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We studied effects of dehydration and rehydration on germination of seeds of six mature tropical rain forest species— Cupania glabra  Swartz,  Cymbopetalum baillonii  Fries,  Poulsenia armata  (Miq.) Standl.,  Stemmadenia donnell-smithii  (Rose) Woodson,  Rheedia edulis  Triana &amp; Planch. and an understory palm  Chamaedorea alternans  H. Wendl.—from Veracruz, México. Before the seeds were sown, their water content was reduced by 0 (control), 30, 54 and 72% of their original water content. Dehydration affects the ability of seeds to rehydrate, as well as the rate and final percentage of germination when seeds are subsequently rehydrated. Seed survival and germination behavior showed three patterns: (1)  C. baillonii ,  P. armata  and  S. donnell-smithii  had greater tolerance to seed dehydration than  C. glabra ,  C. alternans  and  R. edulis ; (2) partial dehydration enhanced germinability of  C. glabra  and  C. baillonii  seeds; and (3) partial dehydration of  C. alternans  and  R. edulis  seeds resulted in delayed or sporadic germination. A relationship was found between the effects of dehydration on germination and the seasonality of seed production.

Seed germination of six mature neotropical rain forest species in response to dehydration