Grain yield and breadmaking quality of wheat lines with leaf rust resistance genes Lr29, Lr34, Lr35, and Lr37
Abstract
English: 1. The aim of this study was to determine if the leaf rust resistance genes Lr2g, Lr34,
Lr35 and Lr37 have an effect on the quality and yield characteristics of a cultivar it is
incorporated into.
2. Near-isogenic lines (NIL's) of PalmietlLr2g and PalmietlLr34, as well as of
Karee/Lr2g, Karee/Lr34, Karee/Lr35 and Karee/Lr37 as 'Neil as all relevant parents,
were evaluated for four yield and nine quality characteristics in a field experiment in
the central Free State. The experiment was conducted in a randomised block
design.
3. Results and conclusions:
• The HMW glutenin subunits indicated segregation in BC6, especially in the
Palmiet lines.
• Thatcher and Palmiet lines with Lr29 had significantly lower thousand-kernel
'Neight values compared to their recurrent parents.
• Palmiet NIL's with Lr29 had significantly shorter mixograph mixing time
compared to Palmiet.
• Karee NIL's with the genes Lr34, Lr35 and Lr37 had significantly better PL-ratio's
compared to Karee.
• None of the leaf rust resistance genes used in this study had an influence on all
the quality characteristics and yield components.
• The results suggested that the introduction of foreign genes will not necessarily
result in a yield reduction. The only reduction in yield was observed in Karee
NIL's containing Lr34.
• The two genetic backgrounds responded differently following to incorporation of
the same Lr gene.
• Some sister NIL's performed better than others, which emphasises the
importance of sampling. Afrikaans: 1. Die doel van hierdie studie was om te bepaal of die blaarroes- weerstandspene
Lr29, L34, Lr35 en Lr37 'n effek het op die kwaliteit- en opbrengseienskappe van 'n
kultivar waarin dit geïnkorporeer word.
2. Naby-isogeniese lyne (NIL) van PalmieULr2g en PalmieULr34,sowel as Karee/Lr2g,
Karee/Lr34, Karee/Lr35 en Karee/Lr37 en die relevante ouers, is geëvalueer ten
opsigte van vier opbrengs- en nege kwaliteitseienskappe in 'n veldeksperiment in
die sentrale Vrystaat. Die ekperiment is uitgevoer in 'n gerandomiseerde
blokontwerp en het alle relevante ouers ingesluit.
3. Resultate en gevolgtrekkings:
• HMG glutenien-subeenhede het nog 'n sekere mate van segregasie getoon na
die sesde terugkruising.
• Thatcher en Palmiet lyne met Lr29 het fn betekenisvolle laer duisendkorrelmassa
gehad as hul herhalende ouers.
• Palmiet NIL met Lr29 het 'n betekenisvolle verlaging in mixogram mengtyd
getoon.
• Die Karee NIL met die gene Lr34, Lr35 en Lr37 het almal fn betekenisvolle
verbetering in die PL-verhouding getoon.
• Nie een van die blaarroesweerstandspene wat in die studie gebruik is het 'n
invloed op al die kwaliteitseienskappe of opbrengskomponente gehad nie.
• Die resultate toon dat opbrengs nie noodwendig verlaag word indien gene vanaf
verwante spesies in broodkoringkultivars oorgedra sou word, kon nie bevestig
word nie. Slegs Karee derivate met die Lr34 geen het fn laer opbrengs as Karee
selfgehad.
• Die twee genetiese agtergronde het verskillend gereageer ten opsigte van die
inkorparering van dieselfde Lr geen.
• Sommige suster NIL het beter gevaar as ander vir sekere eienskappe en het dus
is die belang van monstering beklemtoon.
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