Productive performance and vitamin c content in ananas comosus l. merrill submited to different periods of bloom induction

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Productive Performance and Vitamin C Content in Ananas comosus L. Merrill Submited to Different Periods of Bloom Induction

W.R.S. Cock1 and N. R. Leal2.
1Instituto Nacional de Colonização e Reforma Agrária – INCRA SR(20)
Vilha Velha, Espírito Santo, Brazil
2Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias
Universidade Estadual do NorteFluminense Darcy Ribeiro
Campos dos Goytacazes, Rio de Janeiro, Brazil

Keywords: Ananas comosus L. Merrill, Vitamin C (L-ascorbic acid).

ABSTRACT
The aims of this study was to analyse the production of pineapple cultivars ‘Perola’ and 'Smooth Cayenne', using slips weighting approximately 250g, under sprinkler irrigation after artificial bloom induction with ethefon at eight, nine, ten, eleven andtwelve months after the sowing. The fruits were harvested six months after the flowering induction in April, May, June, July and August months of 2003 an analyzed the fruit weight without crown (FWC), the firmness of the pulp, the Brix/Acidity ratio, the pH and vitamin C content (VC). Through the study of adaptability and yield stability by Lin and Bins (1988) methodology, information from theproductive performance of these genotypes cultivars to determine the best time to bloom induction was looked for. For the FWC characteristic, the cultivar 'Smooth Cayenne' showed a Pi 284,9424 and 'Pérola' Pi 17019,3931, showing the best productive performance of 'Smooth Cayenne', even in unfavorable environments, with Pi equal to 0.0 in this condition. For the VC characteristic, there was areversal, so we can detaching the good performance of 'Pérola', with 31.125 mg 100-1g of average and Pi equal to 0.0 against 10.804 mg 100-1g of average and Pi 250.1294 in the 'Smooth Cayenne'. In the decomposition of Pi in favorable and unfavorable environments, the magnitude of the 'Pérola' was 0.0 in both conditions, demonstrating high performance in the production of vitamin C.

INTRODUCTION
InBrazil, the pineapple crop assumes great economic importance, being the third tropical fruit tree in terms of harvested area, and having a widespread plantation in national territory. It is cultivated especially at Northeast and Southeast regions.
The south coast of Espírito Santo as Rio de Janeiro north coast stand out as great pineapple producer regions where the major genotypes are ‘Jupi’and ‘Pérola’, varieties basically destined for in natura consumption, whose harvests are concentrated at the months of November and December. However the plantation of genotype ‘Smooth Cayenne’ showed a considerable increase since the year of 2000 with the industrialization incentive occurred that year.
Since fruits can easily be obtained at different months of the year through planting seasonmanipulation and artificial bloom induction at different physiological ages, the study of genotypes interaction in various environments assumes the fundamental role in recommending the ideal genotype for each region when submitted to different planting seasons and bloom induction.
Therefore, the productive performance inquiry aimed to study the genotypes’ potential, in order to produce goodquality fruits between the months of January and September, when market prices are high due to the low offer.

MATERIALS AND METHODS
In this study, pineapple genotypes ‘Pérola’ and ‘Smooth Cayenne’ cultivated at UENF’s experimental station located at Colégio Agrícola “Antônio Sarlo” in Campos dos Goytacazes in the state of Rio de Janeiro were evaluated.
In February of 2002 vegetative propagulesweighting between 250 to 300 grams were planted, kept under sprinkle irrigation and artificially induced to bloom with Ethrel at eight, nine, ten and twelve months after plantation.
The fruits maturation and harvest occurred approximately six months after the bloom induction, respectively in the months of April, May, June, July and August of 2003. Then their weight without crown (FWC), pulp...
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