Screening Of Cold Resistant Agent For Rice In Hunan Province

Cold resistant agent in rice can improve the ability of resisting low temperature. The experiments aim at screening effective cold resistant agent, thus improving output and quality in rice. In this research, different kind of cold resistant agent acting on two early season rice-jinyou974 and lulianyou996-are used to compare to each other in germination potential, germination percentage, single root amount, dry weight and fresh weight per 100 samples. It is compared under three conditions:8-10℃low-temperature treatment after accelerating germination and after one heart with two leaves, normal temperature treatment. The result comes out as follow:(1) In 9 single agents such as salicylic acid, calcium chloride, Uniconazole (20mg/L) and A168 suspension are two of the most effective agent towards the two kind of rice in germination potential, germination percentage, single root amount, dry weight and fresh weight per 100 samples under three different conditions. After accelerating germination,8-10℃low-temperature treatment can lead germination potential and germination percentage to more than 61.5% and 95.3%,single root amount above 3.7,dry weight and fresh weight per 100 samples above 5.74g and 2.11g separately. After one heart with two leaves,8-10℃low-temperature treatment can lead germination potential and germination percentage to more than 97.1% and 96.2%,single root amount above 10.2,dry weight and fresh weight per 100 samples above 7.65g and 1.94g separately. After normal temperature treatment can lead germination potential and germination percentage to more than 97.5% and 96.4%,single root amount above 10.1 dry weight and fresh weight per 100 samples above 8.72g and 1.91g separately.(2) According to the single agent screening result, Uniconazole(20mg/L) and A168 suspension are used to made mixed agent in different ratios in comparison under 3 conditions as well as the single agent. It shows that the ratios 6:4 and 8:2 of A168 suspension and Uniconazole are two of the most effective mixed agent. After accelerating germination,8-10℃low-temperature treatment can lead germination potential and germination percentage to more than 60.3% and 60.1%,single root amount above 3.4,dry weight and fresh weight per 100 samples above 5.61g and 2.11g separately. After one heart with two leaves,8-10℃low-temperature treatment can lead germination potential and germination percentage to more than 88.9% and 90.1%,single root amount above 9.9,dry weight and fresh weight per 100 samples above 7.49g and 1.93g separately. After normal temperature treatment can lead germination potential and germination percentage to more than 90.3% and 90.3%,single root amount above 9.7,dry weight and fresh weight per 100 samples above 8.59g and 1.91 g separately.