Investigating variation among poplar (Populus deltoides) clones under nursery and field conditions for growth and physiological traits
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation entitled, “Investigating variation among poplar (Populus deltoides) clones under nursery and field conditions for growth and physiological traits” was conducted at experimental area of the Department of Forestry & Natural Resources, PAU, Ludhiana during the year 2015 and 2016. Sixteen poplar clones were evaluated under both nursery and field conditions for various growth traits, leaf traits, and physiological traits. Significant variation was observed among the clones for all the parameter except photosynthesis. Clones L-48/89, L-200/86, G-48 for collar diameter and L-200/86, G-48 and L-47/88 for plant height were promising at nursery stage. Clone T-98, 63-N, T-98 and L-200/86 recorded the highest values for leaf length, petiole length, leaf width and leaf area, respectively. The maximum number of roots and root length were recorded in clone 6503 and maximum number of leaves was recorded in clone T-21. Clone 6503 and L-200/86 were superior for dry root and shoot biomass. On basis of physiological traits, clone 9607 had top rank for stomatal conductance and 63-N was at the bottom. The maximum transpiration rate was recorded in clone T-21, 9607, 5503and L-48/89. At field stage, clone L-48/89 recorded the highest value for height and diameter at the age of 4 month. The DBH at age 13 months ranged from 47.46 mm to 81.12 mm. Clone L-200/86 and L-48/89 were promising for plant DBH. The maximum number of branches was recorded in clone L-200/86 (9.40) and the minimum value was recorded by clone T-33 (4.25). The tallest plants at age 13 months were of clone L-200/86 (8.06 m). In second experiment cuttings of clone L-47/88 were treated with gamma rays at dozes of 10 Gy, 20 Gy, 30 Gy, 40 Gy, 50 Gy for 0, 3.32, 7.05, 10.38, 14.11 and 17.43 min, respectively before planting in the nursery. Significant differences among treatments were observed for mean daily sprouting, peak value, sprouting value and survival percent. The T6 (control) recorded the highest values for all parameters. Percent reduction of sprouting and survival over control was maximum at 50 Gy of gamma radiation dose (40.4 and 100.0) and the lowest reduction was at 10 Gy (2.1 and 3.9). Again the maximum values for leaf area (176.7 cm2), leaf length (15.99 cm) and leaf width (16.19 cm) was recorded in case of T6 (control). Whereas, chlorophyll index shows non-significant variation among all the treatment. The maximum values for plant height and diameter were observed in T6 (control).
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