InteraÃÃo famÃlias por ambientes e seleÃÃo de clones de batata resistentes à pinta preta e tolerantes ao calor. / Families x environments interaction and selection of potato clones to early blight resistance and heat tolerance.

AUTOR(ES)

Gustavo Andrà Simon

DATA DE PUBLICAÇÃO

2005

RESUMO

Potato breeding programs for tropical conditions require some specific aspects which should be considered to lead to successful results. Included among these aspects are the selection of clones adapted to heat stress and with reasonable level of resistance to early blight. Early blight is a common disease in the tropics and is caused by Alternaria solani. Another breeding strategy that has been studied for both temperate and tropical environments is the evaluation of families in the first clonal generations, instead of individual clones, allowing the use of replications and families performance in multiple environments. In this sense, studies were performed with the objectives a) to measure the families x environments interaction and evaluate family selection efficiency in early generations; and b) to identify potato clones associating high levels of resistance to early blight and to heat stress. To evaluate families x environments interaction 22 families and two control cultivars were grown in three locations in Minas Gerais state, Brazil. Estimates of expected genetic gains from selection in the average of environments allowed reasonable success for tuber yield per plant. Also, three other experiments were performed to evaluate heat tolerance and resistance to early blight. One experiment was conducted during the winter season and the other two during the water season. Results indicated a high significant interaction for large tubers and tuber specific gravity. It was shown that there was no association between heat tolerance and early blight resistance. Three clones were identified showing heat tolerance and responsiveness to environmental improvement and also with high levels of resistance to early blight.

ASSUNTO(S)

batata early blight seleÃÃo selection clone pinta-preta potato melhoramento vegetal clone

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