Preliminary study on the nature of seed dormancy and overcoming method in large-seeded groundnut
1988
Juangjun Duangpatra | Chokchai Kittitanasuan (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
In 1987, the nature of seed dormancy and dormancy release in large-seeded groundnut were determined in two promising groundnut lines, KUP24D-421 and KUP24D-165. Freshly hand harvested groundnut pods were depodded by hand and tested for germination and dormancy on the next day after harvest. Harvested pods were sun dried and artificially sack dried immediately after harvest. Seed moisture content decreased to about 9 % when the sun dried and artificially dried seeds were determined for germinability and dormancy. Dried seeds were left in shell and put in the local ambiant storage for two months during October to November, then were sampled out again for germination test. Freshly harvested seeds of KUP24D-421 contained higher percentage of dormant seeds than KUP24D-615. Dormancy releasing was found during artificial drying in KUP24D-615 but drying did not show any effect in KUP24D-421. No difference in dormancy was observed in fully mature apical seeds and basal seeds in KUP24D-421 groundnut, neither the difference in seed dormancy in different maturity groups of KUP24D-421 artificially dried seeds. However, fully mature seeds of KUP24D-615 contained less numbers of dormant seeds than the immature and intermediate groups. Apical seeds in KUP24D-615 groundnut also contained less numbers of dormant seeds than the basal seeds. Seed dormancy in KUP24D-421 and KUP24D-615 was completely released within three months after harvest under local climate. keeping pre-treated shelled KUP24D-421 groundnut seeds at 50 deg. Celsius for 72 hours was the most effective method in overcoming seed dormancy.
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