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Establishment of a grafted overhead-sweetpotato cultivation system with root-function spatial division

文献类型： 外文期刊

作者： Li, Ming 1 ; Peng, Meifang 1 ; Fu, Yufan 2 ; Pu, Zhigang 1 ; Tan, Wenfang 3 ; Wang, Dayi 3 ; Yan, Wenzhao 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Inst Biotechnol & Nucl Technol, Chengdu 610061, Peoples R China

2.Southwest Univ, Engn & Technol Res Ctr Sweetpotato Chongqing, Sch Life Sci, Chongqing 400715, Peoples R China

3.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu 610066, Peoples R China

关键词： Ipomoea batatas;Grafted overhead-sweetpotato cultivation;Root-function spatial division;Convolvulaceae;Stock

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

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收录情况： SCI

摘要： We report here a new cultivation system for sweetpotato [Ipomoea batatas (L) Lam.] production, named grafted overhead-sweetpotato cultivation (GOSC) system. In this system, sweetpotato (as scions) was grafted with convolvulaceae relatives (as stocks), and the stems of grafted sweetpotato were buried in a solid medium without any nutrient and hung in the air to regenerate overhead-sweetpotato (storage roots). The results showed that Ipomoea trifida (6x), Beinong5521 (5x) and SH-2 (6x) were the best stocks. All the tested sweetpotato cultivars could produce overhead-sweetpotato with different yields. The mixture of sand, perlite and vermiculite with a 1:1:1 (v/v/v) ratio was the best solid medium for the GOSC system. The key stage of overhead-sweetpotato formation was about 20 days to 55 days after stem buried. Since storage roots are not regenerated from stocks grown in fertilized soil but from scion stems buried in non-fertilized solid medium, it seemed that the grafted overhead-sweetpotato plants had root-function spatial division (RFSD), i.e. absorbing roots of stocks and storage roots of scions. The graft compatibility with sweetpotato, the stock without underground storage roots, and the stem-buried media without nutrient supply, are the key factors for RFSD and overhead-sweetpotato production. This system could be used as a model for the study of the interaction between stock and scion as well as the source-sink relationship in sweetpotato. (C) 2014 Elsevier B.V. All rights reserved.

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