Himachal Journal of Agricultural Research

Gaurav Sharma ¹, Uttam Chandel ², Satish Kumar Guleria ³, Rakesh Devlash ³

Affiliations
1 Department of Genetics and Plant Breeding, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur-176 062, IN
2 CSKHPKV, Shivalik Agricultural Research and Extension Centre, Kangra, IN
3 Hill Agricultural Research and Extension Centre, Bajaura (Kullu), IN

Abstract

Turcicum leaf blight (TLB) and Maydis leaf blight (MLB) are amongst the important diseases of maize grown in the North-Western Himalayas. The experimental material was evaluated at two environments (natural E₁ & inoculated E₁) representing different agroclimatic and ecological conditions of North-Western Himalayas (SAREC, Kangra E₁ and HAREC, Bajaura E₁) to identify new resistance sources and to establish durability of known resistance sources of 8 parental genotypes, their 28 crosses and four checks viz., Palam Sankar Makka-2, Vivek Hybrid-45, Bio-9544 and DKC 7074 and were evaluated in RBD during Kharif, 2019 under natural conditions in E , whereas, under both natural as well as artificial epiphytotic conditions in E₁. The present study indicated the identification of 3 parental lines viz., P₃, P₆, P₄ cross combinations viz., P₃ × P₄, P₃ × P₅, P₃ × P₆, P₇ × P₈ and checks viz., Palam Sankar Makka-2, Vivek Hybrid-45 and DKC 7074 exhibiting resistant reaction against TLB in both environments under natural conditions and under artificial condition in E₁, whereas, against MLB under both natural as well as artificial epiphytotic condition in E₁. The new sources of resistance in the present study will be helpful for their deployment in the breeding programmes. The identified lines against TLB and MLB would serve as valuable sources of resistance and can be utilized in resistance breeding programmes. The cross combinations can be further evaluated for yield and other characters and can be released as promising hybrid varieties resistant to TLB and MLB.

Keywords

Maize, TLB, MLB, Natural Conditions, Artificial Conditions.

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Sawan Kumar ¹, V.K. Sood ¹, Sanjay Kumar Sanadya ¹, Gaurav Sharma ¹, Ritesh Kaushal ¹

Affiliations
1 Department of Genetics and Plant Breeding, College of Agriculture CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur-176 062, IN

Abstract

Present investigation was carried out during Rabi, 2018-19 to estimate cause and effect relationship among seed and fodder yield traits in eight accessions of Avena species including seven wild viz., A. barbata (HFO-58), A. orientalis (HFO-103), A. byzantina (HFO-498) and A. strigosa (HFO-505), A. byzantina (HFO-60), A. sterilis (HFO-508), A. sterilis (HFO-878) and one cultivated namely A. sativa (HJ-8). The accessions were evaluated in a randomized block design with three replications. Analysis of variance revealed significant differences among the accessions for all the traits studied. High heritability associated with high genetic advance was recorded for most of the traits suggesting the role of additive gene action. Number of tillers per plant, dry matter yield per plant, biological yield per plant, harvest index, seed length and protein content (%) showed significant association with seed yield per plant. Days to 50% flowering, leaf area, plant height, green fodder yield per plant, biological yield per plant, harvest index, seed length and 1000 gain weight had substantial direct effects on seed yield per plant. On the basis of overall performance, HFO-498 (A. longiglumis), HFO-505 (A. strigosa) and HFO-878 (A. sterilis) accessions of wild species were found to be superior over the cultivated A. sativa. Thereby, suggesting that these accessions can be utilized in oat improvement programme in near future.

Keywords

correlation, oat, Avena, path analysis, variability

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