三种苹果属植物幼苗拒Na^+机理的研究

Studies on Na^+ Exclusion Mechanism of Three Maius Seedlings

以苹果属耐盐性不同的山定子、小金海棠和珠眉海棠的幼苗为试材,通过拒Na+能力的测定确定了盐敏感种的整体拒Na+能力为65％左右,中等耐盐种的整体拒Na+能力为80％左右,耐盐种的整体拒Na+能力为90％左右,根部和茎基部的拒Na+能力是苹果属植物幼苗整体拒Na+能力的主要部分,耐盐种根部和茎基部的拒Na+能力明显大于盐敏感种。耐盐种侧根、茎基木质部和老叶的Na+累积效应明显,是主要的聚Na+部位。耐盐种通过地上部Na+的重新分配和再转运,使幼叶和成熟叶Na+含量更低。

Using seedlings of Malus baccata, M. xiaojinensis and M. zumi as the experimental materials. Na+ exclusion capability was determined to affirm the whole Na + exclusion capability, and the whole Na + exclusion capability of salt-sensitive species was about 65 % , middle salt-tolerant species about 80 % , salt-tolerant species about 90 %. Na+ exclusion capability of roots and stem base was the main parts of the whole Na+ exclusion capability in Malus seedlings. Na+ exclusion capability in roots and stem base of salt-tolerant species was obviously higher than that of salt-sensitive species. Lateral roots, stem base xylem and old leaves of salt-tolerant cultivar obviously occured Na+ accumulative effect, and were main Na+ accumulative localizations. Through shoot Na+ re-distribution and re-transportation, Na+ content became even less in young leaves and mature leaves of salt-tolerant species.