Accumulation and Metabolism of Bromacil in Pineapple Sweet Orange (Citrus sinensis) and Cleopatra Mandarin (Citrus reticulata)

Weed Science ◽  
1981 ◽  
Vol 29 (1) ◽  
pp. 1-4 ◽  
Author(s):  
L. S. Jordan ◽  
W. A. Clerx
Keyword(s):  
Citrus Sinensis ◽  
Sweet Orange ◽  
Citrus Reticulata ◽  
Minor Metabolite ◽  
A Minor ◽  
Orange Trees ◽  
Conjugated Metabolites ◽  
Cleopatra Mandarin

Young orange [Citrus sinensis (L.) Osbeck ‘Pineapple sweet orange’] trees are more sensitive to bromacil (5-bromo-3-sec-butyl-6-methyluracil) than young mandarin (Citrus reticulata Blanco ‘Cleopatra mandarin’) trees. Pineapple sweet orange roots absorbed twice as much 14C from bromacil, and accumulated three times as much in the leaves, as did Cleopatra mandarin. The amount of conjugated metabolites formed was the same in the roots of the two cultivars, but twice as much formed in the leaves of Cleopatra mandarin as in the leaves of Pineapple sweet orange. The principle metabolite was 5-bromo-3-sec-butyl-6-hydroxymethyluracil; a minor metabolite was tentatively identified as 5-bromo-3-(3-hydroxyl-1-methylpropyl)-6-methyluracil. No 5-bromouracil was detected. Citrus cultivars differ in their ability to accumulate and metabolize bromacil into conjugated nonphytotoxic compounds.

Indian citrus ringspot virus. [Distribution map].

2015 ◽  
Author(s):  
Keyword(s):  
Citrus Sinensis ◽  
Andhra Pradesh ◽  
Uttar Pradesh ◽  
Ringspot Virus ◽  
Citrus Reticulata ◽  
Citrus Aurantium ◽  
Distribution Map ◽  
Virus Distribution ◽  
New Distribution ◽  
Cleopatra Mandarin

Abstract A new distribution map is provided for Indian citrus ringspot virus. Tymovirales: Alphaflexiviridae: Mandarivirus. Hosts: kinnow (Citrus aurantium × Citrus reticulata), Cleopatra mandarin (Citrus reshni) and navel orange (Citrus sinensis). Information is given on the geographical distribution in Asia (India, Andhra Pradesh, Delhi, Gujarat, Haryana, Karnataka, Maharashtra, Punjab, Rajasthan and Uttar Pradesh).

Differentiation between Flavors of Sweet Orange (Citrus sinensis) and Mandarin (Citrus reticulata)

2017 ◽  
Vol 66 (1) ◽  
pp. 203-211 ◽  
Author(s):  
Shi Feng ◽  
Joon Hyuk Suh ◽  
Frederick G. Gmitter ◽  
Yu Wang
Keyword(s):  
Citrus Sinensis ◽  
Sweet Orange ◽  
Citrus Reticulata

scholarly journals Population dynamics of aphids (Aphididae) on orange (Citrus sinensis ‘Thomson Navel’) and mandarin (Citrus reticulata ‘Blanco’)

2016 ◽  
Vol 107 (1) ◽  
pp. 137 ◽  
Author(s):  
Salim LEBBAL ◽  
Malik LAAMARI
Keyword(s):  
Citrus Sinensis ◽  
Common Species ◽  
Aphid Species ◽  
Climatic Conditions ◽  
Citrus Reticulata ◽  
Citrus Fruits ◽  
June July August ◽  
Aphis Spiraecola ◽  
June July ◽  
Orange Trees

Citrus fruits represent one of the most important fruit productions worldwide. However, they suffer from a numerous constraints. Aphids are among the causes of the decline in the production of citrus. In this study, the diversity of citrus aphids and their seasonal occurrence were explored on orange and mandarin, during 2012 and 2013, in an orchard located in Skikda province (Algeria). In total, six different aphid species were found during two years. The most common species was <em>Aphis spiraecola </em>Patch, 1914.  Climatic conditions had an important role in the infestation level by aphids. There were changes of aphid dynamics between the two years of the investigation. No aphids was recorded in six months in 2012 (January, June, July, August, September and December) and in three months in 2013 (January, February and August).  Besides, the number of identified aphid species increased from two to five. On the other hand, the orange trees seemed to be the most infested host species.

Uptake and distribution of chloride, sodium and potassium ions in salt-treated citrus plants

1983 ◽  
Vol 34 (2) ◽  
pp. 133 ◽  
Author(s):  
AM Grieve ◽  
RR Walker
Keyword(s):  
Sweet Orange ◽  
Poncirus Trifoliata ◽  
Potassium Ions ◽  
Citrus Reticulata ◽  
Rangpur Lime ◽  
Rough Lemon ◽  
Young Leaves ◽  
Chloride Accumulation ◽  
Sodium And Potassium ◽  
Cleopatra Mandarin

Seedlings of a range of citrus rootstocks were grown under glasshouse conditions and supplied with dilute nutrient solution containing either 0 or 50 mM NaCl. The partitioning of accumulated chloride and sodium into and within the major organs was compared between plants of Rangpur lime (Citrus reticulata var. austera hybrid?), Trifoliata (Poncirus trifoliata) and sweet orange (C. sinensis). Rootstocks differed in their leaf and stem chloride and sodium concentrations, but there was little or no difference between the rootstocks in root chloride and sodium concentrations. The lowest leaf chloride and sodium concentrations were found in the top region of shoots of all rootstocks. The different patterns of accumulation of chloride and sodium found in the three rootstocks were consistent with the existence of apparently separate mechanisms which operate to limit the transport of these two ions from the roots into the young leaves of citrus plants. The chloride excluding ability of 10 rootstocks and two hybrids was also compared and assessed in relation to rootstock vigour. Sampling from the middle leaves on salt-treated plants enabled a distinction to be made between rootstocks in their chloride accumulation properties. Cleopatra mandarin (C. reticulata), Rangpur lime, Macrophylla (C. macrophylla) and Appleby smooth Seville (C. paradisi x C. sinensis) accumulated significantly less chloride than did Trifoliata and rough lemon (C. jambhiri). Differences in chloride accumulation properties between rootstocks were unrelated to rootstock vigour.

scholarly journals 179 Impact of Rootstock on Maturity and Storage of Valencia Orange Fruits

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 421D-421
Author(s):  
M.M. Khattab ◽  
A.A. Elezaby ◽  
S. ElOraby ◽  
A.M. Hassan
Keyword(s):  
Citrus Sinensis ◽  
Poncirus Trifoliata ◽  
Maturity Stage ◽  
Full Bloom ◽  
Valencia Orange ◽  
Volkamer Lemon ◽  
Orange Trees ◽  
And Storage ◽  
Cleopatra Mandarin ◽  
Troyer Citrange

This investigation was carried out on 13-year-old Valencia orange trees [Citrus sinensis (L.) Osbeck] budded on five different rootstocks. Heat unit accumulation (temperature above 12.5 °C) for fruits worked on the various rootstocks were calculated from full bloom to maturity stage. Valencia fruits on Troyer citrange (C. sinensis × Poncirus trifoliata) and Carrizo citrange (C. sinensis × Poncirus trifoliata) rootstocks matured earlier when compared to those growing on Cleopatra mandarin (C. reticulata Blanco), Volkamer lemon (C. volkameriana Ten. and Pasq.), and sour orange (C. aurantium) rootstocks. The results showed that the Valencia fruits, regardless of rootstock, could be stored for different periods under different conditions. However, in order to avoid degradation in fruit quality, storing periods should not exceed 21, 60, and 120 days under room conditions (25 °C and RH 25% to 35%), 4 °C (RH 80% to 85%), and 8 °C (RH 80% to 85%); respectively.

scholarly journals Apparent Nucleation and Freezing in Various Parts of Young Citrus Trees during Controlled Freezes

HortScience ◽  
1991 ◽  
Vol 26 (5) ◽  
pp. 576-579 ◽  
Author(s):  
George Yelenosky
Keyword(s):  
Tissue Damage ◽  
Citrus Sinensis ◽  
Sweet Orange ◽  
Rapid Progression ◽  
Rough Lemon ◽  
Initial Freezing ◽  
Orange Trees ◽  
Soil Level ◽  
Citrus Trees

One- to 4-year-old sweet orange trees, Citrus sinensis (L.) Osbeck cv. Valencia on rough lemon (C. jambhiri Lush.) rootstock, were used in a series of tests on the depth and stability of supercooling in various parts of greenhouse-grown trees held in pots during controlled freezes. Thermocouples were attached to flowers, fruit, leaves, and wood. Supercooling levels were inconsistent, ranging from – 3C to – 7C. Nucleation was spontaneous and well defined by sharp exotherms. Rapid progression of crystallization (≈ 60 cm·min–1) indicated no major obstacles to ice propagation throughout the tree above soil level. The site of initial freezing was variable, with a tendency for trees to freeze from the base of the stem toward the top. The location of tissue damage did not necessarily correspond to the location of initial freeze event. Freezing in the wood often preceded freezing of flowers.

scholarly journals Citrus Sudden Death Is Transmitted by Graft-Inoculation and Natural Transmission Is Prevented by Individual Insect-Proof Cages

Plant Disease ◽  
2011 ◽  
Vol 95 (2) ◽  
pp. 104-112 ◽  
Author(s):  
Pedro T. Yamamoto ◽  
Renato B. Bassanezi ◽  
Nelson A. Wulff ◽  
Mateus A. Santos ◽  
André L. Sanches ◽  
...  
Keyword(s):  
Sudden Death ◽  
Sweet Orange ◽  
The Other ◽  
Natural Conditions ◽  
Citrus Variegated Chlorosis ◽  
Indicator Plants ◽  
Orange Trees ◽  
Cleopatra Mandarin

Citrus sudden death (CSD) transmission was studied by graft-inoculation and under natural conditions. Young sweet orange trees on Rangpur rootstock were used as indicator plants. They were examined regularly for one or two characteristic markers of CSD: (i) presence of a yellow-stained layer of thickened bark on the Rangpur rootstock, and (ii) infection with the CSD-associated marafivirus. Based on these two markers, transmission of CSD was obtained, not only when budwood for graft-inoculation was taken from symptomatic, sweet orange trees on Rangpur, but also when the budwood sources were asymptomatic sweet orange trees on Cleopatra mandarin, indicating that the latter trees are symptomless carriers of the CSD agent. For natural transmission, 80 young indicator plants were planted within a citrus plot severely affected by CSD. Individual insect-proof cages were built around 40 indicator plants, and the other 40 indicator plants remained uncaged. Only two of the 40 caged indicator plants were affected by CSD, whereas 17 uncaged indicator plants showed CSD symptoms and were infected with the marafivirus. An additional 12 uncaged indicator plants became severely affected with citrus variegated chlorosis and were removed. These results strongly suggest that under natural conditions, CSD is transmitted by an aerial vector, such as an insect, and that the cages protected the trees against infection by the vector.

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