以超高产或高产栽培稻两优培九、汕优63、威优46和93-11为对照，测定了湖南茶陵普通野生稻抽穗开花期1 d中不同时间点的净光合速率（Pn）以及Pn对不同光强、不同CO2浓度与不同温度的响应曲线。结果表明，茶陵普通野生稻的Pn在下午极显著高于对照，在高温（40℃，45℃）胁迫下也是如此；光补偿点为22.3 µmol photons m-2 s-1，与对照差异不显著(20.1~23.7 µmol photons m-2 s-1)，光饱和点为1 810 µmol photons m-2 s-1，与对照93-11无显著差异，但极显著高于其他对照材料（1 530~1 628 µmol photons m-2 s-1），表观量子效率(AQY)与对照无显著差异；CO2补偿点（52.7 μmol mol-1）稍高于对照（42.7~50.1 μmol mol-1），而饱和点(644.5 μmol mol-1)则明显高于对照(521.1~581.3 μmol mol-1)，羧化效率（0.1511 mol m-2 s-1）显著高于对照(0.1277~0.1384 mol m-2 s-1)；叶绿素含量极显著高于对照。说明茶陵普通野生稻的光合性能强于超高产或高产对照栽培稻，且在高温下表现更为突出。
Chaling wild rice, one of groups of common wild rice (Oryza rufipogon Griff), was found in Chaling county, Hunan province, and has not been studied on its photosynthesis at home and abroad. The objective of this study was to measure the photosynthetic parameters of flag leaves at flowering stage using Chaling wild rice with several super-high yielding or high-yielding rice cultivars (Liangyoupeijiu, Shanyou 63, V46, and 93-11) as controls. The net photosynthetic rate (Pn) of rice flag leaves was measured with the LI-6400 Portable Photosynthesis System from 9:00 to 17:00 at sunny day under natural condition. The response of Pn to light intensity was measured from 9:00 knowledge of photosynthesis of wild rice to 11:00 at sunny day under different light intensities of red-blue light provided by the LI-6400 machine. The responses of Pn to CO2 concentration and temperature were measured from 9:00 to 11:00 at sunny day under different CO2 concentrations and different temperatures respectively, as well as 1 500 µmol photons m-2 s-1 of stable red-blue light provided by the LI-6400 machine. Photosynthetic pigment contents were measured by 7230G spectrophotometer. The results showed that the Pn of Chaling wild rice was much significently higher than that of cultivars in the afternoon and under high temperature (40℃ and 45℃). The light saturation point (LSP) of Chaling wild rice was 1 810 µmol photons·m-2·s-1, which was much significantly higher than that of cultivars (1 530–1 628 µmol photons m-2 s-1) except 93-11, and the light compensation point (LCP) of Chaling wild rice was 22.3 µmol photons m-2 s-1, without significant difference with that of cultivars (20.1–23.7 µmol photons m-2 s-1). There was no significant difference of AQY between Chaling wild rice and cultivars. The carboxylation efficiency (CE) and CO2 saturation point of Chaling wild rice were 0.1511 mol m-2 s-1 and 644.5 μmol mol-1 respectively, significantly higher than those of cultivars (0.1277–0.1384 mol m-2 s-1 and 521.1–581.3 μmol mol-1 respectively), and its CO2 compensation point (52.7 μmol mol-1) was a little higher than that of cultivars (42.7–50.1 μmol mol-1). The chlorophyll content of Chaling wild rice was much significantly higher than that of cultivars. Based on the above results we think that the photosynthetic capacity of Chaling wild rice is stronger than that of super-high yielding or high yielding cultivar controls , especially under high temperature.
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