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利用 14 C-同位素示踪技术 ,研究重穗型杂种稻的光合能力和光合产物运转分配特性。结果表明 ,两优培九、 优 16 2、特优 12 4等新近育成的 3个重穗型杂种稻品种光合能力强且光合功能的高值持续期长 ,具备有超高产的潜力。同时 ,两优培九和 优 16 2有较强的耐光抑制能力 ,特优 12 4有一定的耐低光强的能力。但与对照品种汕优 6 3相比较 ,这三个重穗型杂种稻品种光合产物的运转效率差 ,光合稳定性不强。本文提出了进一步增强现有重穗型杂种稻同化物的运转效率和对外界变化光强的光合适应能力是实现水稻超高产育种的可能的生理途径。
The 14 C-isotope tracing technique was used to study the photosynthetic capacity and photosynthetic product turnover and distribution of heavy panicle hybrid rice. The results showed that the newly developed three panicle hybrid rice cultivars, Liangyou Peijiu, You16 2 and Teyou 12 4, had the highest photosynthetic ability and the longer duration of high photosynthetic function with the potential of high yield. At the same time, two excellent Peijiu and excellent 16 2 has a strong ability of light-resistant, excellent 12 4 has a certain ability to resist low light intensity. However, compared with the control variety Shanyou 6 3, the photosynthetic products of these three heavy-panicle hybrid rice varieties had poor operation efficiency and poor photosynthetic stability. In this paper, it is suggested that it is possible to further enhance the operational efficiency of existing heavy panicle hybrid rice assimilates and their photosynthetic adaptability to light intensity of external changes.