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本文以水稻品种越富、旱稻品种IRAT109、导入系IL392为材料,PEG胁迫处理后3个材料叶片蒸腾速率、气孔导度、胞间CO_2浓度和净光合速率曲折下降。IRAT109胞间CO_2浓度始终保持在一个较高的水平,随着干旱胁迫时间的延长,旱稻IRAT109和旱稻导入系IL392的蒸腾速率和气孔导度显著高于水稻YueFu,表明旱稻比水稻具有更强的抗旱性。PEG胁迫处理后3个材料的叶片实际光化学量子效率、光化学淬灭系数、相对电子传递速率都降低,热耗散增加。旱稻叶片实际光化学量子效率、光化学淬灭系数、相对电子传递速率下降的时间和幅度都较水稻和导入系更早、更大,进一步表明旱稻对瞬时干旱能做出更快的响应。
In this study, the richer rice varieties, IRAT109 and IL392, were used as materials. The leaf transpiration rate, stomatal conductance, intercellular CO 2 concentration and net photosynthetic rate of three materials decreased after the treatment of PEG stress. The transpiration rate and stomatal conductance of IRAT109 and upland rice IL392 were significantly higher than those of rice YueFu with the prolonging of drought stress time, indicating that the upland rice had a stronger Drought resistance. The actual photochemical quantum efficiency, photochemical quenching coefficient and relative electron transfer rate of the three materials after PEG treatment decreased and the heat dissipation increased. The actual photochemical quantum efficiency, photochemical quenching coefficient and relative electron transfer rate of upland rice leaves were both earlier and larger than those of rice and rice lines, which further indicated that paddy rice responded more quickly to transient drought.