Title: INHERITANCE IN TRI PLOID HYBRIDS OF ROSA
Author: LATA P
Author Address: 23 SALISBURY RD., LONDON E7, UK.
Published in: Environmental and Experimental Botany, volumn 23, pages 85-92, (1983).
Abstract: “Inheritance in triploid hybrids of Rosa.Crosses between a diploid, Rosa rugosa typica and a tetraploid, R. spinosissima pimpinellifolia resulted in 20 triploid seedlings. The characters of these hybrid plants with regard to the habit of growth, stem armature and foliage closely resembled those of R. s. pimpinellifolia while certain other features were intermediate in nature. The hybrids produced soft pink flowers, unlike their parents which had carmine-red and yellow-flowers, respectively. Fruit set was abundant in parents and absent in the hybrids; moderate flowering was observed during every flowering season. Detailed scanning electron microscopic studies of the pollen grains of the triploid hybrids revealed that the malformed and mainly shrunken pollen grains of hybrids also had a poorly developed exine pattern relative to that of the parents. A comparison of the cytological characters was also made between the above mentioned diploid and triploid plants and 3 ancient Rugosa roses. The latter group consisted of diploids and a triploid which have been cultivated for more than 55 yr.”