Metaxenia is commonly observed in which fruit plant

Metaxenia is commonly observed in the Date fruit plant.
Metaxenia is caused by the direct action of pollen on the character of the fruit which consists of the ovarian tissues of the mother plant.
SWINGLE and NIXON discovered this phenomenon in fruits of the date palm and the former named it “metaxenia”.
Each male exerts approximately the same effect on the fruit of all varieties and exerts the same effect in different years. This direct effect of the pollen on the parts of the seed and fruit lying outside the embryo and endosperm.