Estimation of Heritability of the Nectar Guide of Flowers in Brassica rapa L.
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概要
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Flowers of Brassica rapa L. produce a nectar guide, which consists of a coloured pattern (the dark, UV-absorbing centre of the flower) invisible to humans but visible to insect pollinators. As a result, the colour of the flowers typically appears as uniform light yellow to human eyes. The objective of the present study was to investigate the mode of inheritance of this character by using two inbred lines and their F_1, F_2 and F_3 progenies with a view to improving this character. After digitizing UV-photographs of each flower, we measured the UV-absorbing area (UVA) and the total flower area (FA), based on image analysis. The ratio of UVA to FA represented the UV colour proportion (UVP). We estimated the broad-sense and narrow-sense heritabilities from within-generation variances in the UVP scores and environmental variance from the average value of the variances in the parental lines. The value of broad-sense heritability of UVP was high (0.75) in the F_2 generation (h_B^2 [F_2]) and higher (0.84) in the F_3 generation (h_B^2 [F_3]), indicating that UVP is a heritable character. Moreover, the high value of broad-sense heritability of UVP indicates that breeders have not focused their selection intentionally on this character in B. rapa. In contrast, the value of narrow-sense heritability was much lower: 0.12 (h_N^2 [F^2]) and 0.24 (h_N^2 [F_3]), respectively, suggesting that the genetic variation in UVP was mainly due to dominance effects. If we attempt to breed new lines with larger or smaller UVP values, we need to select this trait in advanced generations, in which additive effects become larger.
- 日本育種学会の論文
著者
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Horisaki Atsushi
Tohoku Seed Co. Ltd.
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Niikura Satoshi
Tohoku Seed Co. Ltd.
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Kobayashi Kiwa
Graduate School Of Life And Environmental Sciences University Of Tsukuba
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Horisaki Atsushi
Tohoku Seed Company
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Ohsawa Ryo
Graduate School of Life and Environmental Sciences, University of Tsukuba
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Yoshioka Yosuke
Graduate School of Life and Environmental Sciences, University of Tsukuba
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Yoshioka Yosuke
National Inst. Of Vegetable And Tea Sci. National Agriculture And Food Res. Organization
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Niikura Satoshi
Tohoku Seed Company
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Niikura Satoshi
Tohoku Seed Co.
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Yoshioka Yosuke
Graduate School Of Life And Environmental Sciences University Of Tsukuba
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Ohsawa Ryo
Graduate School Of Life And Environmental Sciences Univ. Of Tsukuba
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