Post-abscission, pre-dispersal seeds of Digitalis purpurea remain in a developmental state that is not terminated by desiccation ex planta

L. H. Butler; F. R. Hay; R. H. Ellis; R. D. Smith
March 2009
Annals of Botany;Mar2009, Vol. 103 Issue 5, p785
Academic Journal
: Background and Aims Seed quality may be compromised if seeds are harvested before natural dispersal (shedding). It has been shown previously that slow or delayed drying can increase potential quality compared with immediate rapid drying. This study set out to investigate whether or not there is a critical moisture content, below which drying terminates maturation events for seeds harvested after mass maturity but before dispersal. : Methods Seeds of foxglove (Digitalis purpurea) in the post-abscission pre-dispersal phase were held at between 15 and 95 % RH for 4 or 8 d, with or without re-hydration to 95 % RH for a further 4 d, before drying to equilibrium at 15 % RH. In addition, dry seeds were primed for 48 h at −1 MPa. Subsequent seed longevity was assessed at 60 % RH and 45 °C. : Key Results Rate of germination and longevity were improved by holding seeds at a wide range of humidities after harvest. Longevity was further improved by re-hydration at 95 % RH. Priming improved the longevity of the seeds dried immediately after harvest, but not of those first held at 95 % RH for 8 d prior to drying. : Conclusions Maturation continued ex planta in these post-abscission, pre-dispersal seeds of D. purpurea dried at 15–80 % RH at a rate correlated positively with RH (cf. ageing of mature seeds). Subsequent re-hydration at 95 % RH enabled a further improvement in quality. Priming seeds initially stored air-dry for 3 months also allowed maturation events to resume. However, once individual seeds within the population had reached maximum longevity, priming had a negative impact on their subsequent survival.


Related Articles

  • FOXGLOVES.  // Better Homes & Gardens;Jun2004, Vol. 82 Issue 6, p118 

    Describes electrical engineer Robert Keller's garden in Decatur, Georgia which is planted with foxgloves and other ornamental plants. Description of the Digitalis purpurea; Varieties; How to grow foxgloves.

  • Transition Time. Ulrich, Carolyn // Chicagoland Gardening;May/Jun2013, Vol. 19 Issue 3, p50 

    The article offers ideas for gardeners on what to plant during the in-between period of spring and summer, including foxglove or Digitalis purpurea and Linaria Fantasy Blue.

  • A new Digitalis hybrid. ARMITAGE, JAMES // Plantsman: New Series;Jun2015, Vol. 14 Issue 2, p86 

    The article focuses on the hybridisation of between Digitalis (Isoplexis) canariensis male plant and Digitalis purpurea female plant which was introduced by James Armitage in 2012. Topics discussed include intermediate difference between parents including typical D. canariensis in stems...

  • purpureaglycosides A and B.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p1946 

    A definition of the term "purpureaglycosides A and B" which refers to true cardiac glycosides found in the leaves of foxglove Digitalis purpurea is presented.

  • Cases of digitalis toxicity in the Department of Cardiology of the General Hospital of Kalamata. Michas, G.; Makaris, E.; Zompolos, S. // Archives of Hellenic Medicine / Arheia Ellenikes Iatrikes;May/Jun2013, Vol. 30 Issue 3, p369 

    A letter to the editor is presented which discusses several cases of cardiac glycoside admitted at the Cardiology Department of the General Hospital of Kalamata in Greece.

  • Foxgloves -- simply bewitching. Sutcliffe, Dave // Australian Horticulture;Apr2009, Vol. 107 Issue 4, p44 

    The article features the plant foxglove or Digitalis purpurea described as a mysterious and beautiful plant which is appreciated for its form and chemical makeup. It presents some of its common names including the Witches thimble, Fairies Petticoat and Blood flower. The toxin digitalin which is...

  • In vitro propagation and production of cardiotonic glycosides in shoot cultures of Digitalis purpurea L. by elicitation and precursor feeding. Patil, Jitendra; Ahire, Mahendra; Nitnaware, Kirti; Panda, Sayantan; Bhatt, Vijay; Kishor, Polavarapu; Nikam, Tukaram // Applied Microbiology & Biotechnology;Mar2013, Vol. 97 Issue 6, p2379 

    Digitalis purpurea L. (Scrophulariaceae; Foxglove) is a source of cardiotonic glycosides such as digitoxin and digoxin which are commercially applied in the treatment to strengthen cardiac diffusion and to regulate heart rhythm. This investigation deals with in vitro propagation and elicited...

  • purpureaglycosides A and B.  // Taber's Cyclopedic Medical Dictionary;2005, p1825 

    A definition of the term "purpureaglycosides A and B" is presented. It refers to true cardiac glycosides present in the leaves of Digitalis purpurea, foxglove.

  • Ultrastructural Evidence for a Dual Function of the Phloem and Programmed Cell Death in the Floral Nectary of Digitalis purpurea. Karl Peter Gaffal; Gudrun Johanna Friedrichs; Stefan El-Gammal // Annals of Botany;Apr2007, Vol. 99 Issue 4, p593 

    Background and Aims The floral nectary of Digitalis purpurea is a transitory organ with stomatal exudation of nectar. In this type of nectary, the nectar is thought to be transported to the exterior via intercellular ducts that traverse the nectariferous tissue. The latter is also traversed by a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics