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利用不同磷效率基因型大豆品种,采用盆栽控制磷供应量,探讨其同化物积累及光合生理特性与产量性状的差异。结果表明:磷高效品种在低高磷处理下,相对干物质量比较高,能达0.9左右,而磷低效品种多在0.6左右;在低磷处理下,磷高效品种的净光合速率Pn均大于高磷处理,磷低效品种则小于高磷处理;高磷处理使气孔导度Cond、胞间CO2浓度(C i)、蒸腾速率(Tr)增加;低磷处理加强大豆叶片水分利用率(WUE);磷高效品种低高磷处理下产量比在0.9左右,磷低效品种仅为0.62。因此,可以将低高磷下干物质量比和产量比作为筛选不同磷效率基因型大豆的指标。
Using different phosphorus efficiency genotypes of soybean varieties, the use of potted plants to control phosphorus supply to explore the accumulation of its assimilate and photosynthetic physiological characteristics and yield traits differences. The results showed that under the condition of low-high-phosphorus treatment, the phosphorus-efficient varieties had higher relative dry matter mass, reaching about 0.9, while the phosphorus-inefficient cultivars were mostly around 0.6. Under low-phosphorus treatments, the net photosynthetic rate Pn of high- High Phosphorus treatment was less effective than High Phosphorus treatment on phosphorus deficiency; High Phosphorus treatment increased the stomatal Cond, C i and Tr; Low Phosphorus treatment enhanced the water use efficiency of WUE ). The yield of phosphorus-efficient varieties under low-high-phosphorus treatments was about 0.9, while that of phosphorus-inefficient varieties was only 0.62. Therefore, the ratio of dry matter mass and yield at low P can be used as an index to screen soybean with different P efficiency.