Journal of Genetics

, Volume 97, Issue 5, pp 1451–1456 | Cite as

Genetics of resistance to Cercospora leaf spot disease caused by Cercospora canescens and Psuedocercospora cruenta in yardlong bean (Vigna unguiculata ssp. sesquipedalis) \(\times \) grain cowpea (V. unguiculata ssp. unguiculata) populations

  • Usa Duangsong
  • Kularb Laosatit
  • Prakit SomtaEmail author
  • Peerasak Srinives
Research Note


Yardlong bean (Vigna unguiculata ssp. sesquipedalis), a type of cowpea, is an important vegetable legume of Asia. Cercospora leaf spot (CLS) caused by Cercospora canescens and Psuedocercospora cruenta is an important phytopathological problem of the yardlong bean grown in tropical regions. The objectives of this study were to (i) determine mode of inheritance of resistance to CLS caused by C. canescens and P. cruenta, (ii) estimate the heritability of the resistance, (iii) estimate genetic effects on the resistance using six basic populations generated from the cross between the susceptible yardlong bean ‘CSR12906’ and the resistant grain cowpea (V.unguiculata spp. unguiculata) ‘IT90K-59-120’. Segregation for the resistance to both fungi in the F\(_{2}\) population fitted both 3 : 1 ratio and 13 : 3 ratio of susceptible:resistant, while that in the BC2 ((CSR12906\(\times \)IT90K-59-120)\(\times \)IT90K-59-120) population fitted a 1 : 1 ratio, suggesting one recessive gene or two genes with inhibitory gene action control the resistance. Generation mean analysis showed that a simple additive–dominance model was adequate to explain the genetic control of CLS disease resistance, indicating that a single gene controls the resistance. The average number of major genes (effective factors) controlling the resistance was estimated to be 1.05 and 0.92 for C. canescens and P. cruenta, respectively. The broad-sense heritability calculated for resistance to both diseases was higher than 0.90. Altogether, these results indicated that the resistance to CLS disease caused by C. canescens and P. cruenta in grain cowpea IT90K-59-120 is a highly heritable trait governed by a single major recessive gene.


cowpea yardlong bean Cercospora leaf spot generation mean analysis Cercospora canescens 



This research was supported by ‘2019 Research Fund’ of the Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University.


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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Faculty of Agriculture, Department of AgronomyKasetsart UniversityNakhon Pathom Thailand
  2. 2.Center for Advanced Studies for Agriculture and Food (CASAF)Kasetsart University Institute for Advanced Studies, Kasetsart UniversityBangkok Thailand
  3. 3.Royal Society of ThailandBangkok Thailand

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