不同强光处理时长对大豆气孔性状及光合响应强光的影响
- Title:
- Influence of Different Durations of High Light Treatment on Soybean Stomatal Traits and Photosynthetic Response to High Light
- 摘要:
- 为明确不同耐荫性大豆的气孔和光合性状对强光时长的响应，选用耐荫性弱的桂夏7号和耐荫性强的南豆12为试验材料，设置午间强光的光合光子通量密度（Photosynthetic Photon Flux Density，PPFD）为1 200 μmol·m-2·s-1、时长分别为30，150和200 min（L1~L3处理），其余时段PPFD为150 μmol·m-2·s-1，以全天稳定光强（400 μmol·m-2·s-1）为对照（CK），分析不同光照处理对大豆的光合特性、气孔性状、气孔诱导速率和光合诱导速率的影响。结果表明：增加午间强光时长有利于提高大豆叶片的光合能力，桂夏7号和南豆12处理L3的最大净光合速率比L1分别显著升高88.58%和9.61%；适度增加午间强光时长有利于增加大豆叶片初始气孔导度和气孔诱导速率，大豆叶片初始气孔导度和气孔诱导速率均与光合诱导速率呈显著正相关，因此适度增加午间强光时长有利于增加大豆叶片的光合诱导速率；同时，与稳定光处理相比，变化光强处理下大豆光合诱导速率更快，南豆12中L1、L2和L3处理下光合诱导速率分别比CK显著升高36.34%、45.45%和9.05%。说明适当增加午间光照时长更有利于增强大豆的光合能力、初始气孔导度和气孔诱导速率，从而增加大豆的光合诱导速率，促进CO2固定。研究结果可为提高带状复合种植模式下大豆光合诱导速率提供理论支撑。
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