Inheritance of root regrowth as an indicator of apparent aluminum tolerance in triticale |
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Authors: | Xianguang Zhang Robin S Jessop Frank Ellison |
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Institution: | (1) Division of Agronomy and Soil Science, University of New England, Armidale, NSW 2351, Australia;(2) The University of Sydney, Plant Breeding Institute –, Narrabri, NSW 2390, Australia |
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Abstract: | Aluminum (Al) toxicity is a predominant growth-limiting factor in acid soils. Better understanding of the genetic mechanisms
by which plants tolerate toxic Al expedites the development of tolerant plant genotypes. The genetic behavior of apparent
Al tolerance in two triticale crosses as measured by root regrowth of seedlings at a level of 10 μg · g−1 Al stress in nutrient solutions was analyzed by following a bi-parental (BIP) mating design. The validity of the additive-dominance
genetic model was tested with relevant gene effects estimated. The continuous variation of regrown root length showed that
apparent Al tolerance was a metrical character in nature. Both the additive and dominance effects were responsible while the
additive effects played a major role in the expression of Al tolerance. Non-allelic interaction (or epistasis) was indicated
from the inadequacy of the model and different types of epistatic gene effects were detected in the two crosses. These results
suggest that Al tolerance was of polygenic system rather than simply inherited. One to three pairs of genes were involved
in apparent Al tolerance for the parental difference. The moderately high value of estimates of heritability together with
the estimates of genetic advance (GA) could be used in planning a selective breeding program aimed at greater Al tolerance.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | aluminum tolerance bi-parental mating design gene effects genetic parameters root regrowth triticale |
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