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Germination Characteristics and Salt Tolerance Evaluation of Japonica Rice Seeds Under Salt Stress
2018, 24(1):
28-32.
DOI: 10.3969/j.issn.1006-8082.2018.01.007
In order to explore the salt resistance of japonica rice varieties, a field experiment was carried out to study the effects of salt stress with different concentrations （0, 50, 100, 150, 200, 250 mmol/L） on seed germination and seeding growth of thirteen japonica rice varieties that widely planted in Ningxia, and screen the japonica rice varieties suitable for growing in saline soils. The results showed that the germination of rice seeds was inhibited by salt stress, and the inhibiting effect was enhanced with the increaseing of salt concentration. The germination rate, bud length, main-root length, number of roots were decreased with the increasing of salt concentration． The germination rate was obviously inhibited by high concentration of salt solution （250 mmol/L）, and the germination rate, bud length, main-root length, number of roots were decreased by 44.8%, 86.2%, 86.6% and 83.8%, respectively. However, the four characters didn’t show obvious decrease under lower salt concentration （50, 100 mmol/L）, and inversely they were increased in some combinations. Moreover, salt tolerance of these combinations was evaluated by the relative damage rate. Finally, Jingning 7, Ninggeng 28, Ninggeng 43, Ninggeng 45, Ninggeng 48 and Ninggeng 41 were screened out as salt tolerance rice.
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