THE ROLES OF POLLEN ACC AND POLLEN TUBE GROWTH IN ETHYLENE PRODUCTION BY CARNATIONS
Examination of the events following pollination of standard carnations (Dianthus caryophyllus L. cv. White Sim) with pollen from miniature carnations (D. caryophyllus cvs Exquisite and Elegance) showed that increased ethylene production by the gynoecium almost immediately after pollination and before germination of the pollen grains was due to ACC present on the pollen. Sweet pea (Lathyrus odoratus) pollen applied to carnation flowers germinated but did not penetrate the stigmas, and caused a transitory increase in ethylene production by the carnation gynoecia. The subsequent increase in ethylene production during normal pollination was associated with growth of the pollen tubes down the stigmas. Although the pollen tubes had already reached the micropyle of the ovule within 12 h of pollination, senescence of excised petals from pollinated carnations occurred only in petals excised 24 or more hours after pollination. The roles of ACC in the pollen and growth of the pollen tubes in the senescence of pollinated carnations are discussed.
Whitehead, C. S., Fujino, David W. and Reid, M. S. (1983). THE ROLES OF POLLEN ACC AND POLLEN TUBE GROWTH IN ETHYLENE PRODUCTION BY CARNATIONS. Acta Hortic. 141, 221-228