Root Research
Online ISSN : 1880-7186
Print ISSN : 0919-2182
ISSN-L : 0919-2182
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Volume 12, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • The influences of a root-knot nematode, Meloidogyne incognita, on formation of rootsystem in sweetpotatoes (Ipomoea batatas (L). Lam)
    Masataka YAMASHITA
    2003 Volume 12 Issue 3 Pages 115-118
    Published: September 26, 2003
    Released on J-STAGE: December 18, 2009
    DOIhttps://doi.org/10.3117/rootres.12.115
    JOURNAL FREE ACCESS
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    Influences of nematodes on the growth and formation of root system were studied using sweetpotatoes grown in the framed plots infected with a root-knot nematode, Melidogyne incognia, in 1999. Nematode densities in the infected plot have reached to the level that could raise severe damage to sweetpotato roots by the late August. The growth of top and roots in the infected plot were markedly restricted and the yield of storage roots in October sharply decreased. In the root system of sweetpotatoes in the infected plot, the amount of roots not larger than 1mm in diameter was definitely little. The damage of nematodes to the root system was considered to be not only a reduction in root amount but also a reduction in feeder roots caused by inhibiting the growth of high dimensional lateral roots. It is considered that the change in the structure of root system brought about the retardation of the top growth and moreover, it led to a large reduction in the yield.
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  • Examination of presuming method of the length of the line contained in a space, and the application in investigation of tea plant rootlet
    Ryotaro ONO
    2003 Volume 12 Issue 3 Pages 119-123
    Published: September 26, 2003
    Released on J-STAGE: December 18, 2009
    DOIhttps://doi.org/10.3117/rootres.12.119
    JOURNAL FREE ACCESS
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    We evaluated a method of estimating the total length of roots in a space from the number of the cut ends of roots appearing on the soil profile, to estimate the length of plant roots in soil. The total length of the segments randomly distributed in a space, R, is shown by R=2nV/S; where, V is the volume of the space, S the surface area of the space and n the number of surface crossing of the lines. The total length of the fine roots of tea plants in the field was estimated using this formulas, and was compared with the root length actually measured after dug out. By using this method, the root length could be estimated with a high accuracy.
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  • Root characteristics in salt tolerance
    Ping An, Shinobu Inanaga, Xiangjun Li, Hideyuki Shimizu, Eiichi Tanimo ...
    2003 Volume 12 Issue 3 Pages 125-132
    Published: September 26, 2003
    Released on J-STAGE: December 18, 2009
    DOIhttps://doi.org/10.3117/rootres.12.125
    JOURNAL FREE ACCESS
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    The mechanisms of salt tolerance in plants were reviewed focusing on root characteristics of salt-tolerant cultivars under saline conditions. The salt-tolerant traits were characterized as greater root growth, higher efficiency in water uptake, lower Na+ permeability, better root osmotic adjustment, and higher root pressure. The roles of these characteristics in plant growth and crop production under saline conditions were discussed.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    2003 Volume 12 Issue 3 Pages 133-136
    Published: September 26, 2003
    Released on J-STAGE: December 18, 2009
    DOIhttps://doi.org/10.3117/rootres.12.133
    JOURNAL FREE ACCESS
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