水稻穗发芽与籽粒内可溶性糖和α-淀粉酶活性的品种差异

SOLUBLE SUGAR LEVEL AND ALPHA-AMYLASE ACTIVITY IN GRAINS OF SOME RICE VARIETIES WITH DISTINGUISHABLE VIVIPARITY DURING GRAIN DEVELOPING

对四个穗发芽能力不同的水稻品种籽粒潜在发芽势,可溶性糖含量和α-淀粉酶活性的测定结果表明:(1)所有供试品种在始穗10天后均有部分籽粒可以发芽。其中易穗发芽的珍汕97B的潜在发芽能力明显地高于不易穗发芽的协优64,加系758;(2)易穗发芽品种籽粒发育前期(始穗后5～20天)可溶性糖含量高,维持时间长,其峰值出现迟于不易穗发芽的品种,而且始穗后30天又出现第二峰值;(3)籽粒成熟后期易穗发芽品种α-淀粉酶活性为不易穗发芽品种的2～5倍。抑制剂2号时珍汕97B发芽有较强的抑制作用,并能相应降低籽粒内α-淀粉酶活性和可溶性糖的含量。因此,水稻穗上发芽现象与籽粒内较长时间维持高的可溶性糖的含量和α-淀粉酶活性有密切关系。

The potential gcrminability, soluble sugar content and α-amylase activity during grain development were determined of 4 kinds of rice varieties with distinguishable extent of viviparity. The results were shown as follows: 1) The potential gcrminability of varicty Zhenxian 97B which was the most liable to viviparity was the highest among all testcd varieties; 2)In grains of 2 varieties liable to viviparity, high level of soluble sugar was maintained for a longer time. Moreover, in the developing grains there were 2 peaks of soluble sugar, the second was at about the 30th day after caring; 3) During the latestage of grain developing, the α-amylase activity was 2-5 folds higher in thc grains liable than not liable to viviparity. Furthermore, inhibitor No.2 could rcstrain the germi nation of Zhenxian 97B grains, suppress the activity of α-amylase and decline the level of soluble sugar. It could be concluded that the viviparity of rice is closely rclatcd to the high level of soluble sugar and the strong activity of α-amylase in the late stage of grain development.