Материал из Антэкология /// Anthecology
Flower Colour Changes in Lantana camara
Journal of Experimental Botany, 1984. V. 35. No. 11. P. 1656–1662 (7).
Lantana camara flowers undergo colour change subsequent to anthesis. In the colour variant selected for the present study, pink buds, yellow newly-opened flowers and ageing orange, scarlet and magenta flowers are found in the same inflorescence. The flower pigments were chemically analysed and identified as delphinidin monoglucoside and β-carotene. Thrips are regular pollinators of Lantana under Delhi conditions. Pollination was identified as the trigger for rapid anthocyanin synthesis. Even the presence of one pollen grain on the stigma of a yellow flower was sufficient to cause colour change. Injection of a suspension of pollen into flowers opened in vitro caused pigment changes. An extract of Lantana pollen was also able to simulate the effect of pollination, suggesting the involvement of a pollen factor. The post-pollination shift in petal colouration is caused by the masking of carotenoids by differential amounts of anthocyanin. As thrips are attracted to only yellow flowers, chromatic changes play a role in conserving pollinator energy.