Genetic Improvement of Root Growth Contributes to Efficient Phosphorus Acquisition in maize (Zea mays L.)
Maize plants adapt to low phosphorus (P) stress by increasing root growth. It is of importance to know the extent to which genetic improvement of root growth can enhance P acquisiton. In the present study, the contribution of root growth improvement to efficient P acquisition was evaluated in two so...
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| Format: | Article |
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KeAi Communications Co., Ltd.
2013-06-01
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| Series: | Journal of Integrative Agriculture |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S209531191360489X |
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| author | Yi-kai ZHANG Fan-jun CHEN Xiao-chao CHEN Li-zhi LONG Kun GAO Li-xing YUAN Fu-suo ZHANG Guo-hua MI |
| author_facet | Yi-kai ZHANG Fan-jun CHEN Xiao-chao CHEN Li-zhi LONG Kun GAO Li-xing YUAN Fu-suo ZHANG Guo-hua MI |
| author_sort | Yi-kai ZHANG |
| collection | DOAJ |
| description | Maize plants adapt to low phosphorus (P) stress by increasing root growth. It is of importance to know the extent to which genetic improvement of root growth can enhance P acquisiton. In the present study, the contribution of root growth improvement to efficient P acquisition was evaluated in two soils using T149 and T222, a pair of near isogenic maize testcrosses which were derived from a backcross BC4F3 population. T149 and T222 showed no difference in shoot biomass and leaf area under normal growth conditions, but differed greatly in root growth. T149 had longer lateral roots and a larger root surface area compared to T222. In calcareous soil, when P was insufficient, i.e., when P was either supplied as KH2PO4 at a concentration of 50 mg P kg−1 soil, or in the form of Phy-P, Ca3-P or Ca10-P, a 43% increase in root length in T149 compared to T222 resulted in an increase in P uptake by 53%, and shoot biomass by 48%. In acid soil, however, when P supply was insufficient, i.e., when P was supplied as KH2PO4 at a concentration of 100 mg P kg−1 soil, or in the form of Phy-P, Fe-P or Al-P, a 32% increase in root length in T149 compared to T222 resulted in an increase in P uptake by only 12%, and shoot biomass by 7%. No significant differences in the exudation of organic acids and APase activity were found between the two genotypes. It is concluded that genetic improvement of root growth can efficiently increase P acquisition in calcareous soils. In acid soils, however, improvements in the physiological traits of roots, in addition to their size, seem to be required for efficient P acquisition. |
| format | Article |
| id | doaj-art-659c63f39cd644ddb98a54d44d5a4aa1 |
| institution | Matheson Library |
| issn | 2095-3119 |
| language | English |
| publishDate | 2013-06-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Integrative Agriculture |
| spelling | doaj-art-659c63f39cd644ddb98a54d44d5a4aa12025-08-02T09:45:29ZengKeAi Communications Co., Ltd.Journal of Integrative Agriculture2095-31192013-06-0112610981111Genetic Improvement of Root Growth Contributes to Efficient Phosphorus Acquisition in maize (Zea mays L.)Yi-kai ZHANG0Fan-jun CHEN1Xiao-chao CHEN2Li-zhi LONG3Kun GAO4Li-xing YUAN5Fu-suo ZHANG6Guo-hua MI7ZHANG Yi-kai, Mobile: 13732279586; Key Laboratory of Plant-Soil Interactions, Ministry of Education/Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, P.R. ChinaKey Laboratory of Plant-Soil Interactions, Ministry of Education/Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, P.R. ChinaKey Laboratory of Plant-Soil Interactions, Ministry of Education/Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, P.R. ChinaKey Laboratory of Plant-Soil Interactions, Ministry of Education/Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, P.R. ChinaKey Laboratory of Plant-Soil Interactions, Ministry of Education/Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, P.R. ChinaKey Laboratory of Plant-Soil Interactions, Ministry of Education/Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, P.R. ChinaKey Laboratory of Plant-Soil Interactions, Ministry of Education/Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, P.R. ChinaCorrespondence MI Guo-hua, Tel: +86-10-62734454, Fax: +86-10-62731016; Key Laboratory of Plant-Soil Interactions, Ministry of Education/Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, P.R. ChinaMaize plants adapt to low phosphorus (P) stress by increasing root growth. It is of importance to know the extent to which genetic improvement of root growth can enhance P acquisiton. In the present study, the contribution of root growth improvement to efficient P acquisition was evaluated in two soils using T149 and T222, a pair of near isogenic maize testcrosses which were derived from a backcross BC4F3 population. T149 and T222 showed no difference in shoot biomass and leaf area under normal growth conditions, but differed greatly in root growth. T149 had longer lateral roots and a larger root surface area compared to T222. In calcareous soil, when P was insufficient, i.e., when P was either supplied as KH2PO4 at a concentration of 50 mg P kg−1 soil, or in the form of Phy-P, Ca3-P or Ca10-P, a 43% increase in root length in T149 compared to T222 resulted in an increase in P uptake by 53%, and shoot biomass by 48%. In acid soil, however, when P supply was insufficient, i.e., when P was supplied as KH2PO4 at a concentration of 100 mg P kg−1 soil, or in the form of Phy-P, Fe-P or Al-P, a 32% increase in root length in T149 compared to T222 resulted in an increase in P uptake by only 12%, and shoot biomass by 7%. No significant differences in the exudation of organic acids and APase activity were found between the two genotypes. It is concluded that genetic improvement of root growth can efficiently increase P acquisition in calcareous soils. In acid soils, however, improvements in the physiological traits of roots, in addition to their size, seem to be required for efficient P acquisition.http://www.sciencedirect.com/science/article/pii/S209531191360489XP efficiencyrootslow phosphoruscalcareous soilacid soilmaize |
| spellingShingle | Yi-kai ZHANG Fan-jun CHEN Xiao-chao CHEN Li-zhi LONG Kun GAO Li-xing YUAN Fu-suo ZHANG Guo-hua MI Genetic Improvement of Root Growth Contributes to Efficient Phosphorus Acquisition in maize (Zea mays L.) Journal of Integrative Agriculture P efficiency roots low phosphorus calcareous soil acid soil maize |
| title | Genetic Improvement of Root Growth Contributes to Efficient Phosphorus Acquisition in maize (Zea mays L.) |
| title_full | Genetic Improvement of Root Growth Contributes to Efficient Phosphorus Acquisition in maize (Zea mays L.) |
| title_fullStr | Genetic Improvement of Root Growth Contributes to Efficient Phosphorus Acquisition in maize (Zea mays L.) |
| title_full_unstemmed | Genetic Improvement of Root Growth Contributes to Efficient Phosphorus Acquisition in maize (Zea mays L.) |
| title_short | Genetic Improvement of Root Growth Contributes to Efficient Phosphorus Acquisition in maize (Zea mays L.) |
| title_sort | genetic improvement of root growth contributes to efficient phosphorus acquisition in maize zea mays l |
| topic | P efficiency roots low phosphorus calcareous soil acid soil maize |
| url | http://www.sciencedirect.com/science/article/pii/S209531191360489X |
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