Viroid Dwarfing for High Density Citrus Plantings

Hutton, Ron J.; Broadbent, P.; Bevington, K. B.

doi:10.1002/9780470650776.ch6

Cited by 15 publications

(17 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Historically, the trends of tree spacing in all citrus producing areas of the world have been towards higher tree densities to obtain greater yields per unit of land surface (Boswell et al , 1970; Platt, 1973; Tucker & Wheaton, 1978). High‐density citrus plantings also offer an effective means for more efficient and economic grove management such as use of irrigation water and fertilisers, ease of pest and disease control, and harvesting (Phillips, 1978a; Tucker & Wheaton, 1978; Broadbent et al , 1986; Gillings et al , 1991; Semancik et al , 1997; Hutton et al , 2000). A goal of the high‐density plantings has also been the maximisation of productivity and income during the early years of the grove's life through moving the production curve up in time by using more trees per area of soil and intensive management.…”

Section: Introductionmentioning

confidence: 99%

“…As originally proposed by Cohen (1968) and Mendel (1968), the use of viroids as a means of producing dwarfed citrus trees has been under continuous investigation (Long et al , 1972; Stannard et al , 1975; Bevington & Bacon, 1977; Castle, 1978; Duncan et al , 1978; Bacon, 1980; Broadbent et al , 1992; Pérez et al , 1992; Semancik et al , 1997, 2002; Stuchi et al , 2007; Vidalakis et al , 2007, 2010b) and reviewed by Hutton et al (2000) and Semancik (2003).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Citrus dwarfing viroid: effects on tree size and scion performance specific to Poncirus trifoliata rootstock for high-density planting

Vidalakis

Pagliaccia

Bash

et al. 2010

Annals of Applied Biology

View full text Add to dashboard Cite

The term 'transmissible small nuclear ribonucleic acids' (TsnRNAs) describes well-characterised viroid RNA species that do not induce any pronounced disease syndromes in specific citrus hosts, but rather act as regulatory genetic elements modifying tree performance. The canopy volume (CV) of 13-yearold navel orange trees (Citrus sinensis) on Poncirus trifoliata rootstock treated with TsnRNA-IIIb (syn. Citrus dwarfing viroid) was reduced by 45% and 53.5% in standard-density (6 m × 6.7 m) or high-density (3 m × 6.7 m) plantings, respectively. The total yield of eight consecutive harvests was not affected significantly by the TsnRNA-IIIb treatments or the two planting densities. However, the yield per land surface unit (Y/LSU) was almost doubled (increased by 97.5%) for the high-density plantings over the standard-density plantings of the untreated controls. The Y/LSU of the TsnRNA-IIIb treated navel orange trees in the standard-density planting was reduced by 32.7%. The TsnRNA-IIIb treatment in both planting densities concentrated significantly more fruit production (approximately 60%) in the economically advantageous middle canopy height zone (0.6-2.4 m) in comparison with the untreated controls (35%). Fruit grade, size, appearance, organoleptic characteristics or time of maturation of the TsnRNA-IIIb dwarfed navel trees were not significantly different between the two planting densities and the controls. Fruit with higher commercial value was produced in the TsnRNA-IIIb dwarfed navel trees in the high-density planting by 3.9% and 4.6% over the TsnRNA-IIIb or controls in standard-density planting respectively. The increase in Y/LSU and fruit value for the TsnRNA-IIIb treated navel trees in the high-density plantings in combination with the reduced management cost of dwarfed trees could result in substantial higher profits for a commercial grove despite the higher establishment cost of high-density plantings.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Citrus dwarfing viroid: effects on tree size and scion performance specific to Poncirus trifoliata rootstock for high-density planting

Vidalakis

Pagliaccia

Bash

et al. 2010

Annals of Applied Biology

View full text Add to dashboard Cite

show abstract

“…In general, CEVd and specific variants of HSVd induce exocortis and cachexia diseases, respectively on sensitive citrus hosts (Semancik and Weathers 1972;Semancik et al 1988). In addition, some CBLVd, HSVd, and CVd-III variants can induce dwarfing in citrus cultivars grafted on trifoliate orange (Poncirus trifoliata) rootstock (Ashulin et al 1991;Semancik et al 1997;Hutton et al 2000). CVd-IV, which appears to be less widespread than the other four viroids, can cause severe bark cracking on susceptible species (Puchta et al 1991).…”

mentioning

confidence: 97%

A rapid one-step multiplex RT-PCR assay for the simultaneous detection of five citrus viroids in China

et al. 2008

View full text Add to dashboard Cite

show abstract

“…However, antagonistic interactions between CEVd and CDVd or CBLVd and CDVd were observed in Clementines trees grafted on trifoliate orange (Vernière et al, 2006). CDVd alone or in combination with a non-cachexia HSVd source also is capable to reduce the tree size (Hutton et al, 2000).…”

mentioning

confidence: 99%

Identification and characterization of viroids in 'Navelina ISA 315' sweet orange

Eiras

Silva

Stuchi

et al. 2013

Trop. plant pathol.

View full text Add to dashboard Cite

To date, seven species of viroids have been described infecting Citrus. However, only Citrus exocortis viroid (CEVd), Hop stunt viroid (HSVd) and Citrus dwarfing viroid (CDVd) have been reported in this crop in Brazil. The aim of our work was to identify and characterize viroids infecting plants of 'Navelina ISA 315' sweet orange cultivar grafted on 'Rangpur' lime from field experiments located in Bebedouro, SP, that showed gumming in the bark and wood symptoms. Biological indexing was done on the indicator host 'Clemelin 1120' tangor plants that reacted with typical gumming symptoms. Viroid infection was assessed by graft-inoculation of buds from the field trees on 'Etrog' citron plants grafted on 'Rangpur' lime, followed by RNA extraction and sPAGE analysis. RNAs were subjected to RT-PCR with primers for citrus viroids. The full-length amplified products were sequenced and compared to those available in the GenBank. The trees were found to be infected with cachexia (Ca) variants of HSVd-Ca or HSVd-Ca plus CDVd. The results indicate that efforts have to be made to increase and stimulate the indexing programs, to maintain plants healthy and to develop sanitary programs focused on reducing the spread of viroids and other graft-transmissible agents.

show abstract

Viroid Dwarfing for High Density Citrus Plantings

Cited by 15 publications

References 57 publications

Citrus dwarfing viroid: effects on tree size and scion performance specific to Poncirus trifoliata rootstock for high-density planting

Citrus dwarfing viroid: effects on tree size and scion performance specific to Poncirus trifoliata rootstock for high-density planting

A rapid one-step multiplex RT-PCR assay for the simultaneous detection of five citrus viroids in China

Identification and characterization of viroids in 'Navelina ISA 315' sweet orange

Contact Info

Product

Resources

About