, 214:19 | Cite as

Late-acting self-incompatibility: a barrier to self-fertilization in sunnhemp (Crotalaria juncea L.)

  • Maruthi Rangappa Thimmaiah
  • Shashi Bhushan Choudhary
  • Hariom Kumar Sharma
  • Arroju Anil Kumar
  • Hemraj Bhandari
  • Jiban Mitra
  • Pran Gobinda Karmakar


In search of causal factors underlying perceived allogamy in sunnhemp (Crotalaria juncea L.), we investigated the breeding system and pollen–pistil interaction. Floral biology study in the species established Fabaceae type hermaphrodite zygomorphic flower with dimorphic anthers. Study of the breeding system revealed preferential success of allogamy despite delayed autonomous selfing mechanism characteristically prevailing in the species. Pollen–pistil interaction study in selfed and crossed pistils revealed significant differences in pollen tube growth rates inside the pistil. Further, in self-pollinated pistils callose formation observed at and around nucellus cells suggesting the late-acting type of self-incompatibility mechanism in the species. To the best of our knowledge, this is the first scientific communication underscoring the prevalence of self-incompatibility mechanism in sunnhemp.


Crotalaria juncea L. Sunnhemp Self-incompatibility Pollen tube 



Authors are thankful to Director ICAR-CRIJAF, Barrackpore for providing resources and facilities for conducting the experiment. We also acknowledge Dr. S. K. Pandey for extending assistance in conducting of field experiment and Dr. P. Satya for providing access to the fluorescent microscope in his lab.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest in the manuscript.


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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Maruthi Rangappa Thimmaiah
    • 1
  • Shashi Bhushan Choudhary
    • 1
  • Hariom Kumar Sharma
    • 1
  • Arroju Anil Kumar
    • 1
  • Hemraj Bhandari
    • 1
  • Jiban Mitra
    • 1
  • Pran Gobinda Karmakar
    • 1
  1. 1.ICAR-Central Research Institute for Jute and Allied FibresKolkataIndia

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