幼穗形成期水分胁迫后复水对水稻叶片光合特性及物质生产的影响

Young Panicle Formation Stage after Water Stress on the Production and Transport of Photosynthate in Rice

以杂交籼稻品种冈优527为试材,于幼穗形成期设置短期轻度水分胁迫(Short and light water stress,SLS)、长期轻度水分胁迫(Long and light water stress,LLS)、短期重度水分胁迫(Short and heavy water stress,SHS)以及长期重度水分胁迫(Long and heavy water stress,LHS)4个水分处理,并以习惯水层灌溉(Traditional flooding,TF)为对照。研究复水后水稻叶片光合特性、干物质积累与运转。试验结果显示:在幼穗形成期水分胁迫后,水稻叶面积、叶绿素a/b、SPAD值、净光合速率均降低;短期轻度水分胁迫(SLS)处理复水后叶面积、叶绿素a/b、SPAD值、净光合速率均远远高于对照,同时茎鞘物质转化率和输出率也都高于其他水分处理。结果说明:在幼穗形成期,经过短期轻度干旱复水后,叶绿素、光合速率、叶面积等能迅速恢复甚至激发更高的光合水平,表现为后期干物质积累多、转运高,能达到节水的效果。

Through the study of different time and different degrees of water stress in young panicle formation stage of rice,to study the effects of rice leaf area,chlorophyll content,photosynthetic rate,dry matter translocation, The results show that photosynthetic rate ,Chla/b,SPAD content under water stress were lower in leaf net ,After re-waterinng ,photosynthetic rate , Chla/b, SPAD content at short-duration treatment is much higher than that of the control level ,stem and sheath material conversion rate and output rate were show that （-25 ±5 ） kPa under water stress of short duration treatment reached the highest .The result that in young panicle formation ,stage,the chorl-phyll ,photosynthetic rate and leaf area can grow quickly ,in later stage ,the dry matter accumulate more and transfer become fast ,it can led to reduce water and synergy .