HUBEI AGRICULTURAL SCIENCES ›› 2020, Vol. 59 ›› Issue (23): 174-179.doi: 10.14088/j.cnki.issn0439-8114.2020.23.039

• Biological Engineering • Previous Articles     Next Articles

Analysis of tillering characteristics, related-nitrogen assimilation enzyme activity and gene expression in rice

AN Qi, JI Wen-jun, HE Yong-gang, ZHANG Zhi-hong   

  1. College of Life Science/State Key Laboratory of Hybrid Rice,Wuhan University,Wuhan 430072,China
  • Received:2020-04-30 Online:2020-12-10 Published:2020-12-30

Abstract: Tillering of rice is one of the important agronomic traits that affect the number of panicles and thus the yield of rice.It was found that low-node (early-onset) tillers had higher yield per panicle than high-node (late-onset) tillers.12 rice varieties with different tillering characteristics were used as meterials.Based on the observation of tiller development dynamics under hydroponics conditions,ammonium nitrogen assimilation enzyme activity and rice tillering-related gene expression were analyzed.Correlation analysis found that the number of tillers was significantly positively correlated with the tillering rate in the second and third leaf positions,but no significant correlation between tiller number and tiller rate at the frist leaf position in rice.The tillering rate at the first leaf position was mainly affected by the ammonium assimilation enzyme activity in rice seedlings,while the expression of genes related to the auxin and monopetalactone signaling pathway did not significantly affect it.The second and third leaf tillering rate were relatively weakly affected by the seedling ammonium nitrogen assimilation enzyme activity and gene expression,but was mainly negatively regulated by the expression of genes related to the auxin and strigolactone signaling pathways.Besides,the soluble sugar content of rice seedlings,genes such as MOC1 that control tiller bud formation and genes that control CK synthesis were not significantly correlated with the tillering rate in the first,second and third leaf positions,while genes such as TB1 that regulate tiller bud elongation had a more significant effect on it.

Key words: rice (Oryza sativa L.), tiller, ammonium assimilation, hormone, gene expression

CLC Number: