adjectiveBotany & Zoology
(Of a hermaphrodite flower or animal) having the male reproductive organs come to maturity before the female. The opposite of protogynous.
- It is a wind-pollinated species, with hermaphroditic protandrous flowers (the first two days as male and three last days as female).
- In many protandrous spiders, adult males cohabit with juvenile females nearing sexual maturity, and this may provide an index of expected mate availability for females.
- Perfect flowers are protandrous, hence the stigmas open after anthesis, which reduces the probability of autogamous self-pollination.
- Example sentences
- Under natural photoperiodic conditions protandry in hermaphrodite disc flowers of sunflower is determined by the different elongation rates of the style and filaments.
- The temporal aspects of stigma receptivity and pollen longevity were investigated in relation to protandry (the occurrence of anther dehiscence prior to stigma receptivity) and breeding system.
- Predictions from the above hypotheses are not mutually exclusive, and associations between protandry and sexual dimorphism may be promoted by complex interactions between the suggested mechanisms acting in concert.
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