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以杂交稻组合品种 (以下简称品种 )汕优 6 3和两优培九为材料 ,测定了光合速率 ,PS 光化学活性 ,活性氧代谢 ,1 4 CO2 同化产物分配的指标。结果显示 :在生育后期 ,与汕优 6 3相比 ,两优培九在不同光强下具有较高的光合能力 ;在逆境条件下 ,原初光化学效率 (Fv/Fm)的下降及 O·2 产生速率和 MDA含量增长相对较少 ,表明其具有较强的耐光抑制光氧化能力 ;通过用同位素 1 4 C对光合同化产物运转分配进行研究 ,发现两优培九光合同化产物向穗部的运转速率和分配比率均较高 ,表明其具有较好的源库协调性。上述有关光合和同化产物的分配特点可能是超级稻高产的生理基础
The indexes of photosynthetic rate, PS photochemical activity, active oxygen metabolism and the distribution of 1 4 CO 2 assimilation products were measured using hybrid rice combination varieties (Shanyou 63 and Liangyoupeijiu) as materials. The results showed that, compared with Shanyou 63, Liangyoupeijiu had higher photosynthetic ability under different light intensities in late growth period. Under the adverse conditions, the decrease of initial photochemical efficiency (Fv / Fm) and O 2 production rate MDA content increased relatively less, indicating that it has a strong light-resistant ability to inhibit photooxidation; by isotopes of 14 C light assimilation product run distribution studies have found that Liangyoupeiju photo-assimilation products to the spike rate of operation and the distribution ratio Are higher, indicating that it has a good source library coordination. The above-mentioned distribution of photosynthetic and assimilation products may be the physiological basis of super high yield