Interacted Effect of Arbuscular Mycorrhizal Fungi and Polyamines on Root SystemArchitecture of Citrus Seedlings

doi:10.1016/S1671-2927(00)8700

Journal of Integrative Agriculture ›› 2012, Vol. 12 ›› Issue (10): 1675-1681.DOI: 10.1016/S1671-2927(00)8700

Interacted Effect of Arbuscular Mycorrhizal Fungi and Polyamines on Root SystemArchitecture of Citrus Seedlings

WU Qiang-sheng, ZOU Ying-ning, LIU Chun-yan, LU Ting

1.College of Horticulture and Gardening, Yangtze University, Jingzhou 434025, P.R.China

收稿日期:2011-12-06 出版日期:2012-10-01 发布日期:2012-11-12
通讯作者: Correspondence WU Qiang-sheng, Tel: +86-716-8066262, Mobile: 13986717539, Fax: +86-716-8066262, E-mail: wuqiangsh@163.com
基金资助:
This study was supported by the National Natural Science Foundation of China (30800747), the Key Project of Ministry of Education of China (211107) and the Science-Technology Research Project of Hubei Provincial Department of Education, China (Q20111301).

Interacted Effect of Arbuscular Mycorrhizal Fungi and Polyamines on Root SystemArchitecture of Citrus Seedlings

WU Qiang-sheng, ZOU Ying-ning, LIU Chun-yan, LU Ting

1.College of Horticulture and Gardening, Yangtze University, Jingzhou 434025, P.R.China

Received:2011-12-06 Online:2012-10-01 Published:2012-11-12
Contact: Correspondence WU Qiang-sheng, Tel: +86-716-8066262, Mobile: 13986717539, Fax: +86-716-8066262, E-mail: wuqiangsh@163.com
Supported by:
This study was supported by the National Natural Science Foundation of China (30800747), the Key Project of Ministry of Education of China (211107) and the Science-Technology Research Project of Hubei Provincial Department of Education, China (Q20111301).

摘要/Abstract

摘要： Either arbuscular mycorrhizal fungi (AMF) or polyamines (PAs) may change root system architecture (RSA) of plants, whereas the interaction of AMF and PAs on RSA remains unclear. In the present study, we studied the interaction between AMF (Paraglomus occultum) and exogenous PAs, including putrescine (Put), spermidine (Spd) and spermine (Spm) on mycorrhizal development of different parts of root system, plant growth, RSA and carbohydrate concentrations of 6-m-old citrus (Citrus tangerine Hort. ex Tanaka) seedlings. After 14 wk of PAs application, PA-treated mycorrhizal seedlings exhibited better mycorrhizal colonization and numbers of vesicles, arbuscules, and entry points, and the best mycorrhizal status of taproot, first-, second-, and third-order lateral roots was respectively found in mycorrhizal seedlings supplied with Put, Spd and Spm, suggesting that PAs might act as a regulated factor of mycorrhizal development through transformation of root sucrose more into glucose for sustaining mycorrhizal development. AMF usually notably increases RSA traits (taproot length, total length, average diameter, projected area, surface area, volume, and number of first-, second-, and third-order lateral roots) of only PA-treated seedlings. Among the three PA species, greater positive effects on RSA change and plant biomass increment of the seedlings generally rank as Spd>Spm>Put, irrespective of whether or not AMF colonization. PAs significantly changed the RSA traits in mycorrhizal but not in non-mycorrhizal seedlings. It suggests that the application of PAs (especially Spd) to AMF plants would optimize RSA of citrus seedlings, thus increasing plant growth (shoot and root dry weight).

关键词: citrus , lateral root , mycorrhiza , putrescine , root system architecture , spermidine , spermine

Abstract: Either arbuscular mycorrhizal fungi (AMF) or polyamines (PAs) may change root system architecture (RSA) of plants, whereas the interaction of AMF and PAs on RSA remains unclear. In the present study, we studied the interaction between AMF (Paraglomus occultum) and exogenous PAs, including putrescine (Put), spermidine (Spd) and spermine (Spm) on mycorrhizal development of different parts of root system, plant growth, RSA and carbohydrate concentrations of 6-m-old citrus (Citrus tangerine Hort. ex Tanaka) seedlings. After 14 wk of PAs application, PA-treated mycorrhizal seedlings exhibited better mycorrhizal colonization and numbers of vesicles, arbuscules, and entry points, and the best mycorrhizal status of taproot, first-, second-, and third-order lateral roots was respectively found in mycorrhizal seedlings supplied with Put, Spd and Spm, suggesting that PAs might act as a regulated factor of mycorrhizal development through transformation of root sucrose more into glucose for sustaining mycorrhizal development. AMF usually notably increases RSA traits (taproot length, total length, average diameter, projected area, surface area, volume, and number of first-, second-, and third-order lateral roots) of only PA-treated seedlings. Among the three PA species, greater positive effects on RSA change and plant biomass increment of the seedlings generally rank as Spd>Spm>Put, irrespective of whether or not AMF colonization. PAs significantly changed the RSA traits in mycorrhizal but not in non-mycorrhizal seedlings. It suggests that the application of PAs (especially Spd) to AMF plants would optimize RSA of citrus seedlings, thus increasing plant growth (shoot and root dry weight).

Key words: citrus , lateral root , mycorrhiza , putrescine , root system architecture , spermidine , spermine

WU Qiang-sheng, ZOU Ying-ning, LIU Chun-yan, LU Ting. Interacted Effect of Arbuscular Mycorrhizal Fungi and Polyamines on Root SystemArchitecture of Citrus Seedlings[J]. Journal of Integrative Agriculture, 2012, 12(10): 1675-1681.

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Interacted Effect of Arbuscular Mycorrhizal Fungi and Polyamines on Root SystemArchitecture of Citrus Seedlings

Interacted Effect of Arbuscular Mycorrhizal Fungi and Polyamines on Root SystemArchitecture of Citrus Seedlings

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