INDUCTION OF SEED DORMANCY AND ITS IMPACT ON SEED QUALITY IN GROUNDNUT (Arachis hypogaea L.)
Loading...
Date
2022-01-20
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Agricultural Sciences, Bangalore
Abstract
Field and laboratory experiments were conducted to induce dormancy in non-dormant groundnut variety GKVK-5 by foliar spraying of different dormancy inducing chemicals of various concentrations viz., maleic hydrazide @ 1250, 1500 ppm, abscisic acid @ 100, 200 ppm and cycocel @ 2000, 3000 ppm at 85 DAS during kharif 2020. The results revealed that there was a significant difference between the treatments of which the highest germination (82.00 %) was recorded from control while, the least germination (28.66 %) was recorded from maleic hydrazide @ 1500 ppm immediately after harvest. Thus, the spray of dormancy inducing chemicals protect the seed from in situ germination due to rains at the time of harvest without affecting growth and yield parameters.
The dissipation of dormancy was studied both in field and laboratory condition by harvesting only half of the plot in each treatment at physiological maturity. The plots with retained plants were maintained at field capacity to study the dissipation in field condition and it was found that the seeds from dormancy induced plots showed dormancy of upto 8 to 12 days whereas, the seeds from control showed a dormancy period of mere 1 to 2 days. The seeds that were harvested were put to germination test to study the dissipation of dormancy in lab condition and it was recorded that germination of 74.66 and 75.33 per cent from MH @ 1500 ppm and cycocel @ 3000 ppm respectively on 16 DAH. Whereas, the control was recorded 82.00 per cent germination immediately after harvest.
The harvested seeds from each of the plot was carried forward to break the dormancy with different dormancy breaking chemicals at various concentrations viz., KNO3 @ 0.4, 0.6 %, GA3 @ 250, 500 ppm, Ethrel @ 250, 500 ppm, hydration and dehydration along with control. It was recorded that GA3 @ 500 ppm recorded the highest germination (98.83%) followed by hydration and dehydration. Whereas, the lowest germination (28.66 %) was recorded from control.