Is ABA the earliest upstream inhibitor of apical dominance?

Nguyen, Thien Q.; Emery, R. J. Neil

doi:10.1093/jxb/erx028

Cited by 19 publications

(14 citation statements)

References 17 publications

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“…These results implied a correlation between SL‐mediated axillary bud dormancy and ABA and JA. As involvement of ABA in the control of seed dormancy is well established, as well as in bud dormancy (González‐Grandío and Cubas, ; Shu et al ., ; Nguyen and Emery, ), we further analyzed the effects of ABA in the control of SL‐mediated axillary bud dormancy in rice. Indeed, the gene most highly activated in the dormant buds was an ortholog of AWPM‐19 , which is an ABA‐responsive gene of unknown function isolated from Arabidopsis and was recently shown to be involved in seed dormancy of wheat (Barrero et al ., ; Chen et al ., ) (Figure a; Table S3).…”

Section: Resultsmentioning

confidence: 99%

“…Involvement of ABA in the control of seed dormancy is well established (Graeber et al ., ). An association between bud inhibition and an elevated level of ABA in the buds has also been suggested by many studies (Ruttink et al ., ; Zheng et al ., ; Nguyen and Emery, ). Recently, involvement of ABA in the control of axillary bud dormancy has been reported in Arabidopsis shade avoidance syndrome and PHYTOCHROME B regulated dormancy in sorghum (Reddy et al ., ; Kebrom and Mullet, ).…”

Section: Discussionmentioning

confidence: 99%

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Developmental analysis of the early steps in strigolactone‐mediated axillary bud dormancy in rice

et al. 2019

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SummaryBy contrast with rapid progress in understanding the mechanisms of biosynthesis and signaling of strigolactone (SL), mechanisms by which SL inhibits axillary bud outgrowth are less well understood. We established a rice (Oryza sativa L.) hydroponic culture system to observe axillary buds at the critical point when the buds enter the dormant state. In situ hybridization analysis indicated that cell division stops in the leaf primordia of the buds entering dormancy. We compared transcriptomes in the axillary buds isolated by laser capture microdissection before and after entering the dormant state and identified genes that are specifically upregulated or downregulated in dormant buds respectively, in SL‐mediated axillary bud dormancy. Typically, cell cycle genes and ribosomal genes are included among the active genes while abscisic acid (ABA)‐inducible genes are among the dormant genes. Application of ABA to the hydroponic culture suppressed the growth of axillary buds of SL mutants to the same level as wild‐type (WT) buds. Tiller number was decreased in the transgenic lines overexpressing OsNCED1, the gene that encodes ABA biosynthesis enzyme. These results indicated that the main site of SL function is the leaf primordia in the axillary bud and that ABA is involved in SL‐mediated axillary bud dormancy.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Developmental analysis of the early steps in strigolactone‐mediated axillary bud dormancy in rice

et al. 2019

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“…Recently, Yao and Finlayson proved that ABA restricts the outgrowth of lower buds and promotes correlated inhibition [49]. These findings raise the possibility that ABA is one of the first upstream factors regulating the apical dominance responses to the red:far red ratio [50]. As discussed below, the overexpression of PmDAM6 increased the days to bud break in forcing condition, implying that PmDAM6 enhanced the dormancy depth of terminal buds during the adult phase.…”

Section: Discussionmentioning

confidence: 97%

Overexpression of Prunus DAM6 inhibits growth, represses bud break competency of dormant buds and delays bud outgrowth in apple plants

et al. 2019

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Most deciduous fruit trees cultivated in the temperate zone require a genotype-dependent amounts of chilling exposure for dormancy release and bud break. In Japanese apricot (Prunus mume), DORMANCY-ASSOCIATED MADS-box 6 (PmDAM6) may influence chillingmediated dormancy release and bud break. In this study, we attempted to elucidate the biological functions of PmDAM6 related to dormancy regulation by analyzing PmDAM6-overexpressing transgenic apple (Malus spp.). We generated 35S:PmDAM6 lines and chemically inducible overexpression lines, 35S:PmDAM6-GR. In both overexpression lines, shoot growth was inhibited and early bud set was observed. In addition, PmDAM6 expression repressed bud break competency during dormancy and delayed bud break. Moreover, PmDAM6 expression increased abscisic acid levels and decreased cytokinins contents during the late dormancy and bud break stages in both 35S:PmDAM6 and 35S:PmDAM6-GR. Our analysis also suggested that abscisic acid levels increased during dormancy but subsequently decreased during dormancy release whereas cytokinins contents increased during the bud break stage in dormant Japanese apricot buds. We previously revealed that PmDAM6 expression is continuously down-regulated during dormancy release toward bud break in Japanese apricot. The PmDAM6 expression pattern was concurrent with a decrease and increase in the abscisic acid and cytokinins contents, respectively, in dormant Japanese apricot buds. Therefore, we hypothesize that PmDAM6 represses the bud break competency during dormancy and bud break stages in Japanese apricot by modulating abscisic acid and cytokinins accumulation in dormant buds.

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“…tauschii, where tiller bud development was inhibited, suggesting they negatively regulated tiller bud outgrowth. ABA can induce the dormancy of seeds and buds (Shu et al, 2016;Nguyen and Emery, 2017). Therefore, higher levels of ABA in BPS at HPD might prevent the Ae.…”

Section: Discussionmentioning

confidence: 99%

Regulation of Aegilops tauschii Coss Tiller Bud Growth by Plant Density: Transcriptomic, Physiological and Phytohormonal Responses

Cui

Chen

et al. 2020

Front. Plant Sci.

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Aegilops tauschii Coss is one of the most hazardous weeds that severely infests wheat fields in China. The tillering ability of Ae. tauschii strongly affects the occurrence and spread by influencing its seed output. In this study, Ae. tauschii was sown at low plant density (LPD) and high plant density (HPD) to investigate the effect of plant density on tiller bud outgrowth and its potential regulators using RNA-Seq. Additionally, the chlorophyll content and photosynthesis, soluble sugar and phytohormone levels were also determined at different plant densities. The results showed that an increased plant density significantly inhibited the elongation of tiller buds in the axil of the first leaf at 15 days after planting, with 7.69 mm at LPD and 1.69 mm at HPD. A total of seven putative tiller-related genes were selected and validated using quantitative real-time PCR. Furthermore, chlorophyll levels, photosynthetic efficiency, and soluble sugar contents were distinctly inhibited by HPD in Ae. tauschii, which may be responsible for the restriction of tiller bud growth. In addition, differentially expressed genes (DEGs) were markedly enriched in indole-3-acetic acid (IAA), abscisic acid (ABA), and gibberellin metabolism and signaling. Accordingly, the levels of ABA and gibberellin A3 in Ae. tauschii were strikingly higher at HPD compared with those at LPD, yet the reverse tendency was observed for IAA. Undoubtedly, such results will be highly beneficial for illuminating the underlying regulators of the Ae. tauschii tillering response to plant density and may provide new ideas for the control of this weed in the future.

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Is ABA the earliest upstream inhibitor of apical dominance?

Abstract: HighlightThis article comments on:Holalu SV Finlayson SA. 2017. The red light:far red light alters Arabidopsis axillary bud growth and abscisic acid signaling before stem auxin changes. Journal of Experimental Botany 67, 943–952.

Cited by 19 publications

References 17 publications

Developmental analysis of the early steps in strigolactone‐mediated axillary bud dormancy in rice

Developmental analysis of the early steps in strigolactone‐mediated axillary bud dormancy in rice

Overexpression of Prunus DAM6 inhibits growth, represses bud break competency of dormant buds and delays bud outgrowth in apple plants

Regulation of Aegilops tauschii Coss Tiller Bud Growth by Plant Density: Transcriptomic, Physiological and Phytohormonal Responses

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