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为了探讨金荞麦变异株系在快速生长期的光响应和光合日变化规律,培育新种质,以Co60γ辐照绿茎金荞麦根茎(对照)及得到的红茎、红叶诱变株系植株为试验材料,利用Li-6400便携式光合测定仪连续2年进行了光合参数测定。结果表明:红叶和红茎株系在弱光下具有较好的光利用能力,而绿茎株系在强光下具有较强的光合作用能力;3种金荞麦的净光合速率日变化均呈双峰曲线,由于气孔限制的影响,具有“光合午休”现象;日光合进程中,绿茎的光合速率高于红茎和红叶;光照和温度是影响金荞麦光合作用的主要影响因素,红茎的光合作用需要高大气CO2浓度,而高的大气CO2浓度却抑制了绿茎和红叶的光合作用,低湿也是影响红叶光合作用的重要因子。研究结果说明金荞麦变异株系的光合能力明显弱于绿茎对照植株。
In order to investigate the light response and photosynthetic diurnal variation of Fagopyrum tataricum var. Chinensis var. Tibetanum in rapid growth stage, a new germplasm was cultivated with Co60γ to irradiate the rhizome of Fagopyrum stoloniferum (control) Test materials, the use of Li-6400 portable photosynthetic analyzer for two consecutive years measured photosynthetic parameters. The results showed that the leaves and red stems had better photosynthetic ability under low light, while the light stems and green stems had stronger photosynthesis ability under light. The diurnal changes of net photosynthesis rate of the three kinds of buckwheat The bimodal curve has the phenomenon of “midday depression” due to stomatal limitation. The photosynthetic rate of green stem is higher than that of red stem and red leaf during the photosynthesis process. The light and temperature are the main influencing factors of photosynthesis, Red stem photosynthesis requires high atmospheric CO2 concentration, while high atmospheric CO2 concentration inhibits the photosynthesis of green stems and leaves, and low humidity is also an important factor affecting the photosynthesis of red leaves. The results showed that the photosynthetic capacity of variant strains of F buckle was significantly weaker than that of the control plants of green stems.