A NEW CLASSIFICATION SCHEME FOR GENETICALLY DIVERSEPOPULATIONS OF Heterodera glycines(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:

2002年04期

Page:

301-304

Research Field:

Publishing date:

Info

Title:

A NEW CLASSIFICATION SCHEME FOR GENETICALLY DIVERSEPOPULATIONS OF Heterodera glycines

Author(s):

Xu Yanli¹T.L .Niblack²

1 .Northeast Institute of Geography and Agriculture Ecology , the Chinese Academy of Sciences 150040 ;

2 .University of Illinois at Urbana -Champaign IL 61801

Keywords:

Heterodera glycines ; Nematode ; Races ; Soybean cyst nematode ; Types

PACS:

S 565.1

DOI:

10.11861/j.issn.1000-9841.2002.04.0301

Abstract:

Heterodera glycines , the soybean cyst nematode , is recognized as a major yield -limiting pathogen in mostsoybean production areas worldwide .Field populations of H .glycines exhibit genetic diversity in their parasitism of soybeancultivars with different levels of resistance to the nematode .Since 1970 , this genetic diversity has been characterizedby a bioassay used to assign a race classification to a population .The value of the race scheme is reflected in the numberand quality of highly resistant soybean cultivars that have been developed and released by soybean breeders and nematologistsworking in concert .However , the race scheme also has been misapplied as a means of studying H .glycines genotypes , in part due to the use of the term ”race”.For fungal and bacterial pathogen species , ”race” can theoretically beapplied to individuals of a population , thus allowing inference of individual genotypes , Application of race designation toan individual egg or J2 of H .glycines is not possible because a single second -stage juvenile cannot be increased so itcan be tested on multiple hosts .For other nematode species , ”race” is defined by host ranges involving different hostspecies , whereas the H .glycines race test involves a set of lines of the same species as is true for bacterial and fungalpathogens .Nonetheless , because H .glycines populations vary in genetic diversity , and this variation has implications formanagement strategies , a mechanism is needed for documenting and discussing population differences .In December2000 , a group of nematologists , and soybean breeders geneticists met to discuss possible discriminating schemes .Thescheme described herein avoids the implication of genetic uniformity or predictability in contrast to the way the racescheme has been used

References:

1 　Fujita , K., 0 .Miura .On the parasites of Heterodera schachtii Schmidt onbeans .Trans .Sapporo Nat.Soc.1934 ,13 :359 -364 .

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