Heterosis, combining ability and gene action studies for insect-pest and disease resistance in cucumber

  • Ramesh Kumar Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India
  • Sandeep Kumar Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India
  • Dharminder Kumar Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India
  • Sandeep Kansal Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India

Abstract

The paucity of research pertaining to the heterosis, combining ability, nature of gene action and proportional contribution of lines, testers and their interactions for insect-pest and disease resistance in cucumber motivated us to undertake this study. The experimental material comprised 48 F1 hybrids, developed by crossing 16 lines (eight gynoecious) with three testers during the year 2011. Parents (16 lines and three testers) and their F1 48 hybrids, along with two standard checks (“KH-1” and “Pusa Sanyog”), were planted in a Randomized Complete Block Design (RCBD) during the year 2012 for screening against different insect-pest and diseases under natural field conditions. In the present studies, genotypes LC-1-1, LC-2-2, LC-15-5, CGN-20969, CGN-20953, Poinsette and K-75 and crosses LC-1-1 × K-75, LC-15-5 × K-75, LC-3-3 × K-75, CGN-20969 × Japanese Long Green, and CGN-20953 × K-75 were found superior in response to insect-pest and disease incidence. Gene action studies indicated predominant role of non-additive gene action governing all the traits except fruit fly incidence, thereby, indicating usefulness of heterosis for disease resistance breeding in cucumber. Further, proportional contribution of lines was recorded highest for severity of powdery mildew and angular leaf spot, whereas testers were found superlative for fruit fly incidence and severity of downy mildew. Therefore, selection of parents should be done depending upon the trait of interest for resistant hybrid development in cucumber.

Author Biographies

Ramesh Kumar, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India
Professor, Department of Vegetable Science, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India
Sandeep Kumar, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India

Dr Sandeep Kumar, Scientist, Vegetable Science, Indian Agricultural Research Institute (IARI) Regional Station, Katrain-175129 (Kullu Valley) HP, India

Dharminder Kumar, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India
Scientist, Department of Vegetable Science, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India
Sandeep Kansal, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India
Professor, Department of Vegetable Science, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan – 173 230, HP, India
Published
16-10-2018
Section
Research Article