Journal of Ornamental Horticulture
  • Year: 2008
  • Volume: 11
  • Issue: 4

Direct organogenesis from ray and disc florets of a chlorophyll variegated chrysanthemum

  • Author:
  • S.K. Datta, A.K.A. Mandal1
  • Total Page Count: 3
  • Page Number: 257 to 259

1Plant Physiology and Biotechnology Division, UPASI-TRF, Coimbatore. subodhskdatta@rediffmail.com

Madhyamgram Experimental Farm, Acharya J C Bose Biotechnology Innovation Center, Bose Institute, 24-Parganas (N), Kolkata-7000129

Abstract

‘Kargil 99’ is a small flowered chrysanthemum variety having spoon shaped, single whorr purplish mouve ray florets with yellow disc and snow white variegation on leaves. Both ray and disc florets from half open flower heads were cultured on Murashige and Skoog's (MS) medium supplemented with different concentrations of BA and NAA. Direct shoot organogenesis was observed within 20–25 days. Disc florets were more organogenic than ray florets. The highest (75%) organogenic response with 11 shoots per responding explant was obtained from disc florets in 1 mg/litre NAA aan 5.0 mg/litre BA treatment. Shoots werereoted on 0.2 mg/litre NAA containg half strength MS medium. Survival of plantlets was 100% upon transfer to the field conditions where they flowered true-to-type.

Keywords

chlorophyll variegation, chrysanthemum, direct shoot regeneration, disc floret