The botanical magazine = Shokubutsu-gaku-zasshi

, Volume 95, Issue 3, pp 309–315 | Cite as

Time of application of Niagara 10637 for induction of maleness or femaleness inRicinus communis Linn.

  • Mary Varkey
  • Ravindra K. Nigam


Ethyl hydrogen-1-propylphosphonate (Niagara 10637) at concentrations of 500, 1000 and 2000 mg/l had two different effects on sex expression ofRicinus communis L. cvIari 132. Higher concentrations (1000 and 2000 mg/l), applied just before emergence of inflorescence i.e. to 90 day old plants, induced a marked increase in female flower number and reduced the number of male flowers on the first inflorescence. However, there was a tendency towards maleness on the second and third inflorescences. When applied to 60 day old plants, the test compound induced a high degree of maleness on the first and second inflorescences. Sex expression was not markedly altered with treatments at still younger stages (seeds and seedlings).

Key words

Femaleness Maleness Niagara 10637 Ricinus 


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Copyright information

© The Botanical Society of Japan 1982

Authors and Affiliations

  • Mary Varkey
    • 1
  • Ravindra K. Nigam
    • 1
  1. 1.Department of BotanyChrist Church CollegeKanpurIndia

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