2007
DOI: 10.1104/pp.106.093708
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Abstract: Increased-branching mutants of garden pea (Pisum sativum; ramosus [rms]) and Arabidopsis (Arabidopsis thaliana; more axillary branches) were used to investigate control of cytokinin export from roots in relation to shoot branching. In particular, we tested the hypothesis that regulation of xylem sap cytokinin is dependent on a long-distance feedback signal moving from shoot to root. With the exception of rms2, branching mutants from both species had greatly reduced amounts of the major cytokinins zeatin ribosi… Show more

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Cited by 94 publications
(107 citation statements)
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References 42 publications
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“…Together, these results indicate that CK signaling is not only modulated by decapitation, as reported before in other species (Tanaka et al, 2006;Foo et al, 2007), but also by the light environment and that the light effect on RhARR3 and RhARR5 is strong and long lasting.…”
Section: Darkness Affects Ck Signal During Bud Outgrowthsupporting
confidence: 61%
“…Together, these results indicate that CK signaling is not only modulated by decapitation, as reported before in other species (Tanaka et al, 2006;Foo et al, 2007), but also by the light environment and that the light effect on RhARR3 and RhARR5 is strong and long lasting.…”
Section: Darkness Affects Ck Signal During Bud Outgrowthsupporting
confidence: 61%
“…However, xylem cytokinin has been shown to be reduced in strigolactone pathway mutants for Arabidopsis, pea, and petunia (Morris et al, 2001;Foo et al, 2007;Drummond et al, 2009). The observations that cytokinin is synthesized in the aerial parts of the plant (Nordströ m et al, 2004) and that increasing cytokinin production in the roots did not increase branching (Faiss et al, 1997) suggest that root-derived cytokinin is not the mobile positive branching signal seen in our experiments.…”
Section: Discussionmentioning
confidence: 99%
“…To date, most of the models proposed to explain the action of the CCD7 and CCD8 proteins place them as consecutive steps in a biochemical pathway leading to the production of a single branch outgrowthsuppressing hormone (Booker et al, 2004;Foo et al, 2007;Hayward et al, 2009). The CCD7 and CCD8 proteins are required to produce strigolactones (GomezRoldan et al, 2008;Umehara et al, 2008) and have been shown to cleave a range of carotenoids in bacteria (Booker et al, 2004;Schwartz et al, 2004;Auldridge et al, 2006).…”
Section: Discussionmentioning
confidence: 99%
“…Cytokinins are also known to play a role in axillary branching in the shoot. Increased levels of strigolactones in pea and Arabidopsis lead to reduced cytokinin levels in the xylem sap, although levels in the shoot remain unchanged (Foo et al, 2007). Dun et al (Dun et al, 2009) found that the buds of strigolactone-insensitive plants also have reduced sensitivity to cytokinin supplied from the vasculature.…”
Section: Crosstalk With Strigolactonementioning
confidence: 99%