Growth, Nitrogen Uptake and Flow in Maize Plants Affected by Root Growth Restriction

被引:14
作者
Xu, Liangzheng [1 ,2 ]
Niu, Junfang [3 ]
Li, Chunjian [1 ]
Zhang, Fusuo [1 ]
机构
[1] China Agr Univ, Dept Plant Nutr, Key Lab Plant Nutr, Minist Agr, Beijing 100193, Peoples R China
[2] Jiaying Univ, Sch Life Sci, Meizhou 514015, Peoples R China
[3] Chinese Acad Sci, Ctr Agr Resources, Inst Genet & Dev Biol, Shijiazhuang 050021, Peoples R China
关键词
nitrogen flow; nitrogen uptake; root system components; Zea mays; RICINUS-COMMUNIS L; ABSCISIC-ACID; SHOOT GROWTH; NODAL ROOTS; XYLEM; NUTRIENTS; POTASSIUM; TRANSPORT; SYSTEM; ZEA;
D O I
10.1111/j.1744-7909.2009.00843.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The objective of the present study was to investigate the influence of a reduced maize root-system size on root growth and nitrogen (N) uptake and flow within plants. Restriction of shoot-borne root growth caused a strong decrease in the absorption of root: shoot dry weight ratio and a reduction in shoot growth. On the other hand, compensatory growth and an increased N uptake rate in the remaining roots were observed. Despite the limited long-distance transport pathway in the mesocotyl with restriction of shoot-borne root growth, N cycling within these plants was higher than those in control plants, implying that xylem and phloem flow velocities via the mesocotyl were considerably higher than in plants with an intact root system. The removal of the seminal roots in addition to restricting shoot-borne root development did not affect whole plant growth and N uptake, except for the stronger compensatory growth of the primary roots. Our results suggest that an adequate N supply to maize plant is maintained by compensatory growth of the remaining roots, increased N uptake rate and flow velocities within the xylem and phloem via the mesocotyl, and reduction in the shoot growth rate.
引用
收藏
页码:689 / 697
页数:9
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