To lower seed yield loss from directly harvested common bean or dry bean,
height of the lower pod-bearing nodes needs to be raised. The objective of this greenhouse
study was to stimulate lower stem elongation by gibberellic acid (GA3) of dry bean
cultivars. Seeds of cv. Matterhorn, erect indeterminate Type II, and cv. Poncho, prostate
indeterminate Type III, were dipped in GA3 at 62.5 to 16,000 ppmand planted. After 14 d,
the height of the unifoliate and first trifoliate nodes showed maximum stimulation of
stem elongation by 1000 ppm GA3 for ‘Poncho’ and by 2000 ppm for ‘Matterhorn’.
Application of 1 mL of GA3 at 0.031 to 2048 ppm to newly expanded unifoliate leaves
showed cultivar differences. Whereas ‘Matterhorn’ was promoted at 64 ppm and
reached a maximum height by 512 ppm GA3, ‘Poncho’ was promoted at 0.25 ppm and
reached a maximum height by 8 ppm GA3. Flowering of ‘Matterhorn’ was unaffected by
GA3; flowering of ‘Poncho’ was completely inhibited by 128 ppm. The sensitivity difference
of cultivars was verified with other cultivars. Type I cultivars, which are all
determinate, showed a full range ofGA3 sensitivity. Dry bean cultivars may be regrouped
based on the GA3 dose to which they respond. Individual response to GA3 rates of dry
bean cultivars needs to be predetermined using a short-term, 2–3 weeks, greenhouse
bioassay before field use of GA3.
To lower seed yield loss from directly harvested common bean or dry bean,height of the lower pod-bearing nodes needs to be raised. The objective of this greenhousestudy was to stimulate lower stem elongation by gibberellic acid (GA3) of dry beancultivars. Seeds of cv. Matterhorn, erect indeterminate Type II, and cv. Poncho, prostateindeterminate Type III, were dipped in GA3 at 62.5 to 16,000 ppmand planted. After 14 d,the height of the unifoliate and first trifoliate nodes showed maximum stimulation ofstem elongation by 1000 ppm GA3 for ‘Poncho’ and by 2000 ppm for ‘Matterhorn’.Application of 1 mL of GA3 at 0.031 to 2048 ppm to newly expanded unifoliate leavesshowed cultivar differences. Whereas ‘Matterhorn’ was promoted at 64 ppm andreached a maximum height by 512 ppm GA3, ‘Poncho’ was promoted at 0.25 ppm andreached a maximum height by 8 ppm GA3. Flowering of ‘Matterhorn’ was unaffected byGA3; flowering of ‘Poncho’ was completely inhibited by 128 ppm. The sensitivity differenceof cultivars was verified with other cultivars. Type I cultivars, which are alldeterminate, showed a full range ofGA3 sensitivity. Dry bean cultivars may be regroupedbased on the GA3 dose to which they respond. Individual response to GA3 rates of drybean cultivars needs to be predetermined using a short-term, 2–3 weeks, greenhousebioassay before field use of GA3.
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