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Thermal requirements for seed germination of underutilized Lippia species

E. Mattana,M. Sacande,K. Sanogo,R. Lira,P. Gómez-Barreiro,M. Rogledi,T. Ulian

Published 2017 in South African Journal of Botany

ABSTRACT

Abstract Seed germination requirements of three underutilized Lippia (Verbenaceae) species were investigated. Seeds of L. graveolens, L. javanica and L. multiflora were incubated at a range of constant temperatures (5–35 °C) in the light (12 h light/12 h darkness). The effect of GA 3 and KNO 3 on seed germination was also tested in the same range of germination temperatures. Germination responses to accumulated temperature were then characterized by a thermal time approach. Two different trends of germination response to temperature were detected among species, regardless of the applied treatment. Seeds of L. graveolens and L. javanica started to germinate at 15 °C, reached their maximum germination at 25 °C and then decreased at warmer temperatures, while those of L. multiflora reached their maximum at the highest tested temperature (35 °C). Base temperature for germination (T b , °C) and the thermal constant for 50% germination (S, °Cd) of untreated seeds were ca. 2.5 and 7.5 °C and 76.92 and 84.3 °Cd, for L. graveolens and L. javanica , respectively. A T b of ca. 20 °C could only be roughly estimated for L. multiflora , due to the low germination achieved at temperatures 3 and KNO 3 had an overall inefficacy on enhancing seed germination of these species. Thermal thresholds of treated seeds could also be estimated for L. javanica , with a T b of ca. 11 °C for both treatments and a S of 70.92 and 69.44 °Cd for GA 3 and KNO 3, respectively. Practical applications of the findings of this study may support the propagation of these underutilized Lippia species.

PUBLICATION RECORD

  • Publication year

    2017

  • Venue

    South African Journal of Botany

  • Publication date

    2017-03-01

  • Fields of study

    Agricultural and Food Sciences, Biology, Environmental Science

  • Identifiers
    DOI 10.1016/J.SAJB.2016.12.020
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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