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采用低磷红壤盆栽试验方法 ,对原产广东省大豆基因型的冠部、根部磷效率特性及其与植株磷效率特性的关系进行研究。结果表明 ,与常磷水平相比 ,在低磷胁迫下 ,大豆基因型根部干重占植株干重的百分率相对提高 ,即具有较大的根 /冠比 ;大多数大豆基因型冠部的磷素积累相对较多 ;RVPPER(植株磷效率比值相对值 [1 ] )越大的基因型 ,其冠部磷素吸收率就越大 ,反之亦然。另外 ,大豆基因型根部磷素积累特性与冠部磷素积累特性有所不同。在低磷胁迫下 ,随着 RVPPER增大 ,除了 HND39外 ,其他大豆基因型的冠部磷效率比值( SPER)和根部磷效率比值 ( RPER)均呈现逐渐增大的趋势 ;除了 HND 0 8、33、39、57、93、94大豆基因型外 ,其他大豆基因型的根部磷效率比值大于冠部磷效率比值。相关分析表明 :低磷水平下的冠部磷素吸收量可以简便有效地衡量大豆基因型植株磷效率特性 ,是育种实践中可采用的理想指标。
Phosphorus efficiency characteristics of crown and root of soybean genotypes originating in Guangdong Province and its relationship with phosphorus efficiency characteristics were studied by low phosphorus red soil pot experiment. The results showed that under low P stress, the percentage of root dry weight of the soybean genotype to the dry weight of the plant increased relative to that of the normal phosphorus, that is, the root / shoot ratio of the soybean genotype was the highest. There is a relatively high accumulation of primes; the greater the genotype of RVPPER (relative value of plant P efficiency ratio), the greater the crown phosphorus uptake and vice versa. In addition, the accumulation of phosphorus at the roots of soybean genotypes differed from that at the crown. Under low P stress, with the increase of RVPPER, except for HND39, the SPER and RPER of other soybean genotypes tended to increase gradually; except HND 0 8, 33,39,57,93,94 soybean genotypes, the other genotypes of soybean root phosphorus efficiency ratio is greater than the ratio of crown phosphorus efficiency. Correlation analysis showed that the phosphorus uptake by the crown at low phosphorus level could be used to measure the phosphorus efficiency of soybean genotypes conveniently and effectively, which is an ideal index that can be used in breeding practice.