首页|Differences between two wheat genotypes in the development of floret primordia and contents of pigments and hormones

Differences between two wheat genotypes in the development of floret primordia and contents of pigments and hormones

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
Promoting more floret primordia within a spike to acquire fertile potential during the differentiation and pre-dimorphism phases is critical for increasing the number of fertile florets per spike(NFFs).However,it is yet unknown the physiological mechanism regulating the complex and dynamic process.This study aimed to clarify how intra-spike hormones,pigments,and assimilates coordinate with each other to reg-ulate spike morphology and then floret primordia development.A two-year field experiment was con-ducted with two winter wheat genotypes:N50(big-spike with greater NFFs)and SM22(medium-spike with fewer NFFs).We monitored high temporal and spatial-resolution changes in the number and morphology of floret primordia within a spike,as well as in intra-spike hormones,pigments,and assimilates.Our results revealed that the big-spike genotype had more NFFs than the medium-spike genotype,not only because they had more spikelets,but also because they had greater NFFs mainly at central spikelets.More floret primordia at central spikelets had sufficient time to develop and acquire fer-tile potential during the differentiation phase(167-176 d after sowing,DAS)and the pre-dimorphism phase(179 DAS)for the big-spike genotype than the medium-spike genotype.Floret primordia with fer-tile morphology during the pre-dimorphism phase always developed into fertile florets during the dimor-phism phase.Those early-developed floret primordia most proximal and intermediate to the rachis in the big-spike genotype developed faster than the medium-spike genotype.Correspondingly,the spike dry matter and pigments(chlorophyll a,chlorophyll b,carotene,and carotenoids)content during 170-182 DAS,auxin(IAA)and cytokinin(CTK)content on 167 DAS were significantly higher in the big-spike geno-type than in the medium-spike genotype,while jasmonic acid(JA)content was significantly lower in the big-spike genotype compared to the medium-spike genotype during 167-182 DAS.Since the significant differences in intra-spike hormone content of the two genotypes appear earlier than those in dry matter and pigments,we propose a possible model that helped the N50 genotype(big-spike)to form more fertile florets,taking the intra-spike hormone content as a signaling molecule induced assimilates and pigments synthesis,which accelerated the development of more floret primordia during the differentiation phase and then acquired fertile potential during the pre-dimorphism phase,finally improved the NFFs.Our high temporal and spatial-resolution analysis provides an accurate time window for precision cultivation and effective physiological breeding to improve the number of fertile florets in wheat.

Fertile floretsFloret primordia developmentIntra-spike hormonesJasmonic acidPhotosynthetic pigments

Liangyun Wen、Yaqun Liu、Bingjin Zhou、Wan Sun、Xuechen Xiao、Zhimin Wang、Zhencai Sun、Zhen Zhang、Yinghua Zhang

展开 >

College of Agronomy and Biotechnology,China Agricultural University,Beijing 100193,China

Engineering Technology Research Center for Agriculture in Low Plain Areas,Cangzhou 061800,Hebei,China

Scientific and Technological Innovation Team Project of Seed Industry for Salinealkali Tolerant Crop in Hebei Province国家重点研发计划国家重点研发计划China Agriculture Research System

23327501D2022YFD23008022022YFD1900703CARS-3

2024

10.1016/j.cj.2024.04.007

作物学报(英文版)

作物学报(英文版)

CSTPCD
ISSN：
年,卷(期)：2024.12(4)
  • 1