水稻叶龄变化对短日长的响应

Response of leaf age in rice to short day length

光周期是影响水稻叶片数的重要环境因子。本研究利用盆栽试验研究了10 h短日长处理对水稻品种叶片数的影响。结果表明,对生产中主茎总叶片数14~17叶的水稻品种来说,除3叶期外,短日长处理不同程度减少水稻主茎总叶片数,7~9叶龄期对短日长最敏感,7叶期和9叶期短日长处理使水稻主茎总叶片数显著减少。7叶期短日处理,水稻主茎总叶片数减少幅度表现为:高短日长敏感型品种>中短日长敏感型品种>低短日长敏感型品种。短日长处理对所有品种穗分化期叶龄余数影响不大。在不同品种类型中,籼粳杂交稻对短日长响应最为敏感,短日长处理下籼粳杂交稻主茎叶片数下降幅度大于粳稻和籼稻。在同一亚种内不同品种对短日长响应的敏感性也存在差异。

Day length is an important environmental factor affecting the number of rice leaves.In this study,the effects of 10 hours short day treatment on the number of rice leaves were studied by pot experiment.The results showed that,except for the 3-leaf stage,the final main-stem leaf number of rice with14-17 leaves was reduced under short day length treatment.Moreover,the final main-stem leaf number was significantly decreased under the shortday length treatment at 7-leaf stage abd 9-leaf stage.The reduction of final main-stem leaf number after short day length treatment at the 7-leaf stage of rice presented the tendency as follows:high short-day sensitive cultivars>medium short-day sensitive cultivars>low short-day sensitive cultivars.The short-day length did not influence the leaf age remainder at panicle initiation stage of every rice cultivar.For different subspecies,indica-japonica hybrid rice was most sensitive to short day length treatment.In addition,the reduction of final main-stem leaf number of indica-japonica hybrid rice was higher than that of japonica rice and indica rice under short day length treatment.In conclusion,the sensitivity of different varieties in the same subspecies to short day length is different.