乙烯消减盐抑制苜蓿种子萌发的机理研究

0．25mol/L的NaCl胁迫下的苜蓿种子转变1－氨基环丙烷－1－羧酸（ACC）和乙烯利为乙烯的能力明显降低。加入外源乙烯能引发受NaCl胁迫48h的苜蓿种子迅速萌发，但对种子内的Na^ 含量无明显影响。在种子吸涨过程中，外源乙烯对受NaCl胁迫的种子的水分吸收也无影响。外源乙烯能显著地提高NaCl胁迫下种子的呼吸速率和ATP含量。对乙烯消减盐抑制苜蓿种子萌发的作用机理进行了讨论。图6表1参21

STUDIES ON INHIBITION MECHANISM OF GERMINATION BY ETHYLENE IN SALT-STRESSED ALFALFA SEEDS

The ability of alfalfa seeds to convert various concentration of 1-aminocyclopropane-1-carboxylic a cid (ACC) and ethephon (ETH) to ethylene was found much lower under saline (c（NaCl）=0.25 mol/L) than under no-saline condition. Addition of exogeno us ethylene (φ=3 μL/L) could trigger rapid germination of alfalfa seed stressed by 0.25 mol / L NaCl solution for 48 h, but did not affect Na+ conte nt in NaCl-stressed seeds. During the imbibition of seeds, addition of exogenou s ethylene also did not affect the water uptake of the NaCl-stressed seeds. The results showed no obvious difference in water or Na+ content in the seeds str essed by NaCl in either the presence or the absence of exogenous ethylene. Exoge nous ethylene greatly increased respiratory rate and ATP level in NaCl-stressed alfalfa seeds. It is presumed that enhancement of ATP formation is an importan t mechanism by which the inhibition of germination of salt-stressed alfalfa see ds is alleviated by ethylene. Mechanism of alleviation of inhibition by ethylene in salt-stressed alfalfa seeds was discussed. Fig 6, Tab 1, Ref 21