离子注入对桉树萌发及苗期生长的影响

Effects of Implanted Ion Beam on Germination and Seedling Growth of Eucalyptus Families

对6个尾叶桉和巨桉的全同胞和半同胞家系进行种子离子注入后，观察萌发和苗期生长，结果表明：（1）离子注入对种子发芽有刺激作用，既促进也抑制；（2）离子注入促进树高和侧根数生长，而抑制地径、叶长、叶宽和根生长，表明通过注入有可能获得生产中所需要的目的性状或品种；（3）离子注入的各家系平均生物量低于对照，但差异不显著；离子注入的家系平均叶比重、叶体积、叶肉体积和叶含水量均低于对照；（4）按突变临界值筛选，离子注入苗中共33株入选，突变率为5．323％；按各家系分别筛选，突变率在7．50％～30．00％．

A germinating and seedling-growing test for 6 full and half sib families of Eucalyptus was conducted, in which N^＋ions were implanted into their seeds. The results indicate that （1） the germinating quality and energy of seeds was affected compared with that of CK; （2） the growth of height and quantity of the thin root of seedlings was enhanced but the growth of root-diameter, leaf-length, leaf-width and root-length was restrained, and the target-properties （varieties） are able to be acquired by ion implantation; （3） the average weight of biomass （g）, leaf-density （mg/mm^3）, leaf volume（mm^3）, leaf-embedded volume （mm^3） and the water quantity of leaf （%） are all lower than those of CK; and （4） according to critical mutation values, 33 mutation-seedlings are selected from the ion-implanted families and 18 elite seedlings from CK ones; the range of mutation-ratio by family selection is 7.50 %-30.00 % and the total mutation-ratio in 6 families is 5. 323%.