Comprehensive Pattern of Primordium Initiation in Shoot Apex of Wheat

作     者：李存东 曹卫星 张月辰 

作者机构：南京农业大学农业部作物生长调控重点开放实验室南京210095 河北农业大学农学院河北保定071001 

出 版 物：《Acta Botanica Sinica》 (Acta Botanica Sinica（植物学报：英文版）)

年 卷 期：2002年第44卷第3期

页      面：273-278页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：国家自然科学基金 ( 3972 5 0 2 1 30 0 30 0 90 ) 国家十五 86 3高技术计划项目 ( 2 0 01AA2 45 0 41) 

主　　题：wheat shoot apex primordium initiation comprehensive pattern dynamic characteristics 

摘      要：The time course of the initiation of different types of apical primordia on the stem of wheat (Triticum aestivum L.) was investigated to establish a comprehensive pattern of apical primordium development and quantitative dynamic relationships among different primordium initiation. The results showed that the initiation of leaf and bracteal primordia took the S shape, and that of spikelet and floret took the rise stage of parabolic shape in relation to GDD (growing degree days after sowing) in wheat. The bracteal was much like vegetative rather than reproductive organ in terms of the dynamic pattern of primordium initiation. The progress of spikelet and floret primordium initiation could well reflect the characteristics of different genotypes and the impact of different ecological environments on wheat apical development. The integrated model of different primordium initiation in shoot of wheat was an S_shaped curvilinear, and could be divided into three sub_models. The number of leaf primordia was affected by both genotype and environment, while the numbers of bracteal, spikelet and floret primordia were affected mainly by environmental factors. Measured with mean thermochron, the rates of initiation of leaf, bracteal and spikelet primordia in normal planting were the highest among all the sowing date treatments. In contrast to the relationships among leaf, bracteal, spikelet and their initiation duration, the correlation between the number of floret and its initiation duration was highly significant.