Studies The Effects On Some Traits Irradiated By γ-Ray To Micro-Edosperm Super-High Oil Corn

Dry seeds of four micro-endosperm super-high oil corn inbred lines and a hybrid were irradiated by differentγ-ray dose,some traits variation were studied on their M₁ and M₂, the results showed:(1) In the used range of irradiation dose, the period of seedling was delayed, seedling survival rate, seedling emergence rate and seedling height were all declined,and the more irradiation dose increased, the more they declined. According to the decline extent of seedling height, the proper irradiation dose to dry seeds of inbred lines from these kinds of corn was about from 120Gy to 180Gy.(2) In M₁, compared with CK,days to tassel,days to pollen and days to silk of 2-45 and 10-21 byγ-ray irradiation were delayed. Days to pollen and days to silk of 9-52 were also delayed. Variance coefficient of three growing period traits in 2-45 byγ-ray irradiation were all declined. Variance coefficient of days to pollen and days to silk in 9-52 and 10-21 were declined,but effects didn't achieve the significant level.In M₂, compared with CK, growing period traits of materials byγ-ray irradiation were generally forworded,and effects achieved the significant level. Variance coefficient was increased,but opposed variance happended in individual materials.(3) In M₁, plant type traits of 4-3-4,9-52,2-45 and 10-21 byγ-ray irradiation were generally inhibited such as seedling height,plant height,ear height,length of ear leaf, width of ear leaf, stem diameter and number of leaves. Variance coefficient was increased.γ-ray irradiation had significant effects on most plant type traits.In M₂, the variation in plant type traits of materials byγ-ray irradiation had no regulation,but some traits were inhibited. Variance coefficient was generally increased.γ-ray irradiation had significant effects on plant type traits of 4-3-4 and 9-52.γ-ray irradiation had significant effects on some plant type traits of 2-45 and 10-21.(4) In M₁,compared with CK, yield traits of 4-3-4, 9-52 , 2-45 and 10-21 byγ-ray irradiation were generally declined such as ear length,ear diameter,kernel row,kernel weight per ear and 100-kernel weight. Variance coefficient of yield traits in 4-3-4 byγ-ray irradiation were delined. Variance coefficient of 9-52 were increased, there is no regulation in 2-45 and 10-21.γ-ray irradiation had significant effects on some yield traits of 9-52,2-45 and 10-21.In M₂, compared with CK,yield traits of 4-3-4 were increased,but there is no regulation in 9-52,2-45 and 10-21.Variance coefficient of yield traits in materials byγ-ray irradiation generally were increased.γ-ray irradiation had significant effects on most yield traits of four materials.(5) In M₁, percent oil and oil weight of 9-52,2-45 and 10-21 were declined byγ-ray irradiation,but variance coefficient of these traits were increased.γ-ray irradiation had significant effects on oil weight of three materials,but had no significant effects on percent oil.In M₂, percent oil and oil weight of materials were declined byγ-ray irradiation,and effects achieved the significant level. Variance coefficient of most percent oil and oil weight in three materials were increased.The results showed thatγ-ray irradiation had different effects, on five materials and their traits. Most traits of materials were extently inhibited in M₁,but recovered extently in M₂.Genetic basis and mutation range were largen. So it was possible to select good germplasm resources in descendants of micro-edosperm super-high oil corn by irradiation.