EFFECTS OF GA₃, BA AND NAA ON DRY MATTER PARTITIONING AND RHIZOME DEVELOPMENT IN TWO CULTIVARS OF ACHIMENES LONGIFLORA DC, UNDER THREE LEVELS OF IRRADIANCE.

Two cultivars of Achimenes longiflora DC., ‘Flamenco’ and ‘Hilda’ were placed at 21°C and 16 h light of 3 irradiance levels 35, 18 and 10 W m^-2 for 16 weeks after being sprayed with gibberelic acid (GA₃), benzyladenine (BA) or a-naphthalenacetic acid (NAA), alone and in combination.

Increasing irradiance levels increased dry weight of aerial parts and number and dry weight of rhizomes.
GA₃ increased plant height; the elongation effect was more prominent at lower irradiances.
The combination of GA₃ with BA or/and NAA increased weight of aerial parts and lowered the percentage of dry matter incorporated in the rhizomes (RWR). BA combined with NAA increased dry weight and number of rhizomes; however responses to growth regulator treatments depended on the cultivar; ‘Flamenco’ was more responsive than ‘Hilda’.

III International Symposium on Growth Regulators in Ornamental Horticulture

J.C. Vlahos

https://doi.org/10.17660/ActaHortic.1989.251.12