Our aim was to understand how moderately increased light intensities influenced the response of chickpea to high temperature. Three chickpea genotypes (Acc#3, Acc#7 and Acc#8) were treated at control (26 °C and 300 μmol m⁻² s⁻¹ photosynthetic photon flux density/PPFD), high temperature (38 °C and 300 μmol m⁻² s⁻¹ PPFD), increased light intensity (26 °C and 600 μmol m⁻² s⁻¹ PPFD) and combination of increased light and temperature (38 °C and 600 μmol m⁻² s⁻¹ PPFD). The net photosynthetic rate (P_N) of Acc#3 and Acc#8 significantly decreased at high temperature regardless of light intensity. The P_N of all three genotypes at increased light intensity was significantly higher than that at high temperature. The intracellular CO₂ concentration (C_i), stomatal conductance (g_s) and transpiration rate (E) of Acc#3 and Acc#8 at increased light intensity with or without high temperature significantly decreased in comparison with control and individually high temperature treatment. The relative water content of Acc#3 at high temperature and the combination treatment decreased as compared with control. The relative water content of Acc#7 at control was higher than the other three treatments. The F_v/F_m (Maximum quantum efficiency of photosystem II) of leaves from the three genotypes at 38 °C were lower than at 26 °C regardless of light intensity. The high temperature decreased chlorophyll content in the lower bottom leaf of Acc#7 and Acc#8 than control. In conclusion, chickpeas showed a higher net photosynthetic rate at increased light intensity to withstand heat stress, which was genotype-dependent. Physiological responses of different chickpea genotypes to increased temperature and light intensity indicated that distinct responsive mechanism of photosynthesis. This study provides information on how chickpea respond to high temperature and increased light intensity, which will help us to improve chickpea to deal with future climate changes.

我们的目的是了解适度增加的光强度如何影响鹰嘴豆对高温的响应。在对照（26°C和300μmolm ^-2 s ^-1光合光子通量密度/ PPFD），高温（38°C和300μmol）下处理了三种鹰嘴豆基因型（Acc＃3，Acc＃7和Acc＃8）m ^-2 s ^-1 PPFD），增加的光强度（26°C和600μmolm ^-2 s ^-1 PPFD）和增加的光和温度（38°C和600μmolm ^-2 s ^-1 PPFD）的组合。净光合速率（P _Ñ度Acc＃3和ACC。＃8）在高温下降低显著光强度无关。的P _Ñ在增加的光强度的所有三个基因型的比在高温下显著更高。与对照和单独高温处理相比，在有或没有高温的情况下，Acc＃3和Acc＃8在增加的光强度下，细胞内CO ₂浓度（C _i），气孔导度（g _s）和蒸腾速率（E）均显着降低。 。与对照相比，Acc＃3在高温和联合处理下的相对含水量降低。对照中Acc＃7的相对含水量高于其他三种处理。F _v / F _m三种基因型的叶片（光系统II的最大量子效率）在38°C时均低于26°C，而与光强度无关。高温使Acc＃7和Acc＃8的下部底部叶片的叶绿素含量比对照降低。总之，鹰嘴豆表现出较高的净光合速率，其光强度增加以承受热胁迫，这是基因型依赖性的。不同鹰嘴豆基因型对温度升高和光照强度的生理响应表明光合作用的响应机制不同。这项研究提供了有关鹰嘴豆如何应对高温和增加光强度的信息，这将有助于我们改进鹰嘴豆以应对未来的气候变化。