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Euphytica

, Volume 126, Issue 3, pp 299–308 | Cite as

Biometrical analysis of phosphorus use efficiency in lettuce cultivars adapted to high temperatures

  • Wallace Rudeck Sthel Cock
  • Antônio Teixeira do Amaral Júnior
  • Ricardo Enrique Bressan-Smith
  • Pedro Henrique Monnerat
Article

Abstract

With the objective of selecting phosphorus efficient lettuce cultivars adapted to high temperatures, one hundred and thirteen lettuce genotypes from the vegetable germplasm bank at CCTA-UENF, Rio de Janeiro, Brazil, were initially selected for resistance to bolting under greenhouse temperature ranging from 20 to 32 °C. Nineteen greater longevity genotypes were further selected and evaluated for efficiency and responsiveness to phosphorus in soils with 10 and 60 mg dm-3 of P. The estimated genetic parameters indicated that genetic gains from selection should be expected for all traits. Based on leaf and root dry weight, Mimosa and Regina genotypes were identified as efficient users of phosphorus in soils with low P content, while BGH 292 was inefficient. The genotype graphic dispersion based on the first three canonic variables confirmed Mimosa and Regina as efficient cultivars in soil with 10 mg dm-3 of P. Their efficiency seemed to be linked to greater capacity for phosphorus use by the plant top as well as greater root growth. Similarly, the poor performance of BGH 292 in the low P soil seemed to be associated with its low capacity of phosphorus use in the plant top and its small root growth. The α parameter identified the Mimosa genotype as efficient user but not responsive to high P levels and the Regina and BGH4064 genotypes as efficient and responsive. Mimosa is, therefore, best suited for low P-input production systems, while Regina and BGH 4064 are indicated for production systems that use P-fertilization.

genetic parameters genotype evaluation Lactuca sativa phosphorus use efficiency 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Wallace Rudeck Sthel Cock
    • 1
  • Antônio Teixeira do Amaral Júnior
    • 1
  • Ricardo Enrique Bressan-Smith
    • 1
  • Pedro Henrique Monnerat
    • 2
  1. 1.LMGV – CCTA – UENFCampos dos Goytacazes, RJBrazil
  2. 2.LFIT – CCTA – UENFCampos dos Goytacazes, RJBrazil

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