转BADH基因水稻旱作与水作条件下籽粒干物质积累动态的比较研究

对转甜菜碱醛脱氢酶(BADH)基因水稻品系52-7旱作与水作条件下的籽粒灌浆期干物质积累动态进行了比较研究。结果表明:旱作与水作条件下,强势粒和弱势粒的籽粒增重和淀粉积累过程均符合Richards模型。水作强、弱势粒的异步灌浆比旱作明显;旱作强、弱势粒的平均灌浆速率比水作大,到达最大灌浆速率的时间提前,活跃灌浆期缩短;旱作强势粒的最大灌浆速率比水作增大,旱作弱势粒的最大灌浆速率比水作小。开花后5～20d,旱作强、弱势粒的淀粉积累量都略高于水作,之后,则低于水作。水、旱作强势粒可溶性糖含量的变化趋势基本一致,但其弱势粒间的变化趋势存在明显差异。旱作与水作的千粒重差异达到显著水平,但穗粒数、实粒数、结实率及产量的差异未达到显著水平。

Comparative studies on the accumulation of dry matter during grain filling of transgenic (BADH) rice genotype under paddy and upland conditions

Richards equation was used to express dry matter accumulation during grain filling of trangsgenic (BADH) rice genotype 52-7 under irrigated and un-irrigated cultivation. The results showed that Rrichards equation was fitted to the process of weight increase and starch accumulation of both superior and inferior grains for both water treatments. Asynchronous grain filling was more severe in paddy cultivation than upland cultivation. Under upland condition, the mean rates of grain filling in both superior and inferior grains were greater, the occurrence time of the maximum grain filling rate was advanced, and the active grain filling period was shortened. The maximum grain filling rate of the superior grains under upland was larger than that under paddy, while the maximum grain filling rate of the inferior grains under upland was smaller than that under paddy. During 5d-20d after flowering, the starch accumulation at the beginning of grain filling under upland was appreciably higher than that under paddy, and then it was contrary. The trend of soluble sugar content in superior grains was basically identical under both paddy and upland, but the difference of soluble sugar content in inferior grains was evident. The difference of 1000-grain weight between upland and paddy was significant, but that of grain number per panicle, number of filled grains per panicle, seed setting rate and yield was not significant.