Effect of NAA and CPPU on Fruit drop, Yield and Quality of Avocado Trees

mostafa, Laila yehia; Mostafa, Yehia; El-Berry, I. M.

doi:10.21608/ejoh.2020.44228.1144

“…While, increased fruit retention in NAA treated plants may be due to the delay in the abscission by auxins through preservation of loss of pectin material in middle lamella (Kachave & Bhosle, 2007). NAA sprays also improved fruit set and yield in Gola pear plants (Nimbolkar et al, 2016) which might be related to improvement in the carbohydrate availability to the fruits (Mostafa et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

“…Similar increase in mango fruit length with CPPU was also reported (Kulkarni et al, 2017). Increase in fruit weight with CPPU is mainly due to its effect on cell division and enlargement, and strengthening of sink carbohydrate (Mostafa et al, 2020). CPPU also improves the movement of simple sugars which are involved in the cell expansion and cell elongation and therefore results in the greater fruit length (Mostafa et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

“…Increase in fruit weight with CPPU is mainly due to its effect on cell division and enlargement, and strengthening of sink carbohydrate (Mostafa et al, 2020). CPPU also improves the movement of simple sugars which are involved in the cell expansion and cell elongation and therefore results in the greater fruit length (Mostafa et al, 2020). Increased fruit breadth and weight with NAA may be associated to increase in cell division and cell expansion by auxins (Kaseem et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

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Influence of plant growth substances on reproductive growth, yield and fruit quality of pear (<i>Pyrus communis</i> L.) cv. Punjab Beauty

Paul,

Kaur,

Gill

et al. 2024

J. Hortic. Sci.

0

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Under sub-tropical region, poor fruit set is a major constraint in semi-soft pears resulting in lower fruit yield. To study the effect of plant growth substances on fruit production and quality, the plants of pear cv. Punjab Beauty were sprayed with the plant growth substances viz., boric acid (200, 300 ppm), CPPU (5, 10 ppm), NAA (10, 20 ppm) and P-Ca (150, 300 ppm) at full bloom stage. Among all the applied treatments, boric acid @ 200 ppm proved to be most effective with maximum fruit set (6.91 %), fruit retention (59.9 %) and yield (57.8 kg/plant), while, maximum fruit weight (162.3 g) was observed with NAA (20 ppm). The highest internal fruit quality in terms of maximum TSS (12.4o Brix), TSS/acid ratio (53.4) and ascorbic acid (12.8 mg kg-1) was observed in 200 ppm boric acid. However, the total phenol (30.9 mg GAE/100 pulp) and flavonoid (36.1 mg CE/100 pulp) content was significantly higher with NAA (20 ppm). The plant growth substances reduced the polyphenol oxidase activity in fruits. Overall, the application of boric acid (200 ppm) resulted in improved fruit set, yield and quality in pear cv. Punjab Beauty.

show abstract

Influence of plant growth substances on reproductive growth, yield and fruit quality of pear (<i>Pyrus communis</i> L.) cv. Punjab Beauty

Paul,

Kaur,

Gill

et al. 2024

J. Hortic. Sci.

0

View full text Add to dashboard Cite

Under sub-tropical region, poor fruit set is a major constraint in semi-soft pears resulting in lower fruit yield. To study the effect of plant growth substances on fruit production and quality, the plants of pear cv. Punjab Beauty were sprayed with the plant growth substances viz., boric acid (200, 300 ppm), CPPU (5, 10 ppm), NAA (10, 20 ppm) and P-Ca (150, 300 ppm) at full bloom stage. Among all the applied treatments, boric acid @ 200 ppm proved to be most effective with maximum fruit set (6.91 %), fruit retention (59.9 %) and yield (57.8 kg/plant), while, maximum fruit weight (162.3 g) was observed with NAA (20 ppm). The highest internal fruit quality in terms of maximum TSS (12.4o Brix), TSS/acid ratio (53.4) and ascorbic acid (12.8 mg kg-1) was observed in 200 ppm boric acid. However, the total phenol (30.9 mg GAE/100 pulp) and flavonoid (36.1 mg CE/100 pulp) content was significantly higher with NAA (20 ppm). The plant growth substances reduced the polyphenol oxidase activity in fruits. Overall, the application of boric acid (200 ppm) resulted in improved fruit set, yield and quality in pear cv. Punjab Beauty.

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Post-Bloom CPPU Application Is Effective at Improving Fruit Set and Suppressing Coloration but Ineffective at Increasing Fruit Size in Litchi

Liu

¹

,

Luo

²

,

Wang

³

et al. 2022

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This study aimed to provide a reference for the practical use of forchlorfenuron (CPPU) in the improvement of fruit set and quality (especially size) in litchi (Litchi chinensis Sonn.). CPPU at 5 mg/L was sprayed to fruit clusters of ‘Feizixiao’ at 2, 4, 6 and 8 weeks after female bloom (WAFB) in 2017 and at 2, 4, 6, 8, 9 or 10 WAFB in 2018, with spraying water as the control. The treatments were all effective at suppressing fruit abscission, resulting in higher fruit retention at harvest. Except for treatment at 2 WAFB, which caused stunted fruit and significantly reduced fruit weight, all the treatments had no significant influence on fruit weight and flesh (aril) weight, although CPPU tended to increase pericarp weight and strongly suppressed fruit coloration, and such effects were most significant in treatments at 4, 6 and 8 WAFB. Content of total soluble solids (TSS) in commercially ripe fruit (11WAFB) was not significantly influenced by CPPU applied at any of the stages. Ripe fruit continued to gain redness but lost TSS as it became overripe. CPPU suppressed redness gaining, the effect being stronger in later application. The treatments did not influence TSS loss, but treatments at 4, 6 and 8 WAFB significantly reduced the increase in fruit membrane leakage. In treatment at 6 WAFB, CPPU residue in the pericarp decreased sharply with time but relatively constant in the aril, where it maintained lower than 10 μg/kg, the maximal residue limitation in Australia and the United States. The results suggest that 5 mg/L CPPU is effective at improving fruit set and suppressing fruit pigmentation but has no significant effect on fruit size and TSS accumulation or maintenance in litchi.

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Effect of NAA and CPPU on Fruit drop, Yield and Quality of Avocado Trees

Cited by 3 publications

References 16 publications

Influence of plant growth substances on reproductive growth, yield and fruit quality of pear (<i>Pyrus communis</i> L.) cv. Punjab Beauty

Influence of plant growth substances on reproductive growth, yield and fruit quality of pear (<i>Pyrus communis</i> L.) cv. Punjab Beauty

Influence of plant growth substances on reproductive growth, yield and fruit quality of pear (<i>Pyrus communis</i> L.) cv. Punjab Beauty

Post-Bloom CPPU Application Is Effective at Improving Fruit Set and Suppressing Coloration but Ineffective at Increasing Fruit Size in Litchi

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