干旱胁迫下保水剂对石楠苗生理生化特性的影响

Effect of Hydrogel on Physiological Biochemical Characteristics of Photinia serrulata under Drought Stress

在干旱胁迫下,对盆栽石楠苗的存活期、生长率、游离脯氨酸、可溶性糖、光合生理特性进行分析。结果表明,在有限水分条件下,施用保水剂,苗木存活期延长3.5-38.5 d;苗木生长受到抑制的时间延后0-28 d;叶片中可溶性糖和游离脯氨酸开始积累时间延后,积累量减少;净光合速率、蒸腾速率、气孔导度分别提高了5.6%-168.9%、28.6%-2 342.6%、0-4 700%。保水剂用量越大,减缓水分胁迫的能力越强。

Under drought stress, study was carried out on the survival period, the growth efficiency, and the physiological biochemical properties of Photinia serrulata seedlings in the pot experiment. The result showed that potted seedlings survival time was prolonged by 3.5 - 38.5 days. It Was prolonged 0 - 4 weeks since the growth of seedlings was retarded. With the increasing of hydrogel application, the accumulation of free proline and soluble sugar in leaves of seedling was postponed, and the amount decreased. On the 24th day after watering, the net pho- tosynthetic rate （Pn）, transpiration rate （Tr） and stamatal conduction were improved by 5.6% -168.9%, 28.6% - 2 342.6% and 0 - 4 700% , respectively, by application of hydrogel. The more hydrogel was applied, the more effectively drought stress on the plants was mitigated.