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Euphytica

, Volume 109, Issue 1, pp 1–7 | Cite as

Inheritance of bolting tendency in lettuce Lactuca sativa L.

  • E.C. Silva
  • W.R. Maluf
  • N.R. Leal
  • L.A.A. Gomes
Article

Abstract

Resistance to early flowering is an important attribute of lettuce cultivars adapted to tropical conditions. Lettuce cultivars may vary widely in the number of days necessary from sowing to inflorescence formation and flowering. In this paper, we report on the polygenic inheritance of the number of days to flowering in two crosses among contrasting lettuce cultivars – Vitória × Brasil-303 and Babá × Elisa. F1 and F2 seed were obtained for each cross, and used to estimate broad sense heritabilities. F3 families were obtained from randonly sampled F2 plants, and used to estimate narrow sense heritabilities based on parent-offspring regression. Trials were carried out in plastic greenhouses in Campos dos Goytacazes, in the Northern part of the State of Rio de Janeiro, Brazil. Broad and narrow sense heritabilities for days to first anthesis were 0.737 and 0.489 for the cross Vitória × Brasil-303, and 0.818 and 0.481 respectively, for the cross Babá × Elisa. In both crosses, both early and late-flowering transgressive segregants were obtained. Genetic gains based on selection of late flowering transgressive segregants in the F2's were estimated to be 10.2 days in Vitória × Brasil-303 cross, and 8.7 days in the Babá × Elisa cross.

bolting heat resistance inflorescence formation inheritance late flowering lettuce breeding transgressive segregation 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • E.C. Silva
    • 1
  • W.R. Maluf
    • 2
  • N.R. Leal
    • 1
  • L.A.A. Gomes
  1. 1.Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes amp;Brazil
  2. 2.Departamento de AgriculturaUniversidade Federal de Lavras (UFLA)Lavras – MG –Brazil

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