Characterization of Vegetative Growth of Dwarf Soybean Genotypes Including a Gibberellin-Insensitive Genotype with Impaired Cell Division

Birnberg, Paul R.; Cordero, Robert E.; Brenner, Mark L.

doi:10.2307/2443867

Cited by 2 publications

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“…Gibberellin A3 could have exerted its effect directly on the flowers and pods or indirectly by promoting excess vegetative growth, reducing the amount of assimilates available for reproductive growth . As expected, the upper stems of both Evans and Lincoln were considerably elongated by GA 3 treatment (about 30% ; [5] and data not shown) . The GA3-treated plants also had longer racemes at the experimental node than non-GA 3 treated plants (data not shown), so some GA 3 apparently reached the reproductive structures .…”

Section: Discussionsupporting

confidence: 80%

“…T210, a single-gene mutant of the agronomic genotype Lincoln [9], attains only half the stature of Lincoln and has smaller leaves . It is incapable of responding to GA treatment with extra stem-or leaf-cell division, so that unlike Lincoln or Evans only a slight, cellelongation-based shoot-growth response to GA 3 is obtained [5] .…”

Section: Resultsmentioning

confidence: 99%

“…The experiment with T210 was designed to help distinguish between the direct and indirect modes of action . Gibberellin A 3 induced little vegetative growth in the single-gene mutant T210 [5], and had no effect on pod set (Table 3). This is consistent with the hypothesis that in the normal genotypes, GA 3 acted indirectly to decrease pod set by diverting photoassimilates away from developing pods toward vegetative tissue ; in T210, there was little extra vegetative tissue to demand extra resources, and no change in pod set.…”

Section: Discussionmentioning

confidence: 99%

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Effect of gibberellic acid on pod set in soybean

Birnberg

Brenner

1987

Plant Growth Regul

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Field-grown soybean plants (Glycine max (L .) Merr. cv. Evans) were treated with gibberellic acid (GA 3 ; 10g1-') and/or (2-chloroethyl)-trimethylammonium chloride (CCC ; 0 .8g1-')in 1983 and 1984, and subsequent anthesis, pod set, seed size, seed number, and seed yield were determined at one node . The treatments were applied to five leaves in the center of each plant (typically leaves 7-11) and reproductive development at the node in the center of those leaves was monitored . Gibberellin A3 applied "Early" (about 3 d before anthesis of the first flower at the monitored node) had no effect on the number of flowers produced, but decreased the fraction of flowers that set pods in both experimental years (by 32% in 1983 and 76% in 1984) . Seed size was slightly decreased by the GA 3 treatment in 1983 but not in 1984 . The "Middle" GA3 treatment (applied about 3 days after the "Early" treatment) slightly decreased the number of pods set; and "Late" treatments (9 days after) had no effect . None of the monitored parameters were affected by CCC .The "Early" experiments were repeated with two additional genotypes, Lincoln and T210 . Genotype T210 is a single-gene, dwarf mutant of Lincoln whose stem elongation and leaf expansion are insensitive to GA, Gibberellin A 3 affected the reproductive parameters in Lincoln very similarly to Evans but those in T210 were unaffected . This indicates that GA 3 exerts its effect by increasing the mass of vegetative tissue and thus diverting assimilates away from the pods . However, since the mutation in T210 might affect a receptor that is in flowers as well as shoots, it is possible that GA 3 exerted its effect on the normal genotypes directly on the developing pods, rather than indirectly by diverting photoassimilates .

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Section: Discussionsupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Effect of gibberellic acid on pod set in soybean

Birnberg

Brenner

1987

Plant Growth Regul

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“…Birnberg et al (1987) reported that when leaves of soybean cultivars Evans and Lincoln were treated with gibberellic acid (GA 3 ) about 3 days before anthesis, the fraction of flowers on the associated node that set pods was reduced by 28 to 76%.…”

Section: Number Of Pods Per Plantmentioning

confidence: 99%

A review on induced mutagenesis in soybean

Hm¹

2013

J. Cereals Oilseeds

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The history of mutations with early results in soybean has been well documented in the literature available. Mutation breeding has been used in recent years as a valuable supplement to other methods of plant breeding in generating new variability and development of crop varieties with new architecture, superior biochemical constitution and suitable growth and developmental rhythms. The utility of this method is evident from the fact that in several crops induced mutants have been released as new varieties. In this paper, efforts have been made to review the literature on induced mutations in soybean. The different mutagenic agents used for inducing mutations, effects of different mutagenic agents on yield, quality contributing characters and resistance to different diseases have been described.

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Characterization of Vegetative Growth of Dwarf Soybean Genotypes Including a Gibberellin-Insensitive Genotype with Impaired Cell Division

Cited by 2 publications

References 0 publications

Effect of gibberellic acid on pod set in soybean

Effect of gibberellic acid on pod set in soybean

A review on induced mutagenesis in soybean

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