Variability and correlation studies in poplar (Populus deltoides Bartr. Ex Marsh) clones for growth and quality traits
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
The present study entitled “Variability and correlation studies in poplar (Populus deltoides
Bartr. Ex Marsh) clones for growth and quality traits” was conducted at main experimental
area of the Department of Forestry and Natural Resources, Punjab Agricultural University,
Ludhiana during the years 2019-2020. Sixteen poplar clones (14 clones introduced from YS
Parmar University of Horticulture and Forestry, Nauni, Solan and 2 from PAU) were
evaluated at nursery and field stage for growth and quality traits in randomized complete
block design. Significant differences were found among the clones for all traits except wood
specific gravity. Under nursery condition, the data were taken at three different ages (3, 7 and
11 months). Clones T-46, L-200/86 and 6503 exhibited highest collar diameter and height and
were statistically at par with both check clones. Clones L-200/86 and T-98 recorded the
maximum inter-nodal length and was superior than both the check clones at three different
ages. The maximum root and shoot length were recorded in clone T-50 and maximum number
of roots was found in clone T-46. Clone T-50 and T-33 were promising for dry root and shoot
biomass. Highly significant and positive correlation was found for height with collar diameter
and inter-nodal length at nursery stage. At field condition, clones check L-48/89, check L47/88,
9607 and 6503 were promising for all growth traits at three different ages (4, 4.5 and 5
years). The number of branches per meter crown length was significantly higher under clone
T-98 which was superior than both the check clones. Clones check L-48/89, check L-47/88,
9607 and T-50 showed moderately resistant reaction to leaf spot under field condition.
However, lower incidence of defoliators was obtained in clone T-50. The genotypic
coefficient variation and phenotypic coefficient variation ranged from 11.47-38.60 % and
14.78-47.51 %, respectively. High heritability was recorded in number of branches per meter
crown length (0.76 %) followed by DBH (0.73 %). The index score for morphological traits
(DBH, plant height, volume index, number of branches, defoliator incidence, indarbela
incidence and leaf spot incidence) was maximum clones in 9607 and check L-47/88. The
clones were clustered into five distinct groups with maximum diversity of (17.659) between
cluster II and cluster IV.
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Citation
Lakhwinder Singh (2021). Variability and correlation studies in poplar (Populus deltoides Bartr. Ex Marsh) clones for growth and quality traits (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.