Screening of Okra (Abelmoschus esculentus L. Moench) germplasm against Okra Yellow Vein Mosaic Virus disease under field condition
Loading...
Date
2016
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The present investigation entitled, “Screening of Okra (Abelmoschus esculentus
L. Moench) germplasm against Okra Yellow Vein Mosaic Virus disease under field
condition” was conducted at All India Co-ordinated Research Project on Vegetable
Crops of OUAT, Bhubaneswar, Odisha during summer season of 2015. The objective
was to study the genetic variability and screening of okra germplasm against Yellow Vein
Mosaic Virus (YVMV) disease under field conditions. The experiment was laid out with
10 okra germplasm by adopting Randomized Block Design replicated thrice in a plot size
of 3.0 m X 3.0 m with a spacing of 45 cm X 30 cm. Observations of 26 parameters on
vegetative growth, flowering, fruit yield and yield attributing, fruit quality traits and
incidence of YVMV at 30, 45, 60, 75 and 90 days after sowing (DAS) were recorded and
subjected to statistical analysis.
The results indicated significant variations for all the traits except ridges plant-1,
fruit girth and crop duration indicating the vast scope for selection. Among the
germplasm, 2012/OKYVRES-1was identified as resistant genotype against YVMV
(0.00%) followed by 2012/OKYVRES-2 (0.00 to 20.30%) at all the stages of crop growth
(30 to 90 DAS).
The genotype, 2012/OKYVRES-5 recorded significantly highest fruits plant-1
(20.75), fruit length (13.88cm), fruit weight(20.20g), fruit weight plant-1(141.59g), fruit
dry weight (10.80g) and fruit yield(11.50kg plot-1 and 141.98qha-1). The genotype also
produced fruits of moderate quality in terms of reducing, non-reducing and total sugar
(2.78, 0.55 and 3.33%, respectively) and crude protein content (8.75%). The genotypes
showed significant tolerance to YVMV up to 45 to 60 DAS, except 2012/OKYVRES-1
and 2012/OKYVRES-2. The next best genotype identified was 2012/OKYVRES-2 with
better growth, yield and yield attributes parameters along with resistance to YVMV (0.00
to 20.30%) under Bhubaneswar condition.
The genetical studies indicated that direct selection through traits like fruit weight
plant-1 fruit, yield (qha-1), incidence of YVMV at 45, 60, 75, 90 DAS will be effective for
improvement in okra especially to develop a genotype having resistance and/or tolerance
to YVMV. Being most divergent Cluster-II (2012/OKYVRES-5) and Cluster- IV
(2012/OKYVRES-2), hence expected hybridization might result in highly heterotic
hybrid and other segregants. Incidence of YVMV is contributing maximum towards
divergence suggested that special attention should given to this character while designing
crop improvement programme in okra.
Hence, it may be concluded that the genotype, 2012/OKYVRES-1 can be used as
source of resistance to YVMV in crop improvement programme. Both 2012/OKYVRES-
5 and 2012/OKYVRES-2 may be recommended for commercial cultivation with better
growth, yield and tolerance to YVMV under field conditions