Indian Society of Genetics & Plant Breeding

Assessment of distinctiveness, uniformity and stability of basmati rice (Oryza sativa L.) varieties based on morphological descriptors

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Eighteen basmati rice varieties were characterized using
morphological descriptors adopted from the DUS
guidelines of PPV & FR Authority and subsequently
examined for their Distinctiveness, Uniformity and
Stability. Among the 46 visually assessed characters 26
characters were monomorphic, 11 characters were
dimorphic and seven characters were polymorphic
indicating their potential for varietal characterization and
distinctiveness. No intra-varietal variation was observed
for any of the visual characteristics and expression of
characters in different varieties remained same for the two
consecutive years confirming the uniformity and stability
of the varieties. Combined Over Years Distinctiveness
(COY-D) analysis was made on 14 measurable DUS
descriptors which revealed distinctiveness for all varieties
with respect to each other. COY-D analysis was
complemented with MJRA analysis. The slope of the MJRA
curves in both the years and regression coefficients
indicated that all the considered characters were not
completely independent and they are interacting with each
other as well as with environment. Combined Over Years
Uniformity (COY-U) analysis for five of the measurable
characteristics revealed that 15 out of 18 varieties were
almost uniform for the characters under study. However
the other three varieties were non-uniform for one or two
characters emphasizing the need for their further
purification to attain a considerable level of homogeneity
in their heterogeneous blend. On the basis of grouping
characteristics unique morphological profiles could be
established for seven varieties. When all the 60
morphological descriptors were studied two more varieties
could be distinguished. Thus the morphological DUS
descriptors could establish distinctiveness of some
varieties but varieties showing overlapping of the
expression for these characters could not be discriminated
hence some other markers/ descriptors could be
considered for complementing the morphological DUS
descriptors for establishing the distinctiveness.

Keywords: Rice, DUS descriptors, Combined Over Years Distinctiveness, Combine Over Years Uniformity, basmati varieties.


Year: 2010
Volume: 70
Issue: 1
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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