Histological Observations on Abscising and Retained Soybean Flowers

Abernethy, Rollin H.; Palmer, R. C.; Shibles, Richard; Anderson, I. C.

doi:10.4141/cjps77-104

Cited by 47 publications

(25 citation statements)

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“…During this period, a fertilized ovule develops embryo and endosperm, and cells are dividing actively (Carlson and Lersten, 1987). Microscopic observations showed that most of the abscised flowers were at the proembryo stage, which is several days after anthesis (Kato, 1964;Abernethy et al, 1977). Abernethy et al (1977) speculated that the frequent occurrence of abscission at this stage was due to the reduced level of a cell division mediating factor.…”

Section: Discussionmentioning

confidence: 99%

“…Microscopic observations showed that most of the abscised flowers were at the proembryo stage, which is several days after anthesis (Kato, 1964;Abernethy et al, 1977). Abernethy et al (1977) speculated that the frequent occurrence of abscission at this stage was due to the reduced level of a cell division mediating factor. Although the exact mode of cytokinin action remains unclear (McGaw and Burch, 1995), our results showing that enhanced pod-set probability was accompanied by increased levels of endogenous cytokinins, and the observation by other workers that the enhanced pod set resulted from exogenous cytokinin application (Crosby et al, 1981 ;Dyer et al, 1987 ;Peterson et al, 1990 ;Mosjidis et al, 1993 ;Reese et al, 1995) strongly suggest that cytokinins play a promotive role in differentiation and/ or early development of embryos.…”

Section: Discussionmentioning

confidence: 99%

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Intra-Raceme Variation in Pod-Set Probability Is Associated with Cytokinin Content in Soybeans

Kokubun

Honda

2000

Plant Production Science

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Intra-Raceme Variation in Pod-Set Probability Is Associated with Cytokinin Content in Soybeans

Kokubun

Honda

2000

Plant Production Science

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“…Soybean plants differentiate abundant floral buds, but a large proportion of them abort during development (Kato, 1964;Abernethy et al, 1977): under normal conditions, pod set percentage is only 20 to 40% (Wiebold et al, 1981;Antos and Wiebold, 1984;Jiang and Egli, 1993). By reducing this abortion, it might be possible to increase the pod number, thereby increasing the yield (Kokubun, 2004).…”

mentioning

confidence: 99%

Roles of Auxin and Cytokinin in Soybean Pod Setting

Nonokawa

Kokubun

Nakajima

et al. 2007

Plant Production Science

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: Soybean plants differentiate abundant floral buds, but most of them fail to grow pods and abort during development. Many studies indicated promotive effects of exogenously applied cytokinin on pod setting, but the effects of auxin application on pod set are ambiguous. In this study, we examined the changes in the concentrations of endogenous auxin and cytokinin in racemes and the effects of application of the two hormones on pod setting to clarify the role of auxin and cytokinin in soybean pod setting. The longraceme soybean genotype IX93-100 was grown in pots and in the field. The auxin (IAA, indoleacetic acid) concentration in racemes was high for a long period from pre-anthesis to 9 days after anthesis (DAA) of the first flower on a raceme, but the cytokinin concentration was high for a short period, with a peak at 9 DAA. The IAA concentration was higher in distal portions of racemes, but the cytokinin concentration was higher in basal portions of racemes. In pot-grown plants, IAA applied to racemes tended to reduce the number of flowers and pods. In contrast, 6-benzylaminopurine (BA) applied to racemes before anthesis tended to reduce the number of flowers and pods, and that applied around 7 DAA significantly increased the pod-set percentage. However, these effects of IAA and BA application were slight in field-grown plants. These results indicate that the concentration of endogenous auxin and cytokinin in racemes changes in a different manner, and that cytokinins have a positive, and auxin a negative effect on pod setting when respective hormones are applied to racemes after the anthesis stage.

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“…A large proportion of fl owers abort during development in soybean (Kato, 1964;Abernethy et al, 1977). Under normal growing conditions, pod set percentage ranges from 20 to 40% (Wiebold et al, 1981;Jiang and Egli, 1993).…”

mentioning

confidence: 99%