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- Author or Editor: Jonny E. Scherwinski Pereira x
The present work aimed to evaluate the plant growth of the apple rootstock Marubakaido during the acclimatization process, after receiving different treatments of temperatures. Apple shoots were rooted in vitro and transplanted to greenhouse, where they remained for 2 weeks. After this period, the plants were treated under temperature of 4 ± 1 °C and 10 ± 1 °C, 16-h photoperiod at 5μmol·m-2·s-1 radiation for 0; 360, 720, 1080, and 1440 h. The plants were transferred to the greenhouse where their growth internode length and bud number were evaluated during 2 months. It was verified that there was an increase up to 697% in the height of the plants when they were treated for 1440 h, independently of the temperature. The internode length was also larger when the plants were treated for greater periods. The temperature of 10 ± 1 °C led to a decrease in the bud number, while at 4 ± 1 °C, significant differences were not observed. These results suggest that the use of higher temperatures (10 ± 1 °C), can also recover the plant growth during the acclimatization process.
Aiming to improve plant growth of the apple rootstock cultivar Marubakaido (Malus prunifolia) in greenhouse, 1-year-old plants were sprayed once, twice, and three times in a 7-day interval with gibberellic acid (GA3) in the following concentrations: 0, 50, 100, 200, 400, 800 and 1600 mg•L-1. The plant growth was evaluated every 2 weeks during 2 months. The internode length, bud number, and the dry weight of the aerial part were also evaluated at the end of the experiment. It was verified that GA3 sprayed at 800 mg•L-1 by three times consecutively was the best treatment presenting the largest rate of plants growth (912% against 114% of nontreated plants) in relation to their initial height, besides providing larger internode length and dry matter weight of the aerial parts. However, using this regulator did not affect the plant bud number. Plants sprayed once did not present significant response to GA3 for any of the studied variables. These results suggest that the use of GA3 in 1-year-old apple plants reactivates growth, although, the increase in the number of applications associated with higher doses is necessary to improve the efficiency of this product.