The Photosynthetic Characteristics of Apple Leaves (CV. Golden Delicious) During their Early Growth

1979 ◽  
pp. 39-48 ◽  
Author(s):  
R. L. Watson ◽  
J. J. Landsberg
Keyword(s):  
Early Growth ◽  
Photosynthetic Characteristics ◽  
Apple Leaves ◽  
Golden Delicious

scholarly journals Gibberellin promotion of physiological leaf spot in detached 'Golden Delicious' apple leaves.

1975 ◽  
Vol 23 (2) ◽  
pp. 126-130
Author(s):  
W.J. Kender ◽  
H. Jonkers
Keyword(s):  
Leaf Spot ◽  
Growth Substance ◽  
Apple Leaves ◽  
Golden Delicious ◽  
Detached Leaves

The development of leaf spot, a non-pathogenic disorder specific to the cv. Golden Delicious, was accelerated in detached leaves (whether previously unmarked or showing leaf spot) when these were cultured in solutions of GA3 or GA4+7 at 10, 50 or 100 mg/l for 72 h. About 15% of the foliage on the trees exhibited leaf spot at the time selected leaves were detached for culture. In a second experiment with cultured leaves the interaction of PBA and GA4+7 applied simultaneously was highly synergistic in increasing the severity of the disorder when compared with the effect of either growth substance alone. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals FOLIAR APPLICATION OF BENZYLADENINE INCREASES ENDOGENOUS LEAF CYTOKININ IN APPLE

HortScience ◽  
1991 ◽  
Vol 26 (5) ◽  
pp. 480d-480 ◽  
Author(s):  
Robin A. Cohen ◽  
Duane W. Greene
Keyword(s):  
Growth Regulator ◽  
Foliar Application ◽  
Foliar Spray ◽  
Application Rate ◽  
Endogenous Cytokinin ◽  
Full Bloom ◽  
Apple Leaves ◽  
Golden Delicious

Two experiments were conducted to examine the effects of growth regulator application on cytokinin levels in developing apple leaves. In experiment 1, gibberellin GA4/7 (100 mg·liter-1) and benzyladenine (BA, 100 mg·liter-1) were applied alone or in combination as a foliar spray to `Golden Delicious' 7 days after full bloom. In experiment 2, BA was applied at 50 or 100 mg·liter-1 as a foliar spray to `Morespur McIntosh' 18 days after full bloom. Trans-zeatin ribosidelike (t-ZR) levels were determined by immunoassay. In experiment 1, GA1/7 had no effect and BA increased t-ZR-like levels. In experiment 2, BA increased t-ZR levels quadratically with application rate. The increase in endogenous cytokinin levels with BA treatment occured within 2 hours. Initially, t-ZR-like levels were 47 times higher in the BA (100 mg·liter-1) treated leaves as compared to check leaves. Over the next 8 days, t-ZR-like content in treated leaves decreased in a cubic manner.

scholarly journals EFFECTS OF FRUIT AND GIRDLING ON GAS EXCHANGE, SPECIFIC LEAF WEIGHT, WATER POTENTIAL, AND CARBOHYDRATE CONTENT OF APPLE LEAVES

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1166a-1166
Author(s):  
Timothy E. Elkner ◽  
J. A. Barden ◽  
M. M. Kushad ◽  
D. D. Wolf
Keyword(s):  
Gas Exchange ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Reducing Sugars ◽  
Nonstructural Carbohydrates ◽  
Specific Leaf Weight ◽  
Total Nonstructural Carbohydrates ◽  
Apple Leaves ◽  
Golden Delicious ◽  
Leaf Resistance

Fruiting spurs (`Red Prince Delicious') (RD) and shoots (`Sundale Spur Golden Delicious') (CD) with three leaf:fruit ratios and comparable nonfruiting spurs and shoots were girdled on 7 September 1988. An interaction between fruiting status and time existed for most parameters measured on both cultivars while there was no effect of leaf:fruit ratio. At 1 day after treatment (DAT) few differences existed due to fruiting status on either cultivar. At 8 DAT with RD and at 4 and 8 DAT with GD, Pn, transpiration (Tr), leaf water potential (ψ L), and nonreducing sugars were greater on fruiting than nonfruiting spurs and shoots while leaf resistance (RL), SLW, and starch were lower on fruiting spurs. In nonfruiting spurs and shoots Pn, Tr, and ψL tended to decrease while RL and SLW increased with time whereas m fruiting spurs and shoots most parameters remained constant. Total nonstructural carbohydrates, reducing sugars, and starch were greater in nonfruiting than fruiting spurs and shoots.

Photosynthetic characteristics of the leaves of 'Golden Delicious' appletrees

1978 ◽  
Vol 1 (1) ◽  
pp. 51-58 ◽  
Author(s):  
R. L. WATSON ◽  
J. J. LANDSBERG ◽  
M. R. THORPE
Keyword(s):  
Photosynthetic Characteristics ◽  
Golden Delicious

scholarly journals Difenoconazole-based fungicides for orchard protection

2021 ◽  
Vol 34 ◽  
pp. 04004
Author(s):  
Lyudmila Grishechkina ◽  
Marina Podgornaya ◽  
Victor Dolzhenko
Keyword(s):  
Apple Scab ◽  
Comparative Assessment ◽  
Flowering Stage ◽  
Apple Leaves ◽  
Rostov Region ◽  
Golden Delicious ◽  
Apple Cultivars ◽  
Krasnodar Region ◽  
Toxic Load

A comparative assessment of the effectiveness of 4 difenoconazole-based fungicides in the fight against apple scab in the Krasnodar region and the Rostov Region for several years has been carried out. The preparations Sercadis Plus, SC were applicated at a rate of application of 1.2 l/ha; Embrelia, SC – 1.5 l/ha; Cidely Top, DС – 0.7 l/ha and Tersel, WG – 2.5 kg/ha three times, against different infectious backgrounds, starting with the “pink bud” phenophase (the end of flowering stage). The following apple cultivars were used: Idared, Champion and Golden Delicious. Research has shown that all studied fungicides significantly reduced the scab infestation of apple leaves and fruits. This resulted in obtaining additional yield in the range of 12.6-46.0%. The fruit grade was high after the treatments: 93.0-100% in the Krasnodar region and 81.5-91.5% in the Rostov Region, while in the nil treatment the percentages of standard products were 68.5% and 44.6%, respectively. According to the toxic load indicator, difenoconazole-based fungicides, such as Embrelia, SC (11.6 LD50 per hectare), were less dangerous for the fruit cenosis.

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

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