镧对西葫芦种子酸雨胁迫缓解的剂量效应

Dosage Effects of LaCl_3 Alleviation on Acid Rain Stresses During Cucurbita pepo Seed Germination

以西葫芦种子为试材,通过种子萌发试验,研究了不同剂量镧对酸雨胁迫的缓解效应。结果表明:用8～15 mg/L的LaCl3浸种可显著改善酸雨胁迫下西葫芦种子的萌发状况。在pH 3.5时,种子的发芽率、发芽势、发芽指数和活力指数显著升高,并接近于对照;pH 3.0时也有明显改善,但达不到对照水平。同时,镧的最适剂量与酸雨胁迫的强度有关,在pH>3.5时为10mg/L;在pH≤3.5时为12 mg/L。因此,最适剂量的选择应考虑酸雨胁迫的强度,一般可用pH3.5的酸雨进行选择。

Selecting Cucurbita pepo as the experimental material,the dosage effects of LaCl3 alleviation on acid rain（AR） stresses during the seed germination were studied.The results showed that the AR damage will be alleviated obviously,and the germination of C.pepo seed will be increased when seed soaked in 8～15 mg/L LaCl3 solution.Under the AR stress（pH 3.5）,the germination indexes（germination rate,germination potential,germination index and vigor index） were all higher than untreated seeds,and returned as close to those of the control.Under the AR stress（pH 3.0）,the four indexes were higher than untreated ones,but can not returned to the control level.In addition,the best dosage of LaCl3 was associated with the intensity of AR stress.It was 10 mg/L under RA stresses pH3.5 and 12 mg/L under RA stresses pH≤3.5,respectively.Therefore,the intensity of AR stress should be considered when the optimal LaCl3 dosage was chosen.Generally,the optimal dosage may be chosen under the AR stress pH 3.5.