Effect of collection date on capsule moisture content and germination of Populus ciliata Wall. ex Royle from central Himalaya
2002
Pandit, A. | Pant, K. | Ram, J.
Seed maturity indices of Populus ciliata were investigated in collections from Sukhatal and Bhowali. Across both seed sources, mean capsule size varied from 68.0 +/- 1.5 mm(2) to 72.0 +/- 0.9 mm(2), while mean number of capsules/100 grams varied from 268 +/- 8 to 295 +/- 12. Mean weight of 100 capsules varied from 25.0 +/- 1.4 g to 27.0 +/- 1.4 g. Weight of 100 capsules among sources and individual trees differed significantly (P < 0.05), while number of capsules/100 grams and weight of 100 capsules was negatively correlated (r(2) = 0.69). As capsules matured moisture content decreased from 83.2 +/- 1.1% to 54.3 +/- 0.3% at Sukhatal and from 77.7 +/- 0.4% to 46.4 +/- 0.3% at Bhowali. The optimum germination was at 58-60% moisture content. Maturation was related to capsule colour changes as well as moisture content. These parameters were judged to be good indicators of when to collect P. ciliata seeds.
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