protandrous


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Related to protandrous: protogynous

protandrous

(prō-tăn′drəs)
adj.
Of or relating to an organism, especially a plant, in which the male reproductive organs mature before the female reproductive organs.

pro·tan′dry (-drē) n.

protandrous

  1. (of male gametes) ripening before the female gametes. Compare PROTOGYNOUS.
  2. (of plant flowers) possessing ANTHERS which ripen before the stigma is able to receive the pollen, thereby preventing SELF POLLINATION.
References in periodicals archive ?
secretion in protandrous Alstroemeria aurea (Alstroemeriaceae): is
They found 2 genotypes for males--true males (MF), protandric males (FF)--and 1 single genotype for females (FF), assuming that the allele M is a dominant male allele and allele F is a recessive protandrous allele.
We based our determination that common snook are protandrous hermaphrodites on the following criteria presented by Sadovy and Shapiro (1987): 1) sex ratios shifted from exclusively male to predominantly female with increasing size and age, 2) transitional-sex-stage individuals were observed whose gonads contained both degenerating spermatogenic and developing ovarian tissue, and 3) sex change was documented in captive fish.
Many species are protandrous or protogynous and some are dioecious (notably Chamaedorea spp.
triphyllum, as it contains some "constant" males and "constant" females as well as an array of sexually labile forms that cluster essentially protandrous and protogynous patterns.
Olympia oysters are larviparous, protandrous, alternating hermaphrodites.
1988)] rather than protandrous (Digitalis purpurea, Digitaleae) (Darwin, 1877; Best & Bierzychudek, 1982).
Oysters are protandrous hermaphrodites that become female after reaching larger sizes (Thompson et al.
Oysters are often considered as a prime example of protandrous hermaphrodites, and the ratio of males to female's changes profoundly with age (Guo et al.