10 research outputs found
Identification of quantitative trait loci associated with resistance to ascochyta blight disease in [P665xMessire] and [Wt10245xWt11238] pea (Pisum sativum L.) mapping populations
Trabajo presentado en el IV International Ascochyta Workshop (Ascochyta 2016), celebrado en Tróia (Portugal) el 10 y 11 de octubre de 2016.Ascochyta blight disease is one of the main constraints for pea cultivation. QTL analysis were
performed in [P665×Messire] and [Wt10245×Wt11238] pea mapping populations to identify the
genomic regions controlling resistance to ascochyta blight. Disease assess
ments were performed
under field conditions during 5 years at Radzików, Poland, using the scale reported by Xue et al.
(1996) (0 –resistant, 9 –susceptible). Average ascochyta disease (AAD) scoring was
2.09 for
[P665×Messire] RIL population, 2.5 for Mes
sire and 1.5 for P665 in 2008. In 2009 (AAD) scoring
for this population was 4.14, 5 for Messire and 3.5 for P665. In 2013 (AAD) scoring was 4.18, 5.5
for Messire and 2.7 for P665. In 2014 (AAD) scoring was 4.05 and 5.0 for Messire. In 2015 (AAD)
rating was 3.98 and 4.8 for Messire. Therefore P665 was more resistant to ascochyta blight than
Messire under our field conditions as reported previously by Fondevilla et al. (2008). Average
ascochyta disease scoring value was higher for [P665×Messire] than for [Wt10245×Wt11238]
population
[(AAD) for population 3.6, 3 for Wt10245 line and 4 for Wt11238 line in 2011, 4.36
for the RIL population, 3.3 for Wt10245 line and 4.9 for Wt11238 line in 2014]. Three QTLs
associated with resistance to ascochyta blight were identified on [P665×Messire] linkage map.
QTLs were not conserved across the years what may be due to the strong influence of
environmental conditions on the measured traits. Seven QTLs associated with resistance in 2011
and four associated with resistance in
2014 were detected in the [Wt10245×Wt11238] population.
Two QTLs were found in the same genomic region in both populations (in LGIIIB, near AA170
and in LGVB, near
Pis_GEN_27_2_1 and
AD280 marker). QTLs in similar intervals were
detected by Carrillo et al.
(2014) in Spanish conditions, suggesting the existence of genetic factors
controlling resistance effective in different genetic backgrounds and environments: one in LGIII
(near AA170 marker) and two in LGV (near AD280 marker0. According to these authors some
genes co-localizing with QTLs may have an interesting role in defense and therefore, they could
be candidate genes involved in resistance to D. pinodes in P665.The study is supported by National Multi-Year Program “Improvement of
domestic sources of plant protein, their production, economy and feeding technologies”.N
The analysis of loci associated with stem lodging and resistance to ascochyta disease in field pea (Pisum sativum L.)
Trabajo presentado en la V Meeting Asociación Española de Leguminosas, AEL (Eucarpia International Symposium on Protein Crops), celebrada en Pontevedra del 4 al 7 de mayo de 2015.Pea (Pisum sativum L.) is one of the most widely grown grain legumes in Europe. Two main constraints in pea cultivation are stem lodging and ascochyta
disease. Both of them may lead to severe yield loss. There are no totally resistant cultivars. Stem lodging and ascochyta disease resistance are quantitative
traits. The QTL analysis for these traits were performed on two pea mapping
populations for which linkage maps were available (Carneval x MP1401 for
lodging resistance and P665 x Messire for ascochyta disease resistance). Common markers were used to compare QTLs localizations in the two pea linkage
maps.N
New data and phylogenetic placement of the enigmatic old world lupin: Lupinus mariae-josephi H. Pascual.
International audienceLupinus mariae-josephi H. Pascual is an intriguing lupin species recently discovered in the Mediterranean region. New data from seed coat micromorphology, cytology, and DNA sequences were generated in order to extend our knowledge on this species and to examine its evolutionary relationships within Lupinus. This species shows morphological similarities with the Mediterranean smooth seeded species of sections Micranthi and Lutei. It shares the same chromosome number 2n = 52 with the latter Old World taxa, but also with unifoliolate lupins from Florida. Besides, L. mariae-josephi exhibited a seed coat micromorphology ''intermediate'' between the rough and the smooth seed coat types. Phylogenetic analyses using ITS and ETS nrDNA spacers, and the LEGCYC1A locus supported L. mariae-josephi as a distinct Old World line, placed out of the Scabrispermae, but without clear placement amongst the Mediterranean smooth-seeded lineages. Unexpectedly, LEGCYC1A data revealed phylogenetic affinities between L. mariae-josephi and L. villosus, a unifoliolate North American lupin that might have experienced a reticulated evolutionary process. All together, the data underline the phylogenetic interest of L. mariae-josephi in Lupinus and the need of additional investigations in order to definitely elucidate its enigmatic status. Moreover, as L. mariaejosephi is one of the rare Old World lupins strictly restricted to poor basic soils, it opens new perspectives of ecological and agronomic interests in the wide areas of poor calcareous soils in the Mediterranean region