Branch propagation, not cladoptosis, permits dispersive, clonal reproduction of riparian cottonwoods

Rood, Stewart B.; Kalischuk, Andrea; Polzin, Mary Louise; Braatne, Jeffrey H.

doi:10.1016/s0378-1127(03)00276-7

Cited by 51 publications

(60 citation statements)

References 24 publications

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“…Populus and other perennial species adapted to riparian ecosystems naturally propagate clonally when stems or branches detached by a natural disturbance are carried downstream and lodge in a moist environment conducive to rooting (Rood et al, 2003). For many species, therefore, clonal propagation via adventitious root formation is a natural complement to sexual propagation by seeds.…”

mentioning

confidence: 99%

The Cytokinin Type-B Response Regulator PtRR13 Is a Negative Regulator of Adventitious Root Development inPopulus

et al. 2009

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Adventitious root formation at the base of plant cuttings is an innate de novo organogenesis process that allows massive vegetative propagation of many economically and ecologically important species. The early molecular events following shoot excision are not well understood. Using whole-genome microarrays, we detected significant transcriptome remodeling during 48 h following shoot removal in Populus tremula 3 Populus alba softwood cuttings in the absence of exogenous auxin, with 27% and 36% of the gene models showing differential abundance between 0 and 6 h and between 6 and 24 h, respectively. During these two time intervals, gene networks involved in protein turnover, protein phosphorylation, molecular transport, and translation were among the most significantly regulated. Transgenic lines expressing a constitutively active form of the Populus type-B cytokinin response regulator PtRR13 (DDDKPtRR13) have a delayed rooting phenotype and cause misregulation of CONTINUOUS VASCULAR RING1, a negative regulator of vascularization; PLEIOTROPIC DRUG RESISTANCE TRANS-PORTER9, an auxin efflux transporter; and two APETALA2/ETHYLENE RESPONSE FACTOR genes with sequence similarity to TINY. Inappropriate cytokinin action via DDDKPtRR13 expression appeared to disrupt adventitious root development 24 h after shoot excision, when root founder cells are hypothesized to be sensitive to the negative effects of cytokinin. Our results are consistent with PtRR13 acting downstream of cytokinin to repress adventitious root formation in intact plants, and that reduced cytokinin signaling after shoot excision enables coordinated expression of ethylene, auxin, and vascularization pathways leading to adventitious root development.

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The Cytokinin Type-B Response Regulator PtRR13 Is a Negative Regulator of Adventitious Root Development inPopulus

et al. 2009

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“…These observations suggested that beaver foraging may be impacting S. sitchensis population genetic structure, gene flow, and reproductive strategy. As willows can propagate themselves clonally from severed branch fragments (Douglas 1989;Barsoum 2002;Rood et al 2003), harvest and relocation of willows by beavers may induce willow asexual reproduction within and between populations.…”

Section: Initial Investigations Of S Sitchensis's Reproductive Stratmentioning

confidence: 99%

“…Columbia originated from beaver browse (Rood et al 2003). This frequency is substantially lower than that seen S. sitchensis (100%o of fragments due to beaver browse) and this could be explained by a variation in climatic and site characteristics.…”

Section: Asexual Reproductionmentioning

confidence: 99%

“…Barsoum (2002) showed that only 12% of translocated willow fragments originated from beaver forage, although the majority of vegetative reproduction in Populus nigra on sandbars was placed there by beavers. Other studies have shown that 0% -7% of mature willow and cottonwoods originated from beaver browse (Rood et al 2003;Cooper et al 2005).…”

Section: Introductionmentioning

confidence: 96%

“…Willows are common dioecious riparian plants capable of both sexual and asexual reproduction (Douglas 1989;Barsoum 2002;Rood et al 2003). Reproduction has been observed to have been dominated by sexual propagules (Stamati et al 2007), asexual…”

Section: Introductionmentioning

confidence: 99%

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Reproductive ecology of the Sitka willow (Salix sitchensis ).

Gerwing¹

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Size and position matter: riparian plant establishment from fluvially deposited trees

Francis

2007

Earth Surf Processes Landf

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The sprouting of fluvially deposited trees is an important process for floodplain woodland regeneration along dynamic rivers. This paper investigates how tree size and relative elevation of the location of fluvially deposited trees affects their survival. The survival of newly deposited trees along the River Tagliamento, Italy, was monitored over three field campaigns (2001, 2003 and 2005). A significant negative correlation was found between relative elevation and tree survival, while tree length was significantly positively correlated to survival. Consequently, larger trees deposited at lower elevations have a greater likelihood of regeneration, although the influence of these factors varied according to genera.survivorship were analysed using point-biserial correlation, and differences between genera were investigated using Kruskal-Wallis and Mann-Whitney analyses. ResultsThe three surveys included samples of 170, 92 and 39 trees in 2001, 2003 and 2005, respectively, of which 66 (39%), 33 (36%), and 22 (56%) were found to be sprouting in July/August following deposition in the previous spring. Increasing relative elevation is detrimental to survivorshipThere was no differentiation between genera according to relative elevations (Kruskal-Wallis; H = 5·098, p = 0·078), indicating that all genera are deposited across the range of elevations found within the active zone. Most trees were deposited between 0·5 and 1·5 m below the elevation of the floodplain woodland, with mean relative elevation being −1·00 m (Figure 2(A)). Surviving trees were found at almost all elevations, but the mean relative elevation of surviving Figure 2. (A) Histogram of relative elevations of deposited trees within the study site from combined survey data. Elevation is expressed in metres below the level of floodplain woodland. (B) Histogram of relative elevations of surviving trees within the study site from combined survey data. Elevation is expressed in metres below the level of floodplain woodland. (C) Histogram of deposited tree lengths (m) within the study site from combined survey data. (D) Histogram of tree lengths (m) of surviving trees within the study site from combined survey data.

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Branch propagation, not cladoptosis, permits dispersive, clonal reproduction of riparian cottonwoods

Cited by 51 publications

References 24 publications

The Cytokinin Type-B Response Regulator PtRR13 Is a Negative Regulator of Adventitious Root Development inPopulus

The Cytokinin Type-B Response Regulator PtRR13 Is a Negative Regulator of Adventitious Root Development inPopulus

Reproductive ecology of the Sitka willow (Salix sitchensis ).

Size and position matter: riparian plant establishment from fluvially deposited trees

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