OsmiR156对分蘖期水稻根系生长性状影响

The Effect of OsmiR156 on Root Growth Traits of Rice at the Tillering Stage

水稻根系发育及生理特性对水稻生产具有重要的意义。OsmiR156对水稻株型、产量等性状具有重要影响,其中最明显的表型特征为过表达OsmiR156株系材料的分蘖数显著增加。本研究系统比较了OsmiR156过表达水稻材料与野生型对照‘日本晴’在苗期至分蘖期的根系生长发育的形态和生理特性差异。试验结果表明,OsmiR156可影响水稻根长、根重、根体积、过氧化氢酶及过氧化物酶活性等。与对照相比,在苗期OsmiR156过表达株系的根长较短,根数少,平均每株的根系的体积、鲜重小;而在分蘖期OsmiR156过表达株系根系的相关指标均比对照高,且CAT与POD酶活性存在显著差异。上述结果表明OsmiR156可影响水稻根系发育。

Rice root system and its physiologic characteristics are of great significance to rice products.OsmiR156 plays a vital role in rice plant type,yield and other traits,and the most obvious phenotypic feature was that the tiller number of overexpressed OsmiR156 was significantly increased.The morphological and physiological characteristics of root growth and development between OsmiR156 overexpressed rice and wild type from seedling stage to tillering stage were systematically compared.The results indicated that OsmiR156 can not only influence rice maximum length,weight,volume and other traits,but also influence the catalase and peroxidase activities of rice.Compared with the control,OsmiR156 overexpressed lines had shorter maximum root length,fewer root number,smaller volume and fresh weight per plant at seedling stage.However,at tillering stage,all of those root related indexes of OsmiR156 overexpressed lines were higher than those of that in control,and there were significant differences in CAT and POD enzyme activities.These results indicated that OsmiR156 can affect root development ofrice.