The objective of this study was to evaluate the agronomic performance of the Geneva® series apple rootstocks G.202, G.213, G.210 and G.814. The rootstock G.202 and G.213 proved to be the less vigorous, being considered dwarfs. For replanting soil, ‘G.210’ was considered an efficient alternative. The ‘G.213’ was the most efficient, in a general point of view, demonstrating that it does not change its yield efficiency and stability characteristics, even under replanting conditions. All rootstocks reached the goal of 120 accumulated tons.ha-1 in Caxias do Sul-RS, highlighting the faster financial return to the growers. ‘G.213’ has higher soluble solids content, indicating the possibility of an earlier harvesting. It is concluded that the G.210 and G. 213 rootstocks are good options for the areas evaluated, under replanting conditions, mainly G.213 for more dense systems and G.210 for areas under extreme replanting conditions.
The aim of this study was: (i) understand how upstream signaling modulated TOR-SnRK1 nexus; and (ii) establish an interplay between SnRK1-TOR nexus, sugar availability, sucrolytic enzyme activities, expression level of key genes related to signalling and sugar metabolism, including trehalose, in in vitro-grown of ‘Myrobalan 29C’plum rootstock (Prunus cerasifera). Explants were cultivated in Murashigue and Skoog medium (MS) with trehalose (0; 1,0 and 10 mM). In 3 days, the antagonistic role of PcSnRK1 and PcTOR was confirmed in plants treated with 10mM trehalose, possibly indicating that ‘Myrobalan 29C’ was not in a stress condition. Furthermore, a PcTREA up-regulation was observed, which can lead to glucose accumulation, that in turn is precursor of sorbitol synthesis. Regarding the growth parameters evaluated after 21 days of in vitro culture, the uppermust number of shoots and explant length was observed at 10mM trehalose. Such positive response may be due to an increase in Glucose and UDP-Glc content, direct products of sucrose synthase (SuSy) enzyme. Consistent with these results, the highest availability of these molecules may be the upstream signal for TOR-activation. Interestingly, in this same condition, a sucrose accumulation was observed, which may also have contributed to PcTOR up-regulation and ameliorate in growth parameters.
As tangerinas representam o segundo maior grupo de frutos cítricos produzidos mundialmente. No Brasil, sua produção está concentrada na região Sudeste e Sul do país. A variedade mais cultivada nos pomares brasileiros é a tangerina ‘Ponkan’, muito apreciada para o consumo in natura. Nos últimos anos houveram mudanças no perfil dos consumidores e um aumento na busca por alimentos livres de resíduos. Novos métodos de conservação alternativos, como a utilização de recobrimentos e tratamentos físicos no armazenamento dos frutos vem sendo estudados. O objetivo deste trabalho foi avaliar a utilização dos recobrimentos fécula de mandioca e gelatina, aliados a aplicação de radiação UV-C, para prolongar a vida útil de tangerinas ‘Ponkan’ durante o armazenamento. O experimento foi inteiramente casualizado contendo como fatores de tratamento os recobrimentos fécula de mandioca 3% e gelatina, a aplicação de UV-C (com e sem) e dias de armazenamento (5, 10 e 15). Os resultados demonstraram que houve aumento do pH dos frutos tratados com fécula de mandioca e gelatina, com aplicação de UV-C. A perda de massa dos frutos aumentou com o período de armazenamento e para os SST não houveram diferenças entre os tratamentos. Os atributos de coloração indicam que a fécula de mandioca foi eficiente para manter a coloração dos frutos no armazenamento. Concluiu-se que a utilização de recobrimentos de fécula de mandioca 3% e gelatina não foram eficientes para manutenção dos atributos químicos de qualidade dos frutos de tangerina ‘Ponkan’ e a aplicação de radiação UV-C não teve efeito sobre os parâmetros analisados.
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