Root Morphology and Physiology in Relation to the Yield Formation of Rice

doi:10.1016/S1671-2927(00)8614

Journal of Integrative Agriculture ›› 2012, Vol. 12 ›› Issue (6): 920-926.DOI: 10.1016/S1671-2927(00)8614

Root Morphology and Physiology in Relation to the Yield Formation of Rice

YANG Jian-chang, ZHANG Hao, ZHANG Jian-hua

1.Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Agricultural College, Yangzhou University, Yangzhou 225009, P.R.China
2.School of Life Sciences and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, P.R.China

收稿日期:2011-11-21 出版日期:2012-06-01 发布日期:2012-07-20
通讯作者: YANG Jian-chang, Tel/Fax: +86-514-87979317, E-mail: jcyang@yzu.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (31061140457, 31071360), the National Basic Research Program of China (2009CB118603), the Natural Science Foundation of Jiangsu Province, China (BK2009-005), the Key Technologies R&D Program of China during the 12th Five-Year Plan period (2011BAD16B14), the Program of Advantage Discipline of Jiangsu Province, and the Hong Kong Research Grants Council, China (HKBU 262809).

Root Morphology and Physiology in Relation to the Yield Formation of Rice

YANG Jian-chang, ZHANG Hao, ZHANG Jian-hua

1.Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Agricultural College, Yangzhou University, Yangzhou 225009, P.R.China
2.School of Life Sciences and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, P.R.China

Received:2011-11-21 Online:2012-06-01 Published:2012-07-20
Contact: YANG Jian-chang, Tel/Fax: +86-514-87979317, E-mail: jcyang@yzu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (31061140457, 31071360), the National Basic Research Program of China (2009CB118603), the Natural Science Foundation of Jiangsu Province, China (BK2009-005), the Key Technologies R&D Program of China during the 12th Five-Year Plan period (2011BAD16B14), the Program of Advantage Discipline of Jiangsu Province, and the Hong Kong Research Grants Council, China (HKBU 262809).

摘要/Abstract

摘要： Root system is a vital part of plant and regulates many aspects of shoot growth and development. This paper reviews how some traits of root morphology and physiology are related to the formation of grain yield in rice (Oryza sativa L.). Higher root biomass, root oxidation activity, and cytokinin contents in roots are required for achieving more panicle number, more spikelets per panicle, greater grain-filling percentage, and higher grain yield. However, these root traits are not linearly correlated with yield components. When these traits reach very high levels, grain filling and grain yield are not necessarily enhanced. High numbers of mitochondria, Golgi bodies, and amyloplasts in root tip cells benefit root and shoot growth and yield formation. Proper crop management, such as an alternate wetting and moderate soil drying irrigation, can significantly improve ultra-structure of root tip cells, increase root length density and concentration of cytokinins in root bleedings, and consequently, increase grain-filling percentage, grain yield, and water use efficiency. Further studies are needed to investigate the mechanism underlying root-shoot and root-soil interactions for high grain yield, the roles of root-sourced hormones in regulating crop growth and development and the effects of soil moisture and nutrient management on the root architecture and physiology.

关键词: rice (Oryza sativa), root morphology and physiology, grain yield, grain filling, alternate wetting and moderate drying

Abstract: Root system is a vital part of plant and regulates many aspects of shoot growth and development. This paper reviews how some traits of root morphology and physiology are related to the formation of grain yield in rice (Oryza sativa L.). Higher root biomass, root oxidation activity, and cytokinin contents in roots are required for achieving more panicle number, more spikelets per panicle, greater grain-filling percentage, and higher grain yield. However, these root traits are not linearly correlated with yield components. When these traits reach very high levels, grain filling and grain yield are not necessarily enhanced. High numbers of mitochondria, Golgi bodies, and amyloplasts in root tip cells benefit root and shoot growth and yield formation. Proper crop management, such as an alternate wetting and moderate soil drying irrigation, can significantly improve ultra-structure of root tip cells, increase root length density and concentration of cytokinins in root bleedings, and consequently, increase grain-filling percentage, grain yield, and water use efficiency. Further studies are needed to investigate the mechanism underlying root-shoot and root-soil interactions for high grain yield, the roles of root-sourced hormones in regulating crop growth and development and the effects of soil moisture and nutrient management on the root architecture and physiology.

Key words: rice (Oryza sativa), root morphology and physiology, grain yield, grain filling, alternate wetting and moderate drying

YANG Jian-chang, ZHANG Hao, ZHANG Jian-hua. Root Morphology and Physiology in Relation to the Yield Formation of Rice[J]. Journal of Integrative Agriculture, 2012, 12(6): 920-926.

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Root Morphology and Physiology in Relation to the Yield Formation of Rice

Root Morphology and Physiology in Relation to the Yield Formation of Rice

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