SeleÃÃo divergente para duraÃÃo do ciclo vegetativo em batata / Divergent selection for growth cycle duration in potato

AUTOR(ES)

Gabriel Belfort Rodrigues

DATA DE PUBLICAÇÃO

2006

RESUMO

The potato taken to Europe was adapted to the conditions of cool temperatures and short days. After approximately 200 years, through non intentional selection, potato became adapted to the conditions of long European photoperiod, and became cultivated at several countries. In Brazil, most cultivars were bred in temperate countries . Thus, the potato crop suffers the adverse effects of the high temperatures and of the short days. Those climatic conditions contribute to decrease tuber yield, mainly through the reduction in the duration of the growth cycle. Both in tropical and temperate conditions, late clones are reportedly more productive than clones with short growth cycle. Thus, extending the growth cycle may be an alternative to increase tuber yield. This work aimed at (i) evaluating the selection potential to increase or to decrease the potato growth cycle and (ii) to verify the relationship between growth cycle duration and tuber yield. In one experiment tuber yield and the growth cycle duration were evaluated for 1561 different genotypes from 22 sib families. In another experiment, the same characteristics were evaluated for 320 genotypes selected from early (78, 85 and 92 DAP), intermediate (99 and 106 days after planting - DAP) and late (113 and 120 DAP) clones . In both experiments, the cultivars Monalisa, Atlantic and Asterix, and the clones CBM 16-16 and CBM 9-10 were used as checks. The divergent selection in the initial generations was efficient both to decrease as well as to increase the growth cycle. The selection for growth cycle based on individuals performance allows a larger gain than the selection among families. In general, the latest genotypes are more productive than the earliest genotypes.

ASSUNTO(S)

quantitative genetic genetic breeding melhoramento vegetal melhoramento genÃtico tuber yield genÃtica quantitativa seleÃÃo precoce early selection correlation produÃÃo de tubÃrculo correlaÃÃo

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