Gene flow between introduced and native Eucalyptus species:: Morphological analysis of Tri-species and backcross hybrids involving E-nitens
Gene flow between introduced and native Eucalyptus species:: Morphological analysis of Tri-species and backcross hybrids involving E-nitens
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DOI：
10.1515/sg-2007-0019
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发表时间：
2007-01-01
期刊：
影响因子：
1
通讯作者：
Vaillancourt, R. E.
中科院分区：
文献类型：
--
作者：
Barbour, R. C.;Potts, B. M.;Vaillancourt, R. E.
对桉树第二代三种杂种和回交后代进行了形态计量学分析。这些杂种都是用两个E.羊毛毡苔x cordata F-1、杂种和控制授粉技术。用E. gunnii、古尼氏E. ovata和E. viminalis为母本，而回交用E.心脏苗期性状的多因素分析表明，80%的回交后代属于E.心脏三种杂种的三个杂交组合均偏向E。nitens和向母本和E.心脏在目前的工作中，包括纯亲本物种之间的第一代（F-1）杂交种的数据表明，与第二代杂交种相比，F-1很容易与纯物种区分开来。因此，使用形态学来检测涉及外来种植园物种和本地真核生物种群的第二代杂交是不可靠的，并确定了防止第二代杂交种在野外建立的需要。然而，目前的工作，提供了进一步的证明Fi杂种的形态鉴定的有效性。F-1杂交种的容易识别将有助于识别有外来基因流风险的位点和物种，并使除草程序的发展，重点是在野外消除外来杂交种。
Morphometric analyses were conducted on second-generation tri-species and backcross hybrids in Eucalyptus. These hybrids were all produced using pollen from two E. nitens x cordata F-1, hybrids and controlled pollination techniques. Tri-species hybrids were created with E. gunnii, E. ovata and E. viminalis as females, while backcrosses were produced with E. cordata. Multivariate analysis of seedling characteristics indicated that eighty percent of the backcross hybrids fell within the morphological range of E. cordata. All three cross combinations of the tri-species hybrids were biased away from E. nitens and towards their maternal parent and E. cordata. The inclusion of data for first-generation (F-1) hybrids between the pure parental species in the current work showed the F-1's to be easily distinguishable from pure species, compared to second-generation hybrids. The use of morphology for detecting second-generation hybridisation involving exotic plantation species and native eucalypt populations will therefore be unreliable, and identifies a need for preventing second-generation hybrids from establish in the wild. The current work, nevertheless, provides further demonstration of the effectiveness of morphological identification of Fi hybrids. The easy recognition of F-1 hybrids will be useful in identifying sites and species at risk of exotic gene flow and enable the development of weeding programs that focus on removing exotic hybrids in the wild.