Journal
JOURNAL OF INTEGRATIVE PLANT BIOLOGY
Volume 47, Issue 2, Pages 187-193Publisher
WILEY
DOI: 10.1111/j.1744-7909.2005.00031.x
Keywords
germination; indica rice; japonica rice; seedling vigor; thermal hardening
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In a laboratory study, indica andjaponica rice (Oryza sativa L.) seeds were exposed to thermal hardening (heating followed by chilling followed by heating; chilling followed by heating followed by chilling; heating followed by chilling or chilling followed by heating). In indica rice, heating followed by chilling followed by heating resulted in decreased mean germination time, time to start germination, electrical conductivity of seed leachates, and time to 50% germination, as well as increased germination index, energy of germination, radicle and plumule length, root length, root/shoot ratio, root fresh and dry weight, radicle and plumule growth rate, and shoot fresh weight. In japonica rice, chilling followed by heating followed by chilling performed better than all other treatments, including control.
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