硝酸镧对冬小麦种子萌发活力的影响

Effects of La(NO 3) 3 on the Seed Vigor of Winter Sweat

利用不同浓度的硝酸镧Ｌａ（ＮＯ３）３水溶液处理冬小麦种子，结果表明：１０μｍｏｌ·Ｌ－１和０．１μｍｏｌ·Ｌ－１的Ｌａ３＋对种子萌发有轻微的刺激作用，并促进根、芽的生长，高浓度（≥２×１０５μｍｏｌ·Ｌ－１）的Ｌａ３＋则完全抑制了种子的萌发；Ｌａ（ＮＯ３）３降低小麦芽中的过氧化氢酶（ＨＤＰ）活性，但０．１μｍｏｌ·Ｌ－１、１０μｍｏｌ·Ｌ－１及１００μｍｏｌ·Ｌ－１的Ｌａ３＋提高了小麦根的ＨＤＰ活性；０．１μｍｏｌ·Ｌ－１的Ｌａ３＋显著提高了种子的α－淀粉酶活性及（α＋β）－淀粉酶活性．

Treated seeds of winter sweat with different concentrations of La(NO 3) 3 ,the results showed that 10 μmol·L -1 and 0.1μmol·L -1 La 3+ slightly stimulated seed germination,shoot growth and root growth of sweat,and higher concertrations (≥2×10 5μmol·L -1 )completely inhbited the germination .The hydrqogen peroxidase activity of the shoots was decreased treated 10 -4 to 4×10 5 μmol·L -1 La 3+ .While the hydrogen peroxidase activity of the roots was increased with 0.1 μmol·L -1 and 10μmol·L -1 La 3+ .α amylase activity and (α+β) amylase activity of the germed seeds were increased distinctly at 0.1 μmol·L -1 and 10 μmol·L -1 La 3+ .