Adaptive responses of quinoa to diverse agro - ecological environments along an altitudinal gradient in North West Argentina
Quinoa is an important Andean grain crop grown in a wide range of tropical and temperate environments.Time to flowering is an important trait determining grain yield. This work aimed to understand howresponses to photoperiod and temperature might alter plant leaf and floral development. To assess thelikely degree of G × E interactions, eleven quinoa accessions from a wide range of environments of originwithin Northwest Argentina were grown in several sowing dates over two seasons at a high altitude site. In a third season at a low altitude site, a subset of six accessions planted in pots in the field was exposedto two artificially extended and a control [natural] photoperiod. Time to the appearance of floral budsand anthesis were recorded as was leaf number. A photothermal model developed for quinoa was usedto compare responses to photoperiod. Plant development rates to visible floral buds and anthesis stagesand phyllochron varied widely amongst accessions and across environments within a short day responsethough phyllochron varied mostly during the reproductive phase. There was a very strong associationbetween time to flowering and altitude of origin [r = -0.98], mean temperature of the wettest quarter[r = 0.98] and Normalized Difference Vegetation Index values [r = 0.73]. Photoperiod sensitivity was higherfor accessions from the lowlands [normally late flowering], while temperature sensitivity was greatestfor accessions from the highlands [early flowering]; most variation for these traits detected at the specieslevel was found in North West Argentina. Genotype by environment interactions for yield were relatedto the traits examined in this study and considering their high heritability it is suggested that quinoa breeding programs targeted for specific adaptation to a wide range of environments can be developedfrom this germplasm.
| Main Authors: | , , , , |
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| Format: | Texto biblioteca |
| Language: | eng |
| Subjects: | CHENOPODIUM QUINOA WILLD, FLOWERING, PHYLLOCHRON, GENOTYPE, ENVIRONMENT INTERACTION, |
| Online Access: | http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=47369 http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber= |
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