摘要： 在大田栽培条件下,研究了大穗型冬小麦品种兰考矮早八主茎、分蘖Ⅰ、分蘖Ⅱ分蘖成穗、碳氮代谢的变化及其种植密度的调控效应。结果表明,小花分化期,主茎与分蘖幼穗分化进程差异很小,之后差距增大,且随密度增加分蘖的幼穗分化更加滞后。262.5×104苗/hm2密度下,可溶性糖含量及碳氮比优势明显,不同茎蘖间差异较大,具体表现为主茎>分蘖Ⅰ>分蘖Ⅱ。随密度增大氮含量降低,不同茎蘖间差异较小。表明在幼穗发育过程中,主茎竞争优势易引起分蘖碳素营养不良和碳氮失调,导致主茎与分蘖的差距拉大,影响分蘖成穗。
关键词:
冬小麦,
大穗型,
种植密度,
幼穗分化,
碳氮代谢
Abstract: Under field conditions, the large-spike winter wheat variety Lankao Aizao 8 was used to investigate thechanges of spike dffferentiation and cardorr nitrogen metalroli in main culm and tillers I and II,and the physiologicaleffects of plantira density on above characters.The results showed that the difference of spike differentiation between mainstem and tillers was little drring floret initiation, but became larger afterwards.The spike dffferentiation proeess of tillerswas lagged with the increase of density. The content of water soluble carlrohydrate(WSC)and carbon to nitrogen ratio(C/ N)were better under D2 planting density( 262. 5 x 104 plant/ ha),and showd large dffference in main cuhn and tillerswith a order of culm> tillers I >fillers II.The content of nitrogen decreased with the increase of density, lxrt the dffeences was obviorxs between main stem and tillers.This indicated that the competition superiority of main culm couldeasily carse the carbon malnutrition and the imbalance of carlrrnitrogen metabolism in tillers,which enlarged the dfffeonce between main culm and tillers and finally led to the death of tillers.
Key words:
Winter wheat,
Large spike,
Planting,
density,
Spike differentiation,
C/N metabolism
中图分类号:
郭天财, 徐丽娜, 冯伟, 盛坤, 朱云集. 种植密度对兰考矮早八幼穗分化和碳氮代谢的影响[J]. 华北农学报, 2009, 24(1): 194-198. doi: 10.7668/hbnxb.2009.01.043.
GUO Tian-cai, XU Li-na, FENG Wei, SHENG Kun, ZHU Yun-ji. Effects of Plant Density on Spike Differentiation and C/ N Metabolism of Lankao Aizo 8[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(1): 194-198. doi: 10.7668/hbnxb.2009.01.043.