Factors Affecting Shedding of Flowers in Soybean (Glycine max(L.) Merrill)

Effects of Source/Sink Ratio and Cytokinin Application on Pod Set in Soybean

“…Previous studies suggested that cytokinin acts to redirect movement of photoassimilate into sinks, increase sink strength and subsequently enhance growth rates of the fl owers and pods (Huff and Dybing, 1980;Dybing, 1994;Reese et al, 1995). In the present study, cytokinin application increased the photosynthetic rate and pod number, but not the starch content of leaves (Fig.…”

“…By reducing this abortion, we might be able to increase pod and seed numbers, thereby increasing the yield (Kokubun, 2004). Many previous studies have focused on two possible factors that might be involved in regulating the abortion; availability of photoassimilate or nutrients (Brevedan et al, 1978;Antos and Wiebold, 1984;Brun and Betts, 1984;Heitholt, 1986aHeitholt, , 1986b and quantity of certain hormones (Huff and Dybing, 1980;Heindl et al, 1982;Spollen et al, 1986aSpollen et al, , 1986bCarlson et al, 1987;Yarrow et al, 1988;Kokubun and Honda, 2000).…”

“…Huff and Dybing (1980) applied extracts from fl owers and young pods to growing fl owers, and found that the extract from young pods accelerated the abortion of fl owers. Then they applied a lanolin paste containing either indoleacetic acid (IAA), gibberellin (GA) or 6-benzylaminopurine (BA) to the raceme, and found that IAA accelerated the abortion like the extract, while GA and BA did not.…”

Source/Sink Relations of Abscising and Nonabscising Soybean Flowers

“…Some studies have implied that reproductive abscission in legumes is hormonally mediated (6,8,12,14), while others have implied that it is related to> the availability of photosynthetic assimilates (4, 10, 11). However, since reproductive abscission occurs at a time when plant photosynthetic rate is relatively high and reproductive growth rate is relatively low, it appears not to be limited by the contemporary supply of photoassimilate.…”

The Effects of Figaron and Water Deficit on Seed Yield of Two Soybean Cultivars

“…There have been conflicting reports regarding the effects of auxin on flower abscission in soybean. Huff and Dybing (1980) reported that IAA at a concentration of 1 % showed a promotive effect on flower abscission. Other reports have indicated that IAA reduced flower abscission and ethylene induced reproductive abscission in soybean (Urwiler and Stutte, 1986;Oberholster et al, 1991).…”