Selection of superior plants and breeding of space mutagenesis of Pinus elliottii
In order to shorten the breeding cycle of excellent Pinus elliottii varieties and explore the effectiveness of space mutagenesis breeding of P.elliottii seeds,600 seeds of excellent P.elliottii families 0-1027 of Hunan Maoyuan Forestry Co.Ltd.,were carried onto the"Shenzhou8"spacecraft.After 16 days and a total of 397 hours of space radiation mutagenesis,they were sown and raised together with 600 control seeds.The 268 space mutagenesis seedlings and 358 control seedlings were obtained,and their growth characteristics were investigated and analyzed continuously for 9 years after afforestation.The results showed that in the 9th-year of afforestation,76 plants in the mutagenesis group had a higher individual volume than the average individual volume of the control group,and 12 plants had a higher individual volume than the maximum individual volume of the control group.The 7 excellent variant plants of P.elliottii were selected,with individual volume,diameterat breast height,and tree height increased by 110.5%to 139.4%,28.7%to 41.1%,and 25.7%to 41.5%,compared to the average of the control group,respectively.The highest values of the control group were also increased by 18.9%to 33.9%,2.6%to 12.5%,and 1.1%to 22.7%,compared to the average of the control group,respectively.
Pinus elliottiispace mutagenesisbreedingselection of superior plants
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