Prediction of the heterosis of <Emphasis Type="Italic">Laminaria</Emphasis> hybrids with the genetic distance between their parental gametophyte clones |
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Authors: | Xiaojie Li Guanpin Yang Yuanyuan Shi Yizhou Cong Shi Che Shancun Qu Zhiling Li |
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Institution: | (1) College of Marine Life Sciences, Ocean University of China, Qingdao, Shandong, 266003, People’s Republic of China;(2) Shandong Oriental Ocean Sci-tech Co. Ltd., Yantai, Shandong, 264003, People’s Republic of China |
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Abstract: | Eighteen microsatellite markers were used to determine the genetic distances between the parental gametophyte clones of 14
Laminaria hybrids, which were then used to establish a linear relationship with the heterosis (hybrid vigor) of economic traits including
yield, mean blade try weight, mean blade fresh weight, blade length, blade width and mean blade thickness using regression
analysis. Significant regression was found between the genetic distance (x) and the heterosis (y) of yield (y = 115.10x − 77.97,
r = 0.8151, p = 0.00038), mean blade dry weight (y = 115.23x −77.97, r = 0.8154, p = 0.00038), mean blade fresh weight (y = 100.08x − 57.85, r = 0.7306, p = 0.0030) and blade length (y = 204.11x − 46.77, r = 0.6963, p = 0.00566). The prediction of the heterosis of Laminaria hybrids with the genetic distance between parental gametophyte clones will facilitate the selection of elite Laminaria hybrids by avoiding the time-consuming and labor-intensive trait evaluation of a large number of hybridization combinations. |
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Keywords: | Laminaria hybrid Heterosis Hybrid vigor Microsatellite marker Genetic distance Phaeophyta |
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