木麻黄苗期最佳固氮基因型组合体研究

在野外苗圃中，对放线菌Ｆ２８７与不同基因型苗（１４个种源的普通木麻黄和１０个种源和家系的山地木麻黄）组合的研究表明，在生长和生物量指标上，参试苗木的基因型间存在着显著或极显著差异，且按种与未接种处理间也存在着显著或极显著差异；接种后形成的２４固氮基因型组合体的各指标增量平均值变化非常大；根瘤数为０．３－８．９个／株；苗高为－２．１－４０．３ｃｍ；地径为－０．０４－０．１８ｃｍ；地上生物量为－０．２

Study on the Optimum Frankia-genotype Associations of Casuarina Seedlings

In field nursery, an experiment was carried out with a Fran-kia F287 strain and seedlings from 24 different seedlots of genotypes--14provenances of Casuarina equisetifolia and 10 C. junghuhniana. The results showed that there were significant differences (P<0.05 or 0.01) among genotypes, and between inoculation and non-inoculation treatments in growth and biomass production. The increment mean values of 24 Frankia-genotype associations in nodule numbers, growth and biomass production of seedlings were also obviously fluctuating, root nodule numbers 0.3~8.9/plant;seedlings heights -2.1-40.3 cm; diameters at ground level - 0.01~0.18 cm; biomass above ground (stem, shoot and leaf) -0.205~5.072 g/plant; biomass under ground (roots and nodules) -0.009~1.324 g/plant; total biomass -0.101~6.396 g/plant. This indicated that nitrogen fixation capabilities of different genotypes provenances and families of Casuarina species are genetically variable. Finally,by the Multiple Objective Strategic Decision Analysis methods, 24 Frankia-genotype associations were optimized and ordered, and some optimum associations were found out.