Effect and interaction of temperature and photoperiod on growth and partitioning in three groundnut (Arachis hypogaea L.) genotypes1 uri icon

abstract

  • Effect of temperature and photoperiod and their interaction on -plant growth and partitioning of dry matter to pods was examined in three selected groundnut genotypes viz., TMV 2, N C Ac 17090 and VA 81B. The genotypes were grown in six walk-in growth chambers which were programmed to simulate three temperature regimes (22/18°C, 26/22°C and 30/26°C day/night) each under long (12 h) and short (9 h) photoperiods. The plant growth rates and partitioning ofdry matter to pods were estimated on a thermal time basis.Plant growth (PLGR) was significantly influenced by tp""1T'1P.T::.tJ toperiod and genotype, whereas pod growth rate (PLGR) was primarily by temperature and genotype. The interaction of genotype with photoperiod and with temperature was significant for both PLGR and PDGR. For example, at the 22/18°C temperature regime, VA 81B had a high PDGR, while NC Ac 17090 did not even initiate pod growth. The partitioning of dry matter to pods (Pf) was also significantly influenced by photoperiod, temperature and genotype, and significant interactions were found. Photoperiod did not significantly affect Pf under the low temperature regime, but at higher temperatures, partitioning to pods was significantly under short days. Pf of VA 81B was relatively insensitive to photoperiod compared with the other two genotypes. study provided evidence of genotypic variability for photoperiod x temperature interactions which could influence adaptation of groundnut to new environments

publication date

  • 1994
  • 1994