晚稻品种种子萌发期耐酸性比较研究

为了给酸化稻田适宜晚稻品种选择提供参考,通过室内发芽试验考察了25个晚稻品种(品系)在6个p H梯度下的发芽率、发芽势和单苗鲜重,比较研究了其种子萌发期耐酸性差异。结果表明:(1)品种间发芽率、发芽势、单苗鲜重差异很大,其中3号、7号、10号、15号品种较高,18号、19号、21号、22号品种较低;(2)6号、11号、12号、13号、14号、16号、19号、21号、23号、24号、25号品种的发芽率、发芽势和单苗鲜重在6个p H梯度处理下变化幅度较大,被初步判定为酸性敏感型品种;(3)2号、3号、5号、10号、15号、17号品种的发芽率、发芽势和单苗鲜重在6个p H梯度处理下变化幅度较小,被初步判定为酸性迟钝型品种。种子萌发期耐酸性比较,可为初步筛选酸化稻田适宜水稻品种提供重要参考。

Comparison on Acid-tolerance of Late Rice Varieties at Seed Germination Stage

To provide reference for selecting suitable late rice varieties for acidified paddy field, a germination experiment was conducted under 6 pH levels to compare the acid-tolerance of 25 late rice varieties at seed germination period by examining the germination rate, seed germination potential and fresh weight per seedling. The results showed that: (1) there were clear difference in germination rate, seed germination potential and fresh weight per seedling among varieties, in which those of No.3, 7, 10 and 15 variety were higher, and those of No.18, 19, 21 and 22 variety were lower; (2) the change extent of germination rate, seed germination potential and fresh weight per seedling of No. 6, 11, 12, 13, 14, 16, 19, 21, 23, 24 and 25 under 6 pH levels were bigger, so these varieties belonged to acid-sensitive varieties; (3) the change extent of germination rate, seed germination potential and fresh weight per seedling of No. 2, 3, 5, 10, 15 and 17 under 6 pH levels were smaller, so these varieties belonged to acid non-sensitive varieties. Comparison on acid-tolerance of seeds at germination stage can provide important reference for preliminary screening of suitable rice varieties for acidified paddy field.