果翅、盐分及干旱胁迫对白梭梭种子萌发的影响

Effect of Winged Perianth,Salt & Drought Stress on Germination of Halaxylon persicum

从生态学角度研究了果翅、温度、盐分和干旱胁迫等因素对白梭梭种子萌发的影响,结果表明:去除种翅能显著促进种子萌发,无翅种子比有翅种子萌发速率快(P<0.05),提早1 d达最高萌发率。变温条件有利于种子萌发。白梭梭种了萌发率随着NaCl浓度增加而降低,但在0.9 mol.L-1的浓度中仍有2%的种子萌发;将未萌发的种子移至蒸馏水中后,部分种子可以萌发,在较低浓度盐溶液(0.05～0.6 mol.L-1)中培养的种子其萌发恢复率低,而高浓度(0.7～1.0 mol.L-1)中培养的种子其萌发恢复率高。在较低程度的干旱胁迫下,白梭梭种子迅速萌发,而较高程度的干旱胁迫下种子萌发受抑制,在PEG浓度50%时不萌发;同等干旱胁迫程度下,无翅种子比有翅种子萌发率高。

From an ecological point of view,effect of winged perianth,temperature,salt,drought stress and other factors on seed germination of Halaxylon persicum were studied.Result shows that： removing seed wing can significantly promote seed germination;seeds without wing have faster germination rate（P0.05） than that of winged seed;seeds without wing can reach the highest germination rate a day earlier than winged seed.Variable temperature conditions are favorable for seed germination.Seed germination of Halaxylon persicum decrease with the increase of NaCl concentration,but 2% of the seed can still germinate under concentration of 0.9 mol·L-1;some seeds can germinate while non-germinated seeds were moved to the distilled water;germination recovery percentage of seeds cultured in lower concentrations of salt solution（0.05-0.6 mol·L-1） is low;germination recovery percentage of seeds cultured in high concentrations（0.7-1.0 mol·L-1） is high.Seeds of Halaxylon persicum germinate quickly under lesser degree of drought stress;seed germination of Halaxylon persicum is inhibited under greater degree of drought stress;seeds can＇t germinate in 50% PEG;germination rate of seeds without wing is higher than that of winged seeds under the same degree of drought stress.