was related to the fruit position within the tree.
Acta Horticulturae, 2008
... In peach (Prunus persica Batsch.) orchards, the fallow period can be up to 4 years or rotatio... more ... In peach (Prunus persica Batsch.) orchards, the fallow period can be up to 4 years or rotation to non-woody rooted crops; in sweet cherry (P. avium L.) trees, 18 to 20 years of fallow were suggested by Fregoni (1962), cited by Zucconi and Monaco (1986). ...
Para determinar el efecto de la carga frutal sobre el peso de frutos y la distribución de calibre... more Para determinar el efecto de la carga frutal sobre el peso de frutos y la distribución de calibres se realizó un ensayo en durazneros variedades Bowen, Andross y Ross. Árboles en plena producción, conducidos en vaso tipo californiano e implantados a 6x5 m fueron raleados manualmente 20 días después de iniciado el endurecimiento de carozo. La carga frutal quedó establecida en el rango de 750 a 1 350 frutos/planta en Bowen y Ross y entre 850 y 1400 frutos/planta en Andross. Se realizaron evaluaciones de tamaño final de frutos, producción total y producción destinada a mitades. En las tres variedades se estableció un alto grado de correlación entre la carga frutal y los tres parámetros de evaluación y se observó una respuesta similar a diferentes niveles de carga frutal. A medida que se incrementó la carga frutal, se lograron aumentos en la producción total, aunque disminuyó el peso de frutos. La producción destinada a mitades aumentó en relación con la carga frutal, hasta alcanzar val...
European Journal of Horticultural Science, 2019
ing. For that, the mean, maximum, and minimum temperatures were used to describe weather during t... more ing. For that, the mean, maximum, and minimum temperatures were used to describe weather during the autumns, winters, and early springs, for to be related with yield performance. Crop load-adjusted yield efficiency ranged between 10.1 and 6.8 kg m-2 PAR i , and fruit weight was found to be 134.4 g and 189.5 g among zones. The results showed that the crop load-adjusted yield and fruit size depended primarily on the maximum temperature during winter, and secondly, on season length (from bloom to harvest), with colder areas yielding better performance.
Investigacion Agricola, 1995
... Las anteras obtenidas de flores de primer dia de abiertas liberan mayor cantidad de polen via... more ... Las anteras obtenidas de flores de primer dia de abiertas liberan mayor cantidad de polen viable que las anteras provenientes de boton floral. ... [Incidence of wind and supplementary hand pollination on the fruit size of kiwi fruit] by Martin P, Rodrigo Hernan (1993) in Spanish. ...
The Journal of Horticultural Science and Biotechnology, 2007
Summary When fruit tree performance is evaluated in rootstock, thinning or other management trial... more Summary When fruit tree performance is evaluated in rootstock, thinning or other management trials, tree size and fruit number (or crop load) are the most important factors that confound the real effects of the treatments that are being evaluated. An experiment to assess the effects of tree size and crop load on yield efficiency and fruit size was conducted in a ‘Ross’ peach orchard on ‘Nemaguard’ rootstock in Malloa, Chile. Two groups of 15 trees each were selected according to tree size and were hand-thinned at the beginning of pit hardening to a wide range of crop loads within each tree size group, but keeping the average crop load similar between the two groups of trees. Fruits per tree (crop load) was either normalised or not normalised for tree size, assessed either as cm–2 of trunk cross-sectional area (TCSA) or the fraction of above-canopy photosynthetically-active radiation (PARf) intercepted by the canopy at harvest. At harvest, all the fruits were counted and weighed, and the average fruit weight calculated. Analysis of variance and covariance (with and without using crop load as a covariate), and regression analysis were performed and the results were compared. Differences in fruit size, yield efficiency (yield normalised by tree size) and total production between the two tree size groups were detected by ANOVA; but, by selecting the appropriate covariate, no differences between groups were detected. Thus, for a correct interpretation of the effect of treatment, in this case tree size, on tree performance measured as fruit size, yield, or yield efficiency, the differences in crop load (number of fruits per tree) must be removed by performing covariance analysis. Normalising crop load (fruits per tree) to account for tree size was essential for proper interpretation of the data. Calculating crop load using the fraction of light intercepted at harvest as the normalising factor was better than using TCSA as the normalising factor.
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Papers by Gabino Hernan Reginato