BA-INDUCED OFFSET FORMATION IN HOSTA DEPENDENT ON CULTIVAR

in HortScience

A foliar spray of 0, 1250, 2500, or 3750 mg benzyladenine (BA)/liter was applied to 10 hosta cultivars. Response to BA treatment was cultivar dependent, with BA promoting offset formation in half of the cultivars tested. Increase in offsets compared to the control ranged from 116% in `Francee' to 3500% in `Francis Williams' at 30 days after treatment (DAT) and from 150% in `Royal Standard' to 2250% in `Francis Williams' at 60 DAT with 3750 mg BA/liter. Stage of development, as indicated by the number of unfurled leaves on offsets, was also cultivar and BA dependent. All cultivars treated with 3750 mg BA/liter had an average of three or more unfurled leaves at 60 DAT, while among control plants, 40% of cultivars averaged less than three unfurled leaves. No phytotoxic symptoms were noted in any cultivar, and growth index was either increased or not affected by BA treatment. Chemical name used: N-(phenylmethyl)-1H-purin-6-amine (benzyladenine, BA).

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