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

Yashima, Yumi; Kaihatsu, Azusa; Nakajima, Takayuki; Kokubun, Makie

doi:10.1626/pps.8.139

Cited by 25 publications

(26 citation statements)

References 34 publications

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“…Alguns estudos têm mostrado uma forte tendência tecnológica para o uso de citocininas sintéticas, aplicadas via foliar, associadas ou não a nutrientes, como formas de manejo para aumentar a produtividade da soja (Crosby et al, 1981;Carlson et al, 1987;Dyer et al, 1987;Mosjidis et al, 1993;Nagel et al, 2001;Cho et al, 2002;Liu et al, 2004;Yashima et al, 2005;Nonokawa et al, 2007). Nessa leguminosa, um elevado número de flores e de legumes jovens é abortado naturalmente, o que representa um impacto negativo na produtividade (Nonokawa et al, 2007).…”

Section: Kinetin and Potassium Nitrate Effects On Agronomic Characterunclassified

“…Os principais fatores envolvidos na fixação de legumes de soja são a disponibilidade de nutrientes e de fotoassimilados destinados a esses legumes, quando em desenvolvimento (Wiebold, 1990), assim como a disponibilidade de algumas classes de hormônios nas sementes (Crosby et al, 1981;Carlson et al, 1987;Kokubun & Honda, 2000;Yashima et al, 2005). Pesquisas indicam a existência de deficiência de citocinina endógena, no terço superior do racemo em plantas de soja, que se encontra correlacionada ao maior aborto das partes reprodutivas da planta (Kokubun & Honda, 2000;Nonokawa et al, 2007).…”

Section: Kinetin and Potassium Nitrate Effects On Agronomic Characterunclassified

“…Esses aumentos são consistentes com dados da literatura, para a cultura da soja em condições de cultivo protegido e de campo (Crosby et al, 1981;Carlson et al, 1987;Dyer et al, 1987;Mosjidis et al, 1993;Nagel et al, 2001;Cho et al, 2002;Liu et al, 2004;Yashima et al, 2005;Nonokawa et al, 2007).…”

Section: Kinetin and Potassium Nitrate Effects On Agronomic Characterunclassified

“…Nesse sentido, a capacidade das citocininas em regular a relação de forças entre as fontes e drenos pode exercer importante papel para o aumento de produtividade da lavoura, por meio da fixação de legumes e aumento do acúmulo de matéria seca dos grãos, durante a fase R3 (Liu et al, 2004;Yashima et al, 2005;Nonokawa et al, 2007).…”

Section: Kinetin and Potassium Nitrate Effects On Agronomic Characterunclassified

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Cinetina e nitrato de potássio em características agronômicas de soja

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Carvalho

et al. 2008

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o efeito do fitorregulador cinetina e do nitrato de potássio, aplicados via foliar na fase fenológica R3, sobre algumas características agronômicas da soja e sua produtividade em campo. Utilizaram-se cinco doses de cinetina, combinadas com quatro doses de nitrato de potássio, em esquema bi-fatorial, em delineamento de blocos ao acaso. A aplicação de nitrato de potássio não influenciou as características agronômicas avaliadas. A cinetina aumentou em até 27,4% o número de legumes fixados. O peso de 1.000 sementes e a produtividade de grãos foram aumentados em até 2,7 e 32,3%, respectivamente.Termos para indexação: Glycine max, citocinina, fitorregulador, nutrição mineral. Kinetin and potassium nitrate effects on agronomic characteristics of soybeanAbstract -The aim of this work was to evaluate the effect of kinetin and of potassium nitrate, applied on leaves in the phenological phase R3, on some agronomic characteristics of soybean plants and their yield in field. Five concentrations of kinetin combined with four concentrations of potassium nitrate were used in an outline bi-factorial, in a randomized block experimental design, with three replications. The potassium nitrate application did not influence the studied agronomic characteristics. Kinetin increased the pod set number up to 27.4%, in contrast to the control. Kinetin increased the weight of 1,000 seeds and the yield up to 2.7 and 32.3%, respectively.

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Section: Kinetin and Potassium Nitrate Effects On Agronomic Characterunclassified

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Cinetina e nitrato de potássio em características agronômicas de soja

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Carvalho

et al. 2008

Pesq. agropec. bras.

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“…By reducing this abortion, it might be possible to increase the pod number, thereby increasing the yield (Kokubun, 2004). Numerous precedent studies showed two putative factors involved in controlling the abortion: availability of photosynthate or nutrients for pod development (Brevedan et al, 1978;Antos and Wiebold, 1984;Brun and Betts, 1984;Heitholt et al, 1986a, b) and availability of certain hormones (Huff and Dybing, 1980;Heindl et al, 1982;Spollen et al, 1986a, b;Carlson et al, 1987;Yarrow et al, 1988;Kokubun and Honda, 2000;Yashima et al, 2005). Within individual racemes, the pod set percentage of basal flowers is considerably higher than that of distal ones (Wiebold et al, 1981;Spollen et al, 1986a;Saitoh et al, 1999): this phenomenon appeared to be associated with the endogenous cytokinin content of flowers; the basal flowers contained a higher percentage of cytokinin than the distal flowers (Kokubun and Honda, 2000).…”

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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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Comparative transcriptomics reveals a reduction in carbon capture and flux between source and sink in cytokinin-treated inflorescences of Jatropha curcas L.

et al. 2018

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The low seed yield of has been a stumbling block in realizing its full potential as an ideal bioenergy crop. Low female to male flower ratio is considered as a major limiting factor responsible for low seed yield in Jatropha. An exogenous cytokinin application was performed on floral meristems to increase the seed yield. This resulted in an increase of total flowers count with a higher female to male flower ratio. However, the seed biomass did not increase in the same proportion. The possible reason for this was hypothesized to be the lack of increased photosynthesis efficiency at source tissues which could fulfil the increased demand of photosynthates and primary metabolites in maturing seeds. After cytokinin application, possible molecular mechanisms underlying carbon capture and flux affected between the source and sink in developing flowers, fruits and seeds were investigated. Comparative transcriptome analysis was performed on inflorescence meristems (treated with cytokinin) and control (untreated inflorescence meristems) at time intervals of 15 and 30 days, respectively. KEGG-based functional annotation identified various metabolic pathways associated with carbon capture and flux. Pathways such as photosynthesis, carbon fixation, carbohydrate metabolism and nitrogen metabolism were upregulated after 15 days of cytokinin treatment; however, those were downregulated after 30 days. Five genes, ,, and showed significant increase in transcript abundance after 15 days of treatment but showed a significant decrease after 30 days. These genes, after functional validation, can be suitable targets in designing a suitable genetic intervention strategy to increase overall seed yield in Jatropha.

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

Cited by 25 publications

References 34 publications

Cinetina e nitrato de potássio em características agronômicas de soja

Cinetina e nitrato de potássio em características agronômicas de soja

Roles of Auxin and Cytokinin in Soybean Pod Setting

Comparative transcriptomics reveals a reduction in carbon capture and flux between source and sink in cytokinin-treated inflorescences of Jatropha curcas L.

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