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Variability in Urediniopustule and Urediniospore Size of Melampsora ciliata on Poplar Genotypes
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Variation in the dimensions of urediniopustules and urediniospores of Melampsora ciliata produced on different popular species/cultivars/clones/hybrids has been observed in the present investigations. Smallest urediniopustules were produced on P.deltoides 'Lux' (0.38 mm) while largest on P.yunnanensis (1.34 mm). In P.ciliata clones/hybrids, smallest urediniopustules were recorded in 53M1 (0.16 mm) while largest in Chhatrari (0.90 mm). Largest spore size (33.6 × 16.3 μm) was recorded on P.deltoides 'Lux' and 64M1 (36.3 × 17.3 μm) while smallest on P. xeuramericana 'Robusta AE' and 53M1. Irrespective of species/cultivars, urediniospore size ranged from 13.1-39.3 × 13.1- 19.6 μm. The average urediniospore size of M.ciliata produced on P.ciliata clones ranged from 30.8 -36.3 × 15.4 - 17.1 μm while that on hybrids from 27.2 - 36.3 × 14.5 - 20.0 μm.
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