Plant water requirement of ‘Hamlin’ sweet orange in cold temperature conditions

Barkataky, Smita; Morgan, Kelly T.; Ebel, Robert C.

doi:10.1007/s00271-011-0321-1

Cited by 10 publications

(8 citation statements)

References 27 publications

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“…HLB had a significant impact on plant water deficits compared to the healthy trees (13% difference), and Cu treatments did not impact plant water deficits, as measured by Ψ xylem . The levels of Ψ xylem in this study indicated well-watered conditions, which typically do not influence k s or impact growth [3,4,25]. However, HLB and Cu treatments impacted parameters that influence Ψ xylem including T sa /U sa and R r+s .…”

Section: Discussionmentioning

confidence: 75%

“…Water uptake by roots is driven by the water potential gradient between the xylem and soil with the rate of uptake modified by the resistances along the path of flow: U p = (Ψ soil − Ψ xylem )/R r+s where Ψ xylem is the water potential of the xylem (MPa), Ψ soil is the water potential of the soil (MPa), and R r+s is the root and soil resistances (MPa·mmoles −1 ·s), which are in series and, therefore, cumulative. Ψ xylem is the most commonly used measure of plant water deficits for tree fruit crops as a direct measure of hydraulic strain within the plant and is relatively uniform throughout the canopy and varying by only 0.01 MPa·m −1 in elevation due to gravitational forces [4,5,7,25,26,27], and (3) for the simplicity in its measurement. R r+s includes the resistance that water encounters as it traverses the soil to the root surface (R s ) and the resistance encountered by the water having to traverse the endodermis (R r ).…”

Section: Methodsmentioning

confidence: 99%

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Interaction of Huanglongbing and Foliar Applications of Copper on Water Relations of Citrus sinensis cv. Valencia

Hamido

Ebel

Morgan

2019

Plants

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The following study was conducted to determine the impact of frequent foliar Cu applications on water relations of Huanglongbing (HLB)-affected Citrus sinensis cv. ‘Valencia’. HLB in Florida is putatively caused by Candidatus Liberibacter asiaticus that is vectored by the Asian citrus psyllid. The experiment was conducted in a psyllid-free greenhouse with trees grown in Immokalee fine sand soil with the trees well-maintained to promote health. Cu was applied to the foliage at 0×, 0.5×, 1×, and 2× the commercially recommended rates, which were 0, 46, 92, and 184 mM, respectively, with applications made 3× in both 2016 and 2017. Previous studies indicate that HLB causes roots to decline before the canopy develops symptoms, which increases the ratio between the evaporative surface area of the canopy to the uptake surface area of roots and increases the hydraulic strain within the tree. In the current study, overall growth was suppressed substantially by HLB and Cu treatments but the ratio between evaporative surface area (leaf surface area) and the uptake surface area of roots (feeder root surface area) was not affected by either treatment. Stem water potential (Ψxylem), which was used as a measure of plant water deficits and the hydraulic strain within the tree, was significantly 13% lower for HLB-affected trees than the non-HLB controls but were not affected by Cu treatments. All Ψxylem measurements were in a range typical of well-watered trees conditions. Stomatal conductance (ks) and root and soil resistances (Rr+s) were not affected by HLB and Cu. The results of this experiment suggest that tree leaf area and feeder roots are reduced when the trees are affected by HLB or are treated with foliar Cu applications such that plant water deficits are not significantly different over that of the controls.

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Section: Discussionmentioning

confidence: 75%

Section: Methodsmentioning

confidence: 99%

Interaction of Huanglongbing and Foliar Applications of Copper on Water Relations of Citrus sinensis cv. Valencia

Hamido

Ebel

Morgan

2019

Plants

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“…The generally lower Y stem values recorded in the 'Orogrande' A, 'Orogrande' B, 'Marisol', and 'Clemenules' orchards in comparison with those obtained in the 'Fortune' and 'Navel Lane Late' orchards were most likely because most of the measurements performed in these latter orchards were taken during winter time, when harvest takes place for these cultivars and when a decrease in the water status of citrus trees is often observed (Intrigliolo et al, 2008) as a consequence of a decrease in the soil temperature (Barkataki et al, 2013). In the case of the orchards planted with 'Orogrande' (A and B), low Y stem values were also recorded during summer, around -1.4 MPa, which could be considered as a value indicative of some moderate water stress in citrus trees (Ballester et al, 2014).…”

Section: Discussionmentioning

confidence: 95%

Effects of Trunk-shaker Harvester and Ethephon on Plant Water Status, Leaf Gas Exchange, and Yield of Citrus Cultivated under Mediterranean Conditions

Moreno¹,

Intrigliolo²,

Ballester³

et al. 2016

horts

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This work was aimed to study whether the application of ethephon as an abscission agent and mechanical harvest using a trunk shaker have any effect on plant water status, leaf gas exchange, and yield of mandarin and orange trees cultivated under Mediterranean conditions. The experiment was performed from 2008 to 2011 in five commercial orchards where parameters related to the plant water status and leaf gas exchange were measured before the application of ethephon, at harvest time and at different occasions after harvest. In addition, the effects of ethephon dose on yield in the current and subsequent seasons were also evaluated. Results showed that ethephon applications and mechanical harvest did not detrimentally affect plant water status in any of the cultivars studied. Furthermore, either had no effect or had a short temporal decrease effect on leaf gas exchange depending on the cultivar studied although with no consequences for the fruit yield obtained during the current season. Increasing ethephon doses led to fruit yield reductions in the mandarin ‘Orogrande’ trees in subsequent seasons. When trunk-shaker and ethephon applications were combined, however, yields from the late-maturing orange significantly decline in subsequent seasons. Overall, results show that using a trunk shaker is a viable technique to mechanically harvest citrus trees destined to both fresh and industry market and can be considered as an alternative to the traditional manual harvest usually performed under Mediterranean conditions. However, its use cannot be recommended for late-maturing oranges, such as the ‘Navel Lane Late’ in which mature fruit and fruitlets coexist in the tree at the time of harvest.

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“…The results of the study documented the socio-economic importance, horticulture potential and domestication trends of these wild and semi-domesticated species of citrus. Barkataky et al (2013) investigated the plant water requirement of 'Hamlin' sweet orange in cold temperature conditions. The objective of their study was to determine the effect of various temperature regimes on water use of sweet orange.…”

Section: Introductionmentioning

confidence: 99%

Land suitability procedure for sustainable citrus planning using the application of the analytical network process approach and GIS

Zabihi

Ahmad

Vogeler

et al. 2015

Computers and Electronics in Agriculture

109

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Plant water requirement of ‘Hamlin’ sweet orange in cold temperature conditions

Cited by 10 publications

References 27 publications

Interaction of Huanglongbing and Foliar Applications of Copper on Water Relations of Citrus sinensis cv. Valencia

Interaction of Huanglongbing and Foliar Applications of Copper on Water Relations of Citrus sinensis cv. Valencia

Effects of Trunk-shaker Harvester and Ethephon on Plant Water Status, Leaf Gas Exchange, and Yield of Citrus Cultivated under Mediterranean Conditions

Land suitability procedure for sustainable citrus planning using the application of the analytical network process approach and GIS

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