Benzyladenine-lnduced Shoot Formation in Indian Hawthorn (Rhaphiolepis indica)

摘要

In an outdoor nursery experiment conducted in summer 2001, benzyladenine (BA) was applied at concentrations up to 5000 ppm in 1250 ppm increments to plants (Rhaphiolepis indica) in 3.8-L (#1) and 26.5-L (#7) containers. By 30 days after last treatment(DALT) plants in 3.8-L (#1) containers treated with three weekly applications of 1250 ppm BA formed 169% more new shoots than controls and up to 331% more with 5000 ppm BA. Controls in 26.5-L (#7) containers formed 4.7 new shoots, and increased from 83to 126 new shoots with two weekly applications of 1250 and 5000 ppm. Plants in 26.5-L (#7) containers were retreated in September, at which time shoots were inactive. By 30 DALT controls formed less than one new shoot per plant, while plants averaged 18new shoots when treated with 1250 ppm BA and 105 new shoots when treated with 5000 ppm BA. In an outdoor experiment conducted in Spring 2002 new shoot formation increased up to 374% at 30 DALT after three BA applications. Injury rating increased with increasing BA rates at 30 DALT. By 90 DALT new shoots had matured normally and exhibited minimal phytotoxic symptoms.