Localized supply of phosphorus induces root morphological and architectural changes of rice in split and stratified soil cultures

被引:90
作者
He, Y
Liao, H
Yan, XL [1 ]
机构
[1] S China Agr Univ, Lab Plant Nutr Genet, Guangzhou, Peoples R China
[2] S China Agr Univ, Root Biol Ctr, Guangzhou, Peoples R China
基金
中国国家自然科学基金;
关键词
localized phosphorus supply; rice; root architecture; root morphology;
D O I
10.1023/A:1022351203545
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
A localized supply of phosphorus may affect root morphology and architecture, and thereby affect phosphorus uptake by rice plants. In the present study, we attempted to test this hypothesis using two rice cultivars representing upland and lowland ecotypes grown in specially designed split and stratified soil cultures with a low-phosphorus red soil. Our data indicate that a localized supply of phosphorus increased both total root length and root fineness, particularly in the high-phosphorus zone. In split culture, plants roots tended to preferentially grow on the high-phosphorus zone, with about 70-75% of the total root length allocated to the high-phosphorus compartment. The total root length on the high-phosphorus side in the split-phosphorus treatment was significantly longer than that in the homogenously high-phosphorus treatment, implying that a phosphorus-deficiency signal from the low-phosphorus side may stimulate the growth of the roots located in the high-phosphorus zone. In stratified soil culture, changes in root morphology and architecture were also observed as indicated by increased total root length, root fineness and relative root allocation in the high-phosphorus layers, again suggesting altered root morphology and preferential root proliferation in the high-phosphorus regions. The induced changes in root morphology and architecture by localized phosphorus supply may have both physiological significance and practical implications in that plants can meet the demand for phosphorus with parts of the roots reaching the high-phosphorus zone, hence localized fertilization methods such as side dressing or banded application of phosphorus fertilizers may both minimize phosphorus fixation by the soil and increase phosphorus uptake efficiency from the fertilizers.
引用
收藏
页码:247 / 256
页数:10
相关论文
共 24 条
[1]  
[Anonymous], PLANT SOIL
[2]  
BARUM SM, 1995, THESIS U WISCONSON M
[3]   Stimulation of root hair elongation in Arabidopsis thaliana by low phosphorus availability [J].
Bates, TR ;
Lynch, JP .
PLANT CELL AND ENVIRONMENT, 1996, 19 (05) :529-538
[4]   Effect of phosphorus deficiency on growth angle of basal roots in Phaseolus vulgaris [J].
Bonser, AM ;
Lynch, J ;
Snapp, S .
NEW PHYTOLOGIST, 1996, 132 (02) :281-288
[5]   The down-regulation of Mt4-like genes by phosphate fertilization occurs systemically and involves phosphate translocation to the shoots [J].
Burleigh, SH ;
Harrison, MJ .
PLANT PHYSIOLOGY, 1999, 119 (01) :241-248
[6]   CITRIC-ACID EXCRETION AND PRECIPITATION OF CALCIUM CITRATE IN THE RHIZOSPHERE OF WHITE LUPIN (LUPINUS-ALBUS L) [J].
DINKELAKER, B ;
ROMHELD, V ;
MARSCHNER, H .
PLANT CELL AND ENVIRONMENT, 1989, 12 (03) :285-292
[7]  
DREW MC, 1978, J EXP BOT, V29, P435, DOI 10.1093/jxb/29.2.435
[8]   NUTRIENT SUPPLY AND GROWTH OF SEMINAL ROOT SYSTEM IN BARLEY .2. LOCALIZED, COMPENSATORY INCREASES IN LATERAL ROOT GROWTH AND RATES OF NITRATE UPTAKE WHEN NITRATE SUPPLY IS RESTRICTED TO ONLY PART OF ROOT SYSTEM [J].
DREW, MC ;
SAKER, LR .
JOURNAL OF EXPERIMENTAL BOTANY, 1975, 26 (90) :79-90
[9]  
FOHSE D, 1991, PLANT SOIL, V132, P261
[10]   Direct evidence on participation of root hairs in phosphorus (32P) uptake from soil [J].
Gahoonia, TS ;
Nielsen, NE .
PLANT AND SOIL, 1998, 198 (02) :147-152