A Novel Intersectional Buddleja Hybrid

Buddleja indica Lam. is encountered frequently as a houseplant or a conservatory specimen and is attractive ornamentally for its oak-shaped foliage. Buddleja indica, a tetraploid African species, 2n = 76, was crossed to the Asiatic tetraploid species B. davidii Franch. The F1 generation was intermediate in foliage character between the two parents. Flowers of the F1 were either white or light lavender in color and the number of flowers per inflorescence was intermediate between the parents. The F1 plants were fertile. These hybrids might be suitable for greenhouse or container culture due to their attractive foliage and floral display.

INHERITANCE OF A TEMPERATURE-SENSITIVE YELLOW FOLIAGE CHARACTER IN RUSSIAN WILD RYEGRASS

Segregation in populations derived by crossing heterozygous plants of Russian wild ryegrass (Elymus junceus Fisch.) (breeding line Sc. 25317) showed that the temperature-sensitive yellow foliage character carried by this population is monogenic and recessive. The temperature-sensitive plants were yellow when grown at about 10 C, but a normal green color when grown at higher temperatures. The gene symbol ty1 has been proposed for this character.

INHERITANCE OF A YELLOW FOLIAGE CHARACTER IN RUSSIAN WILD RYEGRASS

Segregation in populations derived by crossing Sc. 260180, a yellow foliaged plant of Russian wild ryegrass (Elymus junceus Fisch.) and Sc. 25311, a normal green plant, showed the yellow foliage character carried by this population to be monogenic and recessive. The gene symbol y1 has been proposed for this character.

INHERITANCE OF A VARIEGATED FOLIAGE CHARACTER IN RUSSIAN WILD RYEGRASS, ELYMUS JUNCEUS FISCH.

Segregation in population derived by crossing heterozygous progeny of Sc.260181, a variegated plant of Russian wild ryegrass, and Sc.25311, a normal plant, showed a 12 normal green:3 variegated:1 albino ratio indicating inheritance according to the dominant epistasis pattern for two factors.