Pronozin AY, Paulish AA, Zavarzin EA, Prikhodko AY, Prokhoshin NM, Kruchinina YV, Goncharov NP, Komyshev EG, Genaev MA. Automatic morphology phenotyping of tetra- and hexaploid wheat spike using computer vision methods.
Vavilovskii Zhurnal Genet Selektsii 2021;
25:71-81. [PMID:
34901705 PMCID:
PMC8629366 DOI:
10.18699/vj21.009]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/31/2020] [Accepted: 01/02/2021] [Indexed: 11/19/2022] Open
Abstract
Intraspecific classification of cultivated plants is necessary for the conservation of biological diversity,
study of their origin and their phylogeny. The modern cultivated wheat species originated from three wild diploid
ancestors as a result of several rounds of genome doubling and are represented by di-, tetra- and hexaploid species.
The identification of wheat ploidy level is one of the main stages of their taxonomy. Such classification is possible
based on visual analysis of the wheat spike traits. The aim of this study is to investigate the morphological characteristics of spikes for hexa- and tetraploid wheat species based on the method of high-performance phenotyping.
Phenotyping of the quantitative characteristics of the spike of 17 wheat species (595 plants, 3348 images), including
eight tetraploids (Triticum aethiopicum, T. dicoccoides, T. dicoccum, T. durum, T. militinae, T. polonicum, T. timopheevii,
and T. turgidum) and nine hexaploids (T. compactum, T. aestivum, i:ANK-23 (near-isogenic line of T. aestivum cv.
Novosibirskaya 67), T. antiquorum, T. spelta (including cv. Rother Sommer Kolben), T. petropavlovskyi, T. yunnanense,
T. macha, T. sphaerococcum, and T. vavilovii), was performed. Wheat spike morphology was described on the basis
of nine quantitative traits including shape, size and awns area of the spike. The traits were obtained as a result of
image analysis using the WERecognizer program. A cluster analysis of plants according to the characteristics of the
spike shape and comparison of their distributions in tetraploid and hexaploid species showed a higher variability of
traits in hexaploid species compared to tetraploid ones. At the same time, the species themselves form two clusters
in the visual characteristics of the spike. One type is predominantly hexaploid species (with the exception of one
tetraploid, T. dicoccoides). The other group includes tetraploid ones (with the exception of three hexaploid ones,
T. compactum, T. antiquorum, T. sphaerococcum, and i:ANK-23). Thus, it has been shown that the morphological
characteristics of spikes for hexaploid and tetraploid wheat species, obtained on the basis of computer analysis of
images, include differences, which are further used to develop methods for plant classifications by ploidy level and
their species in an automatic mode.
Collapse