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Genetic determinism of anatomical and hydraulic traits within an apple progeny
Author(s) -
LAURI PIERREÉRIC,
GORZA OLIVIER,
COCHARD HERVÉ,
MARTINEZ SÉBASTIEN,
CELTON JEANMARC,
RIPETTI VÉRONIQUE,
LARTAUD MARC,
BRY XAVIER,
TROTTIER CATHERINE,
COSTES EVELYNE
Publication year - 2011
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.2011.02328.x
Subject(s) - trait , biology , xylem , quantitative trait locus , principal component analysis , hydraulic conductivity , genetic analysis , botany , horticulture , microbiology and biotechnology , genetics , ecology , gene , statistics , soil water , mathematics , computer science , programming language
The apple tree is known to have an isohydric behaviour, maintaining rather constant leaf water potential in soil with low water status and/or under high evaporative demand. However, little is known on the xylem water transport from roots to leaves from the two perspectives of efficiency and safety, and on its genetic variability. We analysed 16 traits related to hydraulic efficiency and safety, and anatomical traits in apple stems, and the relationships between them. Most variables were found heritable, and we investigated the determinism underlying their genetic control through a quantitative trait loci (QTL) analysis on 90 genotypes from the same progeny. Principal component analysis (PCA) revealed that all traits related to efficiency, whether hydraulic conductivity, vessel number and area or wood area, were included in the first PC, whereas the second PC included the safety variables, thus confirming the absence of trade‐off between these two sets of traits. Our results demonstrated that clustered variables were characterized by common genomic regions. Together with previous results on the same progeny, our study substantiated that hydraulic efficiency traits co‐localized with traits identified for tree growth and fruit production.