Propagation daily light integral and root-zone temperature influence rooting of single-internode Pennisetum × dadvena culm cuttings

W. Garrett Owen, Roberto G. Lopez

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Crown division, tissue culture, and culm cuttings are methods for propagating purple fountain grass [Pennisetum ×advena Wipff and Veldkamp (formerly known as Pennisetum setaceum Forsk. Chiov. ‘Rubrum’)]. However, propagation by culm cuttings is becoming an economically attractive method for quick liner production. Our objective was to quantify the impact of propagation daily light integral (PDLI) and root-zone temperature (RZT) on root and culm development of single-internode purple fountain grass culm cuttings. Before insertion into the rooting substrate, cuttings were treated with a basal rooting hormone solution containing 1000 mg•L−1indole-3-butyric acid (IBA) + 500 mg•L−11-naphthaleneacetic acid (NAA). The cuttings were placed in a glass-glazed greenhouse with an air temperature of 23 °C and benches with RZT set points of 21, 23, 25, or 27 °C. PDLIs of 4 and 10 mol•m−2•d−1(Expt. 1) or 8 and 16 mol•m−2•d−1(Expt. 2) were provided. After 28 d, culm and root densities (number) increased as the RZT increased from 21 to 27 °C, regardless of PDLI during Expt. 1. Compared with 4 mol•m−2•d−1, a PDLI of 10 mol•m−2•d−1generally resulted in the greatest root biomass accumulation. For example, as PDLI increased from 4 to 10 mol•m−2•d−1, root dry mass increased by 105%, 152%, and 183% at RZTs of 21, 25, and 27 °C, respectively. In Expt. 2, as the RZT increased from 21 to 23 °C, root dry mass increased by 70% under a PDLI of 8 mol•m−2•d−1. However, root dry mass was similar among all RZTs under a PDLI of 16 mol•m−2•d−1. Our results indicate that single-internode culm cuttings of purple fountain grass can be most efficiently propagated under PDLIs of 8–10 mol•m−2•d−1together with RZT set points of 23 to 25 °C for quick liner production.

Original languageEnglish
Pages (from-to)176-182
Number of pages7
JournalHortScience
Volume53
Issue number2
DOIs
StatePublished - Feb 2018

Bibliographical note

Publisher Copyright:
© 2018, American Society for Horticultural Science. All rights reserved.

Keywords

  • Basal heating
  • DLI
  • Medium temperature
  • Purple fountain grass
  • Supplemental lighting

ASJC Scopus subject areas

  • Horticulture

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