不同粒型优质稻花后干物质流转特性研究

选取2个具有代表性的不同穗粒优质籼型水稻品种八桂香(大粒型)和桂华占(小粒型),通过早、晚稻品种比较试验,研究了优质稻花后叶、茎鞘内干物质流转动态特性及籽粒实时生长状况.结果表明:优质稻花后茎、叶干质量逐渐减少,供籽粒灌浆的绿叶流转量早稻大于晚稻,茎鞘流转量晚稻大于早稻;地上总干质量呈上升趋势,增长关键期为3~12 d;早稻干物质积累和启动时期要早于晚稻,晚稻茎鞘物质储存多,转运率高,后期光合功能丧失较快,积累干物质少;不同穗粒型优质稻籽粒干物质灌浆积累和动态存在较大差异,小粒型灌浆启动时间早于大粒型,延迟时间晚于大粒型,大粒型最大灌浆速率大于小粒型.

Research on Dry Matter Translocation Characteristics of Different Spike Type of the High Quality Indica Rice After Anthesis

This experiment was conducted to analyze the dynamic characteristics of the translocation of dry matter and grain growth post-heading in two the high quality varieties of indica rice,Baguixiang (long grain),Guihuazhan(short grain).The results showed that the dry matter mass in stem and leaf was reduced gradually for the grain filling,the translocation rate of green leaf in the early season was more than that in the later season,and the translocation rate of stem sheath in the later season was bigger than that in the early season.The total dry matter mass on ground gradually increased and the growth critical period was 3-12 days after anthesis.The time of dry matter accumulation and start in early season was earlier than that in the later season.The dry matter accumulated in stem and sheath of high quality varieties of indica rice in early season was high and its transportation rate was much more.The function of photosynthesizes declined more quickly and the accumulation of dry matter in leaf was also fewer in later period.There was difference in dry matter accumulation to the different spike type rice during grain filling,the short grain rice was advantageous to the material accumulation,its starting time of grain filling was earlier than that of the long grain rice while its delaying time was later than that of the long grain rice,and the maximum of grain filling rate of the long grain rice was higher than that of the short grain rice.