GENETIC STUDIES FOR YIELD TRAITS AND POWDERY MILDEW RESISTANCE IN DUAL PURPOSE OAT (AVENA SATIVA L..) GERMPLASM.
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Date
2019-07
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CSKHPKV, Palampur
Abstract
The present investigation entitled “Genetic studies for yield traits and powdery mildew resistance in
dual purpose oat (Avena sativa L.) germplasm” was undertaken to understand the nature of variation
and associations among different agro-morphological and quality traits with yield and to identify
powdery mildew resistant dual purpose oat genotypes. The experimental material consisting of 55
genotypes along with 3 checks of oat were raised in Randomized Block Design with three replications
during Rabi 2018-2019 and data were recorded separately for dual purpose traits and sole seed yield
related traits Genetic diversity among different genotypes was studied on the basiis of morphological
traits using Mahalanobis D2-statistic and PCA. Screening of genotypes for powdery mildew resistance
was done under in vivo and in vitro conditions and further, confirmed through molecular markers
tightly linked to pm resistant gene.
Mean values for different traits revealed that seven genotypes viz., OATS-80, HJ-8, KRRAK-
26, JPO-28, JPO-38, IG-03-205 and EC-528883 were found superior for green fodder yield per
plant as well as seed yield per plant i.e. for dual purpose; out of which, JPO-28, JPO-38, IG-03-205,
EC-528883 and HJ-8 also found superior for β-glucan, ADF and NDF content, while, genotypes JPO-
28, JPO-38, IG-03-205 and KRR-AK-26 were found resistant to powdery mildew.
PCV along with GCV were high for tillers per plant, dry matter yield per plant, crude protein
yield per plant and biological yield per plant, whereas, for β-glucan content, moderate PCV with low
GCV was observed ,while, for regeneration percent low PCV with low GCV was observed. High
heritability along with high genetic advance was observed for tillers per plant, dry matter yield per
plant and crude protein yield per plant. Path coefficient analysis revealed the high direct effect of dry
matter yield per plant, dry matter percent, days to 50 % flowering and tillers per plant for fresh fodder
yield; whereas, for seed yield high direct effect of days to 75% maturity, tillers per plant, biological
yield per plant and harvest index was observed. Therefore, these would be the best selection indices to
select high yielding dual purpose genotypes. Based on D2-statistic, genotypes were grouped into 12
clusters in case of dual purpose traits whereas in case of seed yield related traits genotypes were
grouped into 11 clusters. Three genotypes viz., IG-03-205, EC-528883 and OS-6 were found to be
diverse for both dual purpose as well as seed yield related traits and can be utilized in future
hybridization programmes. Eight genotypes viz., JPO-28, OS-6, PLP-1, JPO-46, JPO-36, KRR-AK-26,
JPO-38, and IG-03-205 were found resistant to powdery mildew under in vivo as well as under in vitro
conditions and confirmed through molecular marker AM-102 that is tightly linked tto pm resistant gene
Eg-5.
Overall, on the basis of mean values, genotypes namely, EC-528883, JPO-28, JPO-38, HJ-8
and IG-03-205 were found superior for dual purpose (fodder yield as well as seed yield), β-glucan
content and contained a lower concentration of ADF and NDF content. Out of these, JPO-28, JPO-38,
and IG-03-205 were found resistant to powdery mildew. So, these genotypes can be further tested over
years and locations.
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