Foliar-Applied Tryptophan Increases Total Yield and Fruit Size of Navel Orange and Clementine Mandarin

Pillitteri, L. J.; Bertling, I.; Khuong, Trinh Quang; Chao, Chih-Cheng T.; Lovatt, Carol J.

doi:10.17660/actahortic.2010.884.99

Cited by 9 publications

(8 citation statements)

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“…L-tryptophan (TRP), an amino acid and a precursor of IAA, is used to promote citrus fruit set and size. Application of DL-TRP (10-7 M) on 'Frost' nucellar navel orange trees grown for commercial purposes at the end of cell division stage in fruit development (July), when fruit were at most peel thickness, greatly enhanced the 4year cumulative total yield and yield of commercially valuable large size fruit (6.9-8.8 cm), which is consistent with a positive effect of L-TRP on fruit set and size (Pillitteri et al, 2010). Mosa et al (2021) found a high increase in fruit hardness by treatment of tryptophan and glycine on apple fruits.…”

Section: Physical Characteristics Of Fruitssupporting

confidence: 69%

Response of “Le Conte” cv. Pear Trees to Some Bio- Stimulants Foliar Applications

Awad

2023

Journal of the Advances in Agricultural Researches

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This study was carried out during 2021 and 2022 to investigate the role of spraying tryptophan, biozyme and fulvic acid on Le Conte pear cv. grown at a private orchard in Borg El-Arab, Alexandria, Egypt. The experiment design was a Randomized Complete Block Design (RCBD). Ten treatments with four replicates were applied three times; start of growing season, full bloom and one month after fruit set, the treatments were; control, tryptophan at 50, 100 and 150 ppm, biozyme at 2, 4 and 6 ppm and fulvic acid at 500, 1000 and 1500 ppm. The results showed that all treatments enhanced the shoot length and thickness, leaf area and total chlorophyll compared to the control, the highest value of shoot length was obtained by 1500 ppm fulvic acid in 2021 and 6 ppm biozyme in 2022, In the meantime, 1500 ppm fulvic acid caused significant increment, in shoot thickness, leaf area and total chlorophyll, fruit set (%), the number of fruits per tree, yield (kg/ tree) and the least fruit drop % in 2021 and 2022. All treatments enhanced the fruit physical and chemical properties and fulvic acid at 1500 ppm caused remarkable increment in fruit weight and length in the second season and fruit diameter in both seasons. Tryptophan at 150 ppm had the highest percentages of total soluble solids (TSS), total sugars and reducing sugars in the two seasons, while it caused the highest value of TSS/ acid in 2022 and non-reducing sugars % in the first season. In the meantime, fulvic acid at 1500 ppm significantly increased the TSS/ Acid in 2021 and 2022 seasons, in one side and reducing sugars % in the first season, on the other side. In contrast, all treatments reduced acidity (%) and ascorbic acid mg/100ml compared with control. The level of minerals improved by all treatments in comparison with the control, 6 ppm biozyme caused the highest value in phosphorus and potassium % and copper ppm in 2020 and 2021. 1500 ppm fulvic acid estimated the highest value in nitrogen (%), manganese and copper (ppm), whereas, the increase in leaf zinc ppm was obtained by 150 ppm tryptophan in the two seasons.

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Section: Physical Characteristics Of Fruitssupporting

confidence: 69%

Response of “Le Conte” cv. Pear Trees to Some Bio- Stimulants Foliar Applications

Awad

2023

Journal of the Advances in Agricultural Researches

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“…[55] Converting l-tryptophan into its ionic form stabilized and increased its auxin activity, which is described as differentiated depending on the plant species. [51,[56][57][58][59][60][61][62] The application of l-tryptophan in the form of an acid in the cultivation of hydroponic lettuce has so far been described as unfavorable, which confirms the application potential of the synthesized AAILs and QASs. [63] For salts 2-5 and 14-18, the concentration of macro-and microelements absorbed by the plants, the level of chlorophyll fluorescence and the indicators of plant photosynthesis activity were determined.…”

Section: Biological Activitymentioning

confidence: 99%

Conversion of l‐Tryptophan Derivatives into Biologically Active Amino Acid Ionic Liquids

et al. 2021

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Natural auxins are a group of plant hormones that affect plant growth and development. The most common auxin is indole-3acetic acid (IAA), which is mainly synthesized from tryptophan. Since converting synthetic auxins into an ionic liquid increases their herbicidal activity, an attempt was made to synthesize new amino acid ionic liquids (AAILs) with l-tryptophanate anions. As a result of the synthesis, two homologous series, tetraalkylammonium l-tryptophanates and dialkyldimethylammonium l-tryptophanates, were obtained with yields exceeding 95 %. For the obtained AAILs, basic physicochemical properties (solubility in solvents of different polarity, thermal stability, phase changes, and surface activity) were determined, and whether the obtained salts act as growth stimulants for lettuce (Lactuca sativa L.) was evaluated. The transformation of l-tryptophan into AAILs improved the physicochemical properties and increased the auxin activity. In addition, the higher content of nutrients (micro-and macroelements) made lettuce a healthier food product.

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“…On the other hand, (Carol, 2001) has approved the use of tryptophan and analogs as a plant growth regulator, and he reported that leaves, flowers, and fruits of Washington navel orange take up, translocate, and convert tryptophan to IAA. In addition, the application of tryptophan to Frost navel orange and Fina Clementine trees at the end of the fruit cell division stage significantly increased the cumulative total yield with no negative effect on fruit quality (Pillitteri et al, 2010). In the same concern, (Khuong et al, 2010) on navel orange, Clementine mandarin, (Hanafy et al, 2012) on Valencia orange, and (Omima et al, 2014) on the Manfalouty pomegranate variety.…”

Section: Introductionmentioning

confidence: 96%

Effect of Tryptophan, Salicylic and Ascorbic Acids On Productivity and Fruit Quality of Navel Orange Trees

2022

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A field experiment was carried out during the 2019 and 2020 seasons on 12-year-old Navel orange trees grown in El Bustan district, El Behera Governorate, Egypt. Three concentrations (25, 50 and 75 ppm) of tryptophan, (100, 200 and 300 ppm) of salicylic, and (500, 750 and 1000 ppm) of ascorbic as well as the control (tape water) were foliar application three times a year, i.e., at full bloom stage and the second one was performed just after fruit setting and the third was sprayed four weeks later. The results showed that, tryptophan treatment at 75 ppm improved shoot length, tree height, tree canopy volume, fruit weight, fruit length, fruit diameter, and fruit volume. Moreover, salicylic as foliar application at 300 ppm increased fruit set percentage, fruit retention percentage, numbers of fruits/ tree, yield, yield efficiency, peel thickness, juice weight, fruit juice percentage, TSS, ascorbic acid content, and total sugars content.

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Foliar-Applied Tryptophan Increases Total Yield and Fruit Size of Navel Orange and Clementine Mandarin

Cited by 9 publications

References 0 publications

Response of “Le Conte” cv. Pear Trees to Some Bio- Stimulants Foliar Applications

Response of “Le Conte” cv. Pear Trees to Some Bio- Stimulants Foliar Applications

Conversion of l‐Tryptophan Derivatives into Biologically Active Amino Acid Ionic Liquids

Effect of Tryptophan, Salicylic and Ascorbic Acids On Productivity and Fruit Quality of Navel Orange Trees

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