木麻黄苗期最佳固氮基因型组合体研究
Study on the Optimum Frankia-genotype Associations of Casuarina Seedlings
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摘要: 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个种源或家系的山地木麻黄)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,且接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种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-0.205~5.072g/株;地下生物量为-0.009~1.324g/株;总生物量为0.101~6.396g/株。Abstract: 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 (P0.05 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.
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Key words:
- Casuarina sp.
- / nitrogen fixation
- / Frankia
- / genotype
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