Efficacy of Plant Growth Regulators on Fruit Developmental Disorder of Ber cv. Thai Apple
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
Studies were carried out to evaluate the “Efficacy of Plant Growth Regulators on Fruit Developmental Disorder of Ber cv. Thai Apple”
at the Fruit Research Farm of Department of Fruit Science and laboratories of Department of
Botany, Punjab Agricultural University, Ludhiana during the years 2019-20. Two foliar
applications of NAA (10ppm and 20ppm), GA3 (10ppm and 20ppm) and CPPU (5 ppm and
10 ppm), first during 3rd week of October and second one month after the first application
were given to the ber cultivars Thai apple and Umran, keeping unsprayed trees as control.
The developmental studies were made at periodic interval, i.e. 15 DAFS till 180 DAFS stage
for Umran and 30 DAFS till 105 DAFS for Thai Apple. At all the stages of development, the
fruit weight, length, breadth and pulp weight was maximum with the application of 20 ppm
NAA which was statistically higher than the control fruits in ber cv. Thai Apple. While in
Umran, maximum fruit weight, length, breadth and pulp weight was attained with 20 ppm
GA3. The stone weight and size increased from the initial stage till 70 DAFS and then
decreased till maturity due to the developmental disorder in untreated trees of Thai Apple.
The maximum stone weight, stone length and breadth was recorded with NAA (20 ppm)
which was statistically higher than the control in ber cv. Thai Apple. While in Umran,
maximum stone length, breadth and weight was observed with 20 ppm GA3. The ber cv.
Umran fruit does not have the development disorder in the form of pit splitting, hence it was
used as a check variety to compare the differences with ber cv Thai Apple which has pit split
disorder. There was 96.66% pit splitting in fruits of untreated trees of Thai Apple, with
maximum reduction in splitting with NAA (20 ppm) followed by GA3 (20 ppm). There were
large irregular shaped hollow cavities in the mesocarp of fruits of untreated trees of Thai
Apple, while no such hollow cavities were seen in the foliar treated fruits of Thai Apple.
Therefore two foliar applications of 20 ppm NAA, first during the 3rd week of October i.e., at
peak flowering stage followed by second spray after one month resulted in reduction of pit
splitting to 30 per cent against untreated control in ber cv. Thai Apple which is attributed to
the cell enlargement caused by the synthetic auxin NAA
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Citation
Yadav, Himal (2021). Efficacy of Plant Growth Regulators on Fruit Developmental Disorder of Ber cv. Thai Apple (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.