Selection for water stress tolerance in Upland cotton in the northeast of Brazil

Authors

  • José G. de Souza Cenrto Nacional de Pesquisa do Algodao, EMBRAPA, C.P. 174. 58.100 - Campina Grande, Paraiba, Brazil
  • José A. Giles Cenrto Nacional de Pesquisa do Algodao, EMBRAPA, C.P. 174. 58.100 - Campina Grande, Paraiba, Brazil
  • Miguel B. Neto Cenrto Nacional de Pesquisa do Algodao, EMBRAPA, C.P. 174. 58.100 - Campina Grande, Paraiba, Brazil
  • Jorge Vieira da Silva Laborotoire d'Ecofogie générate et Appliquée, Université Paris VII, 2 Place Jussieu, 75005 Paris, France

Keywords:

Cotton, Phosphorus, Drought resistance

Abstract

Selection for leaf protoplasmic drought tolerance in Upland cotton was done using the release of inorganic phosphorous (P1) as a criterion of membrane damage and acid phosphatase activity increase. This screening methods can be used after either polyethylene glycol 600 (PEG) osmotic treatment, or heat treatment (50ºC) of leaf discs and it can be applied in a recurrent selection programme for drought resistance. Heritability of PED P1 release was 38% with a genetic gain of 12.5% for the second selection cycle and 11.9% for the third. Heritability of heat treatment P1 release was 30% with a genetic gain of 9.4 and 8.9% for the second and third cycles, respectively.

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Issue

Volume 61 Number 1

Section

Research Papers