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Ethephon Effect on Peanut Seed Dormancy Release
Papassorn Wattanakulpakin, Kantima Thongsri and Supalak Sattayasamitsathit
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DOI:10.17265/2161-6264/2022.02.003
Phitsanulok Seed Research and Development Center, Department of Agriculture, 813 Moo. 8, Wangthong District, Phitsanulok 65130, Thailand
Dormancy is undesirable character for the peanut seed (Arachis hypogeae). KK 84-7 and KK 6 varieties are characterized to the Virginia type and its dormant period has been one to two months after harvest. The recommendation for breaking peanut seed dormancy by the International Seed Testing Association (ISTA) rules is preheat at 40 °C up to 168 h. The total germination test is 17 d, if breaking dormant seed is required. Effect of ethephon on peanut seed dormancy release was studied in this experiment to reduce the analysis time compared to preheat method. Both varieties of peanut seeds were directly mixed with 0.96% ethephon and preheated at 40 °C for 168 h. Standard germinations were conducted for all treated and untreated seeds. Ethephon was the most beneficial to release dormant seed at fresh harvest that achieved 86% and 84% normal seedlings for KK 84-7 and KK 6, respectively. The normal seedlings of preheat treatment showed 75% for KK 84-7, and 66% for KK 6. Only 6% normal seedlings were observed in untreated seeds of KK 84-7 and 56% of KK 6. After storage at 20 °C for 28 d, KK 84-7 had over 90% normal seedlings with both ethephon and preheat methods, but only 42% germination was observed in untreated seeds. In KK 6, the highest germination by 90% was found in ethephon, followed by untreated and preheated seeds that were 87% and 83%, respectively. The paired t test of normal seedlings between ethephon and preheat treatments demonstrated that the greater average germination was found in ethephon method for both varieties. This research suggests that ethephon is the advantageous method for breaking peanut seed dormancy. The germination test duration is more rapid, only 10 d, since preheat for 168 h is not necessary.
Peanut seed, dormancy, ethephon.
Wattanakulpakin, P., Thongsri, K. and Sattayasamitsathit, S. 2022. "Ethephon Effect on Peanut Seed Dormancy Release." Journal of Agricultural Science and Technology B 12 (2022): 48-54.
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