植物学报2025，Vol.60Issue(6)：901-913,13.DOI:10.11983/CBB25060
内源激素对高粱主茎与分蘖株高差异的影响
Effects of Endogenous Hormones on Height Difference Between Main Stem and Tiller of Sorghum bicolor
摘要
Abstract
INTRODUCTION:Tiller height higher than main stem is one of the important factors affecting the uniformity and mecha-nized production of sorghum.Sorghum with tiller height equal to that of the main stem can be densely planted and har-vested mechanically.Endogenous hormones play an important regulatory role in the process of plant height development.Understanding the impact of endogenous hormones on the height difference between main stem and tiller in sorghum is of great significance for the improvement of sorghum varieties with tiller higher than the main stem. RATIONALE:To further explore the effects of endogenous hormones on height difference between main stem and tiller of sorghum,Sorghum K35-Y5 with the similar height of main stem and tiller and 1383 with higher tiller than main stem were used to measure the plant height and endogenous hormone contents in main stem booting stage,tiller booting stage,main stem flowering stage and tiller flowering stage,and analyze the dynamic change and correlation,laying a foundation for studying the regulatory mechanisms of main stem and tiller height in sorghum and for improving plant architecture. RESULTS:The height difference of main stem and tiller in different stages showed that the main stem of K35-Y5 was higher than that of tiller in the first three periods,and the height of main stem and tiller was basically the same at tiller flowering stage.The main stem height of 1383 was higher than that of tiller in main stem booting stage,the height of main stem and tiller was basically the same in tiller booting stage,and the height of tiller was higher than that of main stem in the latter two stages.Analysis of dynamic changes of endogenous hormone in different stages showed that GA3 content in main stem and tiller was basically consistent with the change of plant height.The dynamic change of ABA in K35-Y5 main stem and tiller is basically the same,which was significantly higher than main stem of 1383 tiller in main stem flowering stage.The contents of IAA,ICA,tZR,IPA,Dx and JA showed a decreasing trend.ACC,SA,JA and H2JA had no obvious characteristics.The correlation analysis showed that the difference of tiller and main stem was positively correlated with the relative content of GA3 at tiller booting stage,main stem flowering stage and tiller flowering stage,and positively cor-related with the relative ratio of GA3/ABA at main stem flowering stage and tiller flowering stage. CONCLUSION:The height difference of main stem and tiller was closely related to the relative content of GA3 at tiller booting stage,main stem flowering stage and tiller flowering stage.Through the treatment of GA3 and subsequent paraffin section analysis,we found that spraying GA3 affects cell elongation to achieve the improvement of plant height uniformity.This will be of great significance for the breeding of sorghum varieties suitable for mechanized production.关键词
高粱/主茎/分蘖/株高差异/内源激素Key words
Sorghum bicolor/main stem/tiller/height difference/endogenous hormones引用本文复制引用
王瑞,赵威军,白洋,程庆军,张海燕,闫凤霞,凌亮..内源激素对高粱主茎与分蘖株高差异的影响[J].植物学报,2025,60(6):901-913,13.基金项目
国家自然科学基金(No.32272164)/山西省回国留学人员科研资助项目(No.2024-071)、山西省博士研究生、博士后研究人员来晋工作奖励经费科研项目(No.SXBYKY2024118)和山西省现代农业产业技术体系建设专项(No.2025CYJSTX10-5) （No.32272164）
