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Straw mulch-based no-tillage improves tillering capability of dryland wheat by reducing asymmetric competition between main stem and tillers

引用

The Crop Journal 2022年第3期10卷 864-878页

作者： Hongkun Yang Yun Xiao Peng He Dailong Ai Qiaosheng Zou Jian Hu Qiong Liu Xiulan Huang Ting Zheng Gaoqiong Fan Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province Sichuan Agricultural UniversityChengdu 611130SichuanChina Key Laboratory of Crop Eco-Physiology&Farming System in Southwest China Ministry of Agriculture and Rural AffairsChengdu 611130SichuanChina State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Ministry of Science and TechnologyChengdu 611130SichuanChina

The moisture-conserving effect of straw mulch-based no-tillage(SMNT)is expected to increase fertile spikes and grain yield in environments with rainfall less than 200 ***,the mechanisms under-lying the positive effect of SMNT on wheat tillering are not fully elucidated.A split-plot experiment was designed to investigate the combined effects of SMNT and cultivars on tillering of dryland wheat grown under both dry and favorable *** of SMNT to a cultivar with 1-2 tillers exploited both tillering and kernel-number plasticity,increasing the mean grain yield by 20.5%.This increase was attrib-uted primarily to an increased first-tiller emergence rate resulting from increased N uptake,leaf N con-tent,and N remobilization from tillers to their *** second and third tillers,as transient sinks,contributed to the tiller survival rate,which depends on tiller leaf *** increased total N uptake by SMNT also increased the dry mass yield of tillers and the C:N ratio,reducing the asymmetric compe-tition between main stem and *** to these beneficial effects,reduced mitogen-activated pro-tein kinase(MAPK)and abscisic acid signals were observed under SMNT,whereas indole-3-acetic acid(IAA)signals and genes involved in DNA replication and mismatch repair were *** signals activated three critical transcription factors(the calmodulin-binding transcription activator,GRAS domain,and cysteine-2/histidine-2 family)and further increased rapid drought response and tiller main-tenance after stem *** biosynthesis,sphingolipid biosynthesis,and galactose metabolism were most relevant to increased tillering under SMNT because of their critical role in drought response and lignin *** results suggest that straw mulch-based no-tillage activates rapid drought response and improved wheat tillering by coordinating root N uptake,N remobilization,and asymmetric competition between main stem and tillers.

关键词： Straw mulch-basedno-tillage wheat tillering Stable isotopetracing Transcriptome Metabolomics

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