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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2017, 38 (5)                                     Back

nstantaneous and historical temperature effects on a-pinene

Differential crop load and hormonal applications for enhancing fruit quality and yield attributes of grapes var. Flame Seedless


S. Singh*, N. K. Arora, M.I.S. Gill and K. S. Gill

Department of Fruit Science, Punjab Agricultural University, Ludhiana - 141 004, India

*Corresponding Author E-mail:




Key words

Abscisic acid,

Fruit quality,                               

Pre-harvest treatment, 

Seedless grapes




Publication Data

Paper received : 03.01.2016   

Revised received : 09.05.2016

Re-revised received : 23.08.2016 Accepted : 06.10.2016



Aim: Recently, introduced grape cv. Flame Seedless has uneven berry colour problems under subtropical climatic conditions of northern India.Probably due to high temperature at the time of ripening in subtropical conditions, which inhibit the accumulation of anthocyanins is the major cause of this malady. It is evident that by reducing crop load and application of abscisic acid (ABA) helpful for attainment of uniform and improved quality bunch in grapes. Hence, the present study was conducted to study the combined impact of various levels of crop load and pre-harvest treatments of ABA on fruit quality (uneven colour of berries/bunch, anthocyanin content, yield,berry and bunch weight, total soluble solids (TSS), total sugars and time of ripening) of grapes cv. Flame Seedless.


Methodology: Vines were retained with three levels of crop load thinned at pea stage viz., 50% (50-65 bunches/vine), 75% (80-90 bunches/vine) and 100% (110-120 bunches/vine). These treatments were compounded with three concentrations of ABA (50, 100 and 150 ppm) applied as foliar sprays at veraison stage.


Results: Grape vines with 50% crop load (50-65 bunches/vine) and 150 ppm ABA had better development of berry colour (14.60 % uneven colour of berries/bunch), ripened 4 days earlier, higher anthocyanin content (41.78 mg100 g-1) and bunch weight (375.33 g) as compared to control vines. However, application of 100 ppm ABA at 50% crop load (50-65 bunches/vine) had relatively more berry weight (3.25 g), total sugar content (16.14 %) and TSS (19.15 %). The highest fruit yield (32.60 kg/vine) was recorded with 100% crop load (110-120 bunches/vine) and 100 ppm ABA.


Interpretation: The results of the present study showed that 100 to 150 ppm application of ABA at veraison coupled with low crop load 50% (55-65 bunches/ vine) would be helpful in uniform colouration of bunch with improved fruit quality.



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