Abstract
Even though dry-heat (DH) treatment has been widely used for inactivation of seed-borne virus in vegetable seeds, it is known that the seeds should be used within a year after the DH treatment because of the significant reduction of storage capability in DH-treated seeds. DH-treated seeds exhibited poor early germination and significantly higher percentages of abnormal seedlings produced. The final germination rate was, however, not usually influenced by DH treatment. DH-treated seeds had been stored at 20 °C up to 5 years in sealed containers with silica gel in some cultivars. Both the intact and DH-treated seed exhibited excellent germination even after 4 years of storage at room temperature. Even though the hypocotyl length was shortened in DH treated seeds of most cultivars tested, other characteristics of seedlings produced from intact and or DH-treated seeds were similar. Cultivars showed marked differences in seedling characteristics, especially in length of hypocotyles.
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