تاثیر تیمار دمایی بر فرآیند جوانه زنی ارقام برنج

In order to study of temperature treatment on germination process of rice varieties, a greenhouse experiment was carried out in deputy of rice research institute of Iran (Amol). Temperature as main factor with 10, 14, 32 oc and duration of cold stress with 12, 24 , 48 h as sub-factor, and Tarom mahali, Domsia, Nemat, Gardeh, and Onda varieties as sub-sub factors were been. With decreasing of temperature from 32 to 14 and 10 oc, the characters of percent and rate germination, length of radicle and jumule , dry and wet weight of radicle and jumule were significantly decreased, however, percent of seed damage was increased. The amount of decreasing of percent and rate of germination in 10 and 14 oc was 6-10 percent compared to 32oc but others characters were decreased 50 – 80 percent. The Onda variety was more tolerance and Domsia variety more sensitive to cold stress.