植物营养与肥料学报2017，Vol.23Issue(1)：83-90,8.DOI:10.11674/zwyf.16077
玉米根系对局部氮磷供应响应的基因型差异
Differential response of maize roots to heterogeneous local nitrogen and phosphorus supply and genotypic differences
摘要
Abstract
[Objectives] It is important to understand the root response to local N and P supply among genotypic differences to help breeding nitrogen (N) and phosphorus (P) efficient maize cultivars as nutrient distribution in soils is heterogeneous naturally.[Methods] A split-root solution culture system was set up to evaluate root response to local N-and P-supplementation in three maize hybrids.[Results] The root responses of the three genotypes showed different to local N or P supplement.Compared to NE15,JD20 and ZN99 were more sensitive to local N supply.Root length of JD20 and ZN99 in rich N side increased by 79％ and 50％ respectively,comparing with no N side,especially in the part with lateral root diameter ≥ 0.12 mm.Similar response was not shown as significant in NE15 root as the other two genotypes.After P supplement treatment,however,the root dry weight and axial root length of NE 15 were increased by 38％ and 24％ respectively in +P side compared to the no P supply,while the lateral root length of ZN99 was increased by 35％ in +P side.The majority of root length increase of JD20 and ZN99 were found in root diameter greater than 0.12 mm part in rich N side,while NE15 genotype increased its root length mostly with root diameter between 0.12 to 0.24 mm in +P side.In ZN99 samples,the fine roots with diameter ≤ 0.12 mm were increased most significantly in +P side.Not only different responses to single nitrogen and phosphorus supplement by maize genotypes,but also interaction between genotypes and nutrient supplement were found.In JD20,the lateral roots (especially those with diameter ＞ 0.12 mm) were more responsive to local N than local P supply.While NE 15 showed more root dry weight gain affected by local P than local N supply.[Conclusions] The different response of heterogeneous N or P supply from different maize genotypes provides information how to use local N and P supply efficiently to increase maize production.关键词
局部供氮/局部供磷/基因型/根系/玉米Key words
local nitrogen supply/local phosphorus supply/genotype/root system/maize引用本文复制引用
陈哲,伊霞,陈范骏,米国华,田平,齐华..玉米根系对局部氮磷供应响应的基因型差异[J].植物营养与肥料学报,2017,23(1):83-90,8.基金项目
公益性行业(农业)科研专项经费项目(201503116) （农业）
国家自然科学基金(31572186)资助. （31572186）
