Phenotypic and QTL analyses of herbage production-related traits in perennial ryegrass (<Emphasis Type="Italic">Lolium perenne</Emphasis> L.) |
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Authors: | A?M?Sartie H?S?Easton Email author" target="_blank">M?J?FavilleEmail author |
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Institution: | (1) AgResearch Ltd., Grasslands Research Centre, Private Bag 11008, Palmerston North, 4442, New Zealand;(2) Institute of Natural Resources, Massey University PN 433, Private Bag 11222, Palmerston North, 4442, New Zealand;(3) Present address: International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria;(4) c/o IITA Ltd, Carolyn House, 26 Dingwall Road, Croydon, CR9 3EE, UK; |
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Abstract: | Phenotypic and genetic evaluation of morphological traits associated with herbage biomass production was undertaken in a perennial
ryegrass (Lolium perenne L.) biparental F1 mapping population (n = 200) with parent plants from cultivars ‘Grasslands Impact’ and ‘Grasslands Samson’. Morphological traits measured on three
clonal replicates of the parental genotypes and 200 F1 progeny in a glasshouse in two separate trials (autumn and spring) included: dry weight (DW), leaf elongation rate (LER),
initial tiller number (TNs), final tiller number (TNe), site filling (Fs), tiller weight (TW), leaf lamina length, leaf tip
and ligule appearance rates (ALf, ALg) and leaf elongation duration (LED). Principal component analysis of patterns of trait
association identified negative correlation between TNs or TNe, and TW as the primary basis for morphological difference and
indicated that either high LER or long LED could reduce TN. Plants with higher LER tended to have increased DW. Quantitative
trait loci (QTL) were detected on all seven linkage groups (LG) of a perennial ryegrass linkage map for all but three traits.
A total of 61 QTL were identified, many of which clustered at 15 shared genome locations. Significant genotype by environment
effects were encountered, evidenced both by variation between experiments in genotype rankings and by a general lack of commonality
for QTL for the same traits in the different experiments. Only five QTL, for ALf, ALg and TN, were conserved between autumn
and spring trials. A QTL for TN and DW on LG6 is a strong candidate for application of MAS in future plant improvement work
and was found to be co-linear with QTL for equivalent traits reported on chromosome 2 in rice. |
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