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The seeds of Opuntia ficus indica (L.) Mill. are rounded in outline with convex surfaces. The seed coat is hard and shiny. The seed
weight follows normal distribution i.e., few seeds had very low weight (< = 14 mg), few had larger weight (> or = 22.1mg) and most
of the seeds had weight ranging from 14.1 to 19.9 mg. Hardness and imperviousness of testa to water imposes dormancy. Germination
of seeds is slow and very low but enhanced on H2SO4 scarification. Majority of seedlings had two cotyledons but few of them (11 in
140 seedlings i.e., 7.86%) exhibited tricotyledony. In dicotyledonous seedlings major spurt in expansion of both large and small
cotyledons of the seedlings took place from 4 to 6 days after emergence – later the expansion curve became more or less asymptotic.
In case of tricotyledonous seedlings expansion of the large, medium and small cotyledons appeared to be somewhat slow but
continuous as observed during initial 15 days of growth. Tricotyledonous seedlings didn’t differ significantly from dicotyledonous
ones in radicle and hypocotyl growth but had somewhat larger cotyledonary area per seedling.
D. Khan. (2006) SOME SEED AND SEEDLING CHARACTERISTICS (TRICOTYLEDONY) OF OPUNTIA FICUS INDICA (L.) MILL. (CACTACEAE), , Volume 3, Issue 4.
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