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Master's Dissertation
DOI
https://doi.org/10.11606/D.11.1985.tde-20220208-053224
Document
Author
Full name
Mariana Zatarin
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1985
Supervisor
Title in Portuguese
Comportamento de progênies de alface (Lactuca sativa) em diferentes épocas de plantio
Keywords in Portuguese
ALFACE
ÉPOCA DE PLANTIO
PROGÊNIES
Abstract in Portuguese
A alface é a hortaliça folhosa mais consumida "in natura" e apresenta sérios problemas de pendoamento prematuro no cultivo de verão em regiões tropicais. Tendo em vista estes problemas realizou-se um trabalho com os objetivos de selecionar genótipos com as características desejadas comercialmente, no que se refere a: tipo de planta; tamanho de planta; pendoamento tardio, aliados a folha fina, brilhante e de coloração verde claro. O trabalho constou de quatro experimentos, no delineamento de blocos casualizados com três repetições em dois locais distintos: Piracicaba/SP e Moji-das-Cruzes/SP, nas épocas de setembro/83, novembro/83, janeiro/84 e abril/84. Utilizaram-se 21 cultivares e 55 progênies de alface. Pendoamento prematuro foi avaliado apenas nas condições de Piracicaba. As análises de variância simples e conjunta foram feitas para identificação das interações tratamento x local x época. Os resultados permitiram as seguintes conclusões: - A melhor época de plantio para o cultivo em Piracicaba foi a 1 (setembro/83) que proporcionou pendoamento mais tardio às cultivares e progênies. Em contrapartida, a melhor época para a seleção visando resistência ao pendoamento foi a época 3 (janeiro/84) que permitiu melhor discriminação dos materiais em função da ocorrência de temperaturas mais altas nesse período; - As progênies que se destacaram conjuntamente para todos os caracteres avaliados foram: 22, 45, 47, 48, 49, 50, 51, 52, 54, 57, 58, 60, 62, 63, 64, 65, 67, 68, 69 e 70. A progênie 31 apresentou-se como a mais sensível ao pendoamento durante os três primeiros ensaios. Na época 4 (abril/84) revelou-se um excelente material para o cultivo de inverno, em ambos os locais, reunindo todas as características desejadas comercialmente.
Title in English
Progenies performance of lettuce (Lactuca sativa L.) in different planting seasons
Abstract in English
Lettuce is unique among the major vegetables in its nearly exclusive use as a fresh, raw product. It features serious problems of early bolting as a summer crop in tropical regions. Several quality traits must be maintained and considered in breeding programmes. Thereby, experimental data were obtained for the following characters, commercially important: plant type; increased plant size; bolting, allied to type, colour and texture of leaf. The research consisted of trials in randomized complete block design, in four planting seasons: September/83, November/83, January/84 and April/84, over two locations: Piracicaba/SP and Moji-das-Cruzes/SP, where 21 cultivars and 55 progenies were tested. The slow bolting trait was evaluated in Piracicaba only. The experimental results allowed the following conclusions: - The best planting schedule in the summer crop in Piracicaba was the season 1 (September/84) that allowed for slow bolting of cultivars and progenies. On the other hand, selection for slow bolting resistance was best in season 3 (January/84) that provided for a better discrimination among the accessions because of the high temperatures in this season; - The most promissing progenies, which stood out for all characters, were: 22, 45, 47, 48, 49, 50, 51, 52, 54, 57, 58, 60, 62, 63, 64, 65, 67, 68, 69, and 70. Progeny 31 was the most sensitive to early bolting during the three first trials. In the fourth season it showed to be an excellent material for the winter crop in both locations, summing up all the commercially desired qualities.
 
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Publishing Date
2022-02-08
 
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