Effect of seaweed extracts and plant growth regulators on high-frequency in vitro mass propagation of Lycopersicon esculentum L (tomato) through double cotyledonary nodal explant

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• 作者：S. Vinoth (1)
  P. Gurusaravanan (1)
  N. Jayabalan (1)
  
• 关键词：Tomato ; Double cotyledonary nodal explants ; Sargassum wightii ; Gracilaria edulis ; Rhodophyta ; Phaeophyta
• 刊名：Journal of Applied Phycology
• 出版年：2012
• 出版时间：October 2012
• 年：2012
• 卷：24
• 期：5
• 页码：1329-1337
• 全文大小：436KB
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• 作者单位：S. Vinoth (1)
  P. Gurusaravanan (1)
  N. Jayabalan (1)
  
  1. Department of Plant Biotechnology, School of Life Sciences, Bharathidasan University, Tiruchirappalli-24, Tamil Nadu, India
  

文摘

An efficient and reproducible two-step in vitro propagation system for tomato (Lycopersicon esculentum) was developed by using the combinations of seaweed biostimulant (Gracilaria edulis and Sargassum wightii) extracts and plant growth regulators (PGRs). Double cotyledonary nodal (DCN) explants of Co-3 cultivar were initially cultured on Murashige and Skoog (MS) and Gamborg’s medium (B5) containing thidiazuron (TDZ) and 6-benzylaminopurine (BA); the best responding cytokinin was tested in combinations with different auxins (NAA, IAA and IBA), and seaweed extracts (G. edulis and S. wightii) of about basal MS medium +10-0% was used for shoot proliferation. The best organogenic culture response was obtained on MS medium fortified with 1.5?mg?L? TDZ and 1.5?mg?L? IBA. Up to 24 shoots per explants were formed at an optimal duration of exposure to 35?days. Mini shoots of about 3-?cm were transferred to medium supplemented with MS + iP, MS + zeatin, MS + G. edulis and MS + S. wightii at different concentrations. High frequency of shoot elongation was observed in the medium supplemented with 30% G. edulis (15.2?cm), and profuse rooting was observed in the medium supplemented with 50% S. wightii of about 16.1?cm. Shoot elongation and rooting were observed in the medium supplemented with seaweed extracts. The plantlets were transferred to the plant growth chamber (70% of relative humidity and 9 light cycles) and maintained in it for a week, and then they were transferred to a greenhouse condition. The plant growth chamber to green house transferred plantlets showed an increase in the survival rate from 70 to 85%. Thus a two-step regeneration protocol was developed in this study with a combination of seaweed extracts and PGRs, which provides a basis for the production of transgenics with high frequency and survivability of tomato plants.