摘要
研究了12个甘蔗基因型的蔗茎糖分及一些生理生化性状的遗传和相关。结果表明,除蔗糖分外,所研究的生理生化性状遗传参数均较小.生理生化性状中,比叶重和蛋白质的广义遗传力最大,光合产物转移速率和多酚氧化酶遗传力最小;而相对遗传进度则叶绿素总量和抗坏血酸氧化酶最大,光合强度和中性转化酶最小;相关分析表明蛋白质、中性转化酶和比叶重分别与蔗糖分呈正遗传相关;其余为负遗传相关。通径分析结果:比叶重、光合强度、中性转化酶和多酚氧化酶分别对蔗糖分的直接贡献最大。育种上通过对上述4个性状的改良和选择,有可能提高甘蔗基因型的蔗茎糖分。
The heredity and correlation among sucrose content of cane and some physiological-biochemical characters in sugarcane genotypes had been studied. The results showed that all genetic parameters of physiological- biochemical characters were smaller except sucrose content of cane. A-mong the physiological-biochemical characters, both broad heritability(h2%) of the dry weight/dm2 of leaf area and prolien content of leaf were the highest, and the h2 % of the transport rate of photo-synthate and the activity of polyphenol oxidase were the lowest. The chlorophyll content of leaf and the Vitamin C oxidase had the highest values of relative genetic gain (ΔG' % ). The ΔG' % of the photosynthesis efficiency and the activity of neutral invertase were the lowest. The results of correlation analysis indicated that there were positive genetic correlations among the sucrose content of cane and the protient content of leaf , the dry weight/dm2 of leaf area and activity of neutral invertase. There were negative genetic correlations among the other characters. The path analysis showed that the four characters, dry weight/dm2 of leaf area, photosynthesis efficiency, activity of neutral invertase and polyphenol oxidase, had the biggest contribution to the sucrose content of cane. Through improving and selecting the four characters mentioned above, it would be possible to improve the sucrose content of cane in sugarcane genotypes.
出处
《华南农业大学学报》
CAS
CSCD
1993年第4期1-7,共7页
Journal of South China Agricultural University
基金
国家自然科学基金
关键词
甘蔗
基因型
蔗糖分
遗传
Sugarcane
Genotypes
Sucrose content of cane
Physiological-biochemical charaters
Heredity
