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草业学报  2009 

2年生桉树杂交种生长与抗风的遗传变异研究

, PP. 91-97

Keywords: 桉树,杂交种,抗台风,生长,遗传变异

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Abstract:

以2×10的析因交配桉树杂交种为研究材料,杂种的母本为尾叶桉和细叶桉,父本为巨桉、粗皮桉、细叶桉和尾叶桉。对27个月生杂交种的材积生长、抵抗风速为18和40m/s台风的抗风指数(WR1和WR2)的研究表明,材积生长在母本间差异不显著(P>0.05),但在父本间、母本与父本的交互作用间差异显著(P<0.05);WR1在父、母本间均存在显著差异(P<0.05),WR2只在父本间差异显著(P<0.05)。在材积生长上,巨桉作为父本具有高的一般配合力,T1×G2、U1×P3具有高的特殊配合力;在抗风指数上,G1、G2和P2作为父本分别对WR1和WR2具有高的一般配合力。材积生长性状受加性基因和显性基因的控制,狭义和广义遗传力分别为0.14~0.17和0.30~0.36;抗风指数受加性基因控制,遗传力为0.10~0.11。以尾叶桉为母本的子代材积生长性状遗传力高于细叶桉母本的子代、抗风指数的遗传力高于细叶桉母本的子代;材积生长性状与WR1总体上呈显著正相关(P<0.05),与WR2呈显著负相关(P<0.05)。

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