| 摘要: |
| 对4个小麦品种开花前穗水溶性碳水化合物（WSC）的分析表明，在穗发育早期阶段，穗中WSC的主要组分是果聚糖，穗果聚糖浓度约在开花前11～12d达高峰，此后迅速下降。测定了穗中与果聚糖代谢有关的几种酶[蔗糖-蔗糖果糖基转移酶（SST）；果聚糖水解酶（FEH）和酸性蔗糖转化酶（AI）]的活性表明，在穗发育早期阶段，SST活性＞FEH活性，而在穗发育后期阶段，FEH活性＞SST活性；AI活性只在开花前的8d内维持较高水平。根据研究得出结论：果聚糖的积累和利用是麦穗开花前糖代谢的一个重要特征；不同品种穗粒数的差异是与穗中果聚糖代谢能力的差异密切相关的。 |
| 关键词: 小麦 穗粒数 果聚糖 |
| DOI： |
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| 基金项目:国家攀登计划项目 |
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| Abstract: |
| The water soluble carbohydrates (WSC) of spikes before anthesis were analyzed in the four cultivars (015, 2410, ND92 and YD1817) of winter wheat. It was showed that at early period of spike growth, fructan was the main component of WSC in the spike, and its content peaked at 11~12 days be fore anthesis, then fell quickly. The activities of fructan and sucrose metabolism enzymes (sucrose-sucrose fructosyltransferase SST, fructan exhydrolase FEH and soluble acid invertase AI) were measured, it was found that in the same spike, SST activity was higher than FEH activity in the earlier period of spike growth, but was lower in the last 8 days prior anthesis. Activity of AI was high within the week before anthesis. It was concluded that the accumulation and consumption of fructan is one of important character istics of carbohydrate metabolism in young spike be fore anthesis; the difference in the ability of fructan metabolism is associated with the difference of grain number between genotypes. |
| Key words: wheat,fructan,grain number |
