摘要
为探讨外源Zn对小麦植株生育后期Zn吸收积累的影响,以河南省主要推广品种周麦18和矮抗58为材料,于2009-2010年进行网室盆栽试验,测定了不同浓度的Zn(0、200、400和800mg.kg-1干土,分别以Zn0、Zn2、Zn4、Zn8表示)处理下,小麦灌浆初期及成熟期植株叶片、茎鞘、穗部、籽粒及根等部位的Zn含量和干物质积累量,分析了各部位的Zn积累量和分配比例。结果表明,外源Zn处理下,灌浆初期至成熟期,小麦植株各部位Zn含量为4.22～174.98μg.g-1,以叶片Zn含量最高。Zn含量的变异主要是外源Zn所导致,品种及品种×外源Zn的互作对各部位Zn含量亦有不同程度的影响。随外源Zn水平的增加,植株干物质积累量呈现先升后降趋势,在200mg.kg-1处理时,植株干物质积累量最高。植株Zn积累总量亦随外源Zn处理浓度的增加而升高,表现为Zn8>Zn4>Zn2>Zn0,周麦18植株Zn积累量高于矮抗58。灌浆初期,植株Zn的主要积累部位是叶片,至成熟期,籽粒和根是Zn的主要积累部位,植株Zn有50%左右分配至籽粒中。在Zn2处理下,籽粒Zn的分配比例最高。土壤中施加适量Zn肥,有利于植株干物质的积累和Zn的吸收积累。
In order to study the effects of exogenous Zn on Zn absorption and accumulation of winter wheat in later growth stage,pot experiments were arranged in green-house during 2009-2010 with experimental materials of Zhoumai-18 and Aikang-58,two popular wheat varieties at present in Henan.Zn concentrations in cultivating soils were 4 levels of 0,200,400 and 800 mg·kg-1,and indicated as Zn0,Zn2,Zn4 and Zn8,respectively.Zn concentration and dry matter weight in different organs in early filling stage and mature stage were measured to calculate the Zn accumulation amount and distribution ratio.The results indicated that Zn concentration in wheat organs ranged from 4.22 to 174.98μg·g-1,and Zn concentration in leaves tended to be the highest among all the organs.The variation of Zn concentration in organs was mainly due to exogenous Zn treatment,while the effects of variety and the interaction of variety × exogenous Zn would not be neglected.Exogenous Zn application could enhance dry matter accumulation in wheat significantly.However,excess Zn fertilizer lowered dry matter accumulation.In this paper,Zn concentration of 200 mg·kg-1 was the most appropriate level to the accumulation of dry matter.Total Zn accumulation amount in wheat enhanced with the increase of exogenous Zn level,and the order of Zn accumulation could be described as Zn8 Zn4 Zn2Zn0.In this experiment,Zn accumulation in wheat of Zhoumai-18 was higher than that in Aikang-58.At early grain-filling stage,Zn accumulation in leaves was the highest.At mature stage,the main organs of higher Zn distribution ratio were grains and roots.And about 50% of Zn accumulation in wheat was distributed in grains,the distribution ratio of Zn in grains tended to be the highest under Zn2 treatment.From the above,appropriate Zn application in soils could promote the accumulation of dry matter and Zn,and it was benefit for grain yield and quality of wheat.
出处
《麦类作物学报》
CAS
CSCD
北大核心
2011年第6期1099-1106,共8页
Journal of Triticeae Crops
基金
国家十二五科技支撑计划项目(2011BAD16B14)
河南省重大科技专项(081100110200)
河南师范大学大学生创新性实验计划项目(091047635)
关键词
冬小麦
外源Zn
Zn积累与分配
Winter wheat
Exogenous Zn
Zn accumulation and distribution
