不同水稻品种种子萌发生理特性差异研究

为研究不同水稻品种的种子萌发生理特性,根据24个水稻品种的萌发情况,筛选萌发速度差异的水稻品种5个,分别代表萌发速度快、中、慢3种类型。种子萌发生理特性结果表明,萌发期内发芽速度存在差异的水稻品种,其淀粉酶活性、可溶性糖含量均存在差异。萌发速度快的水稻品种‘盐两优888’和‘盐恢888’,其α-淀粉酶活性、β-淀粉酶活性高,有助于种子内淀粉的分解,同时这2个品种在萌发过程中可溶性糖含量高,为种子萌发提供了能量和物质。反之,萌发速度慢的水稻品种,种子淀粉酶活性低、可溶性糖含量低。说明水稻种子中淀粉酶的活性、可溶性糖含量与种子萌发速度呈正相关。

Seed Germination of Rice Cultivars: Differences in Physiological Characteristics

To study the physiological characteristics of seed germination of different rice cultivars, we selected 5 cultivars from 24 based on their seed germination rate, which represented 3 types of quick, medium and slow germination. The physiological characteristics of seed germination showed that: there were some differences in amylase activity and soluble sugar content among the cultivars with different germination rates; the cultivars (‘Yanliangyou 888’ and ‘Yanhui 888’) with quick germination rate had higher α-amylase activity and β-amylase activity, which were helpful to decompose starch, and had higher soluble sugar content during germination period, which could offer the energy and substances for seed germination; on the contrary, the cultivars with slow germination rate had lower amylase activity and soluble sugar content of seed. This study indicates that the amylase activity and soluble sugar content of rice seed have a positive correlation with the germination rate.