caa a22 4500 445323728 CHVBK 20180317142713.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10681-010-0273-1 doi (NATIONALLICENCE)springer-10.1007/s10681-010-0273-1 Genetic distance and hybrid value in tropical maize under P stress and non stress conditions in acid soils [Elektronische Daten] [M. George, F. Salazar, M. Warburton, L. Narro, F. Vallejo] An emphasis in maize breeding for areas with acid soils is the development of varieties with tolerance to P-deficiency plus high yield potential in acidic as well as normal soils. This study was carried out to assess the (i) genetic diversity within a set of tropical inbred lines developed from acid soil-tolerant populations; (ii) F1 yield performance, mid-parent heterosis (MPH), high-parent heterosis (HPH), and specific combining ability (SCA) in a diallel set of crosses under P stress (low P) and non-stress (high P) conditions; and (iii) the effect of P stress on the relationship between genetic distance (GD) and hybrid performance. Using field evaluation and molecular marker studies, the results show that these germplasm from the South American maize breeding program of CIMMYT for improving tolerance to acid soils had only a moderate level of genetic diversity. The utility of GD as a predictor of hybrid value is best up to a certain threshold, as correlations with GD became inconsistent when the inbred parents were greatly divergent. There was no correlation between GD and F1 grain yield, MPH, HPH and SCA when the GD was >0.77. The high correlation of GD with F1 grain yield and with SCA in specific subsets of crosses having a narrower range of GD shows that GD can be put to practical use in predicting hybrid performance. The highest correlation between GD and SCA, seen in the subset of crosses between lines within a cluster, was reasonably stable even when the environment had a severe effect on yield. Springer Science+Business Media B.V., 2010 Maize nationallicence Genetic distance nationallicence Heterosis nationallicence Acid soils nationallicence P stress nationallicence George M. CIMMYT Int, Project Management Unit, Apdo. Postal 6-641, 06600, Mexico, DF, Mexico aut Salazar F. Centro de Investigacion de la Caña de Azucar de Colombia, Calle 58 Norte No. 3BN-110, Cali, Colombia aut Warburton M. USDA-ARS, Dorman Hall - Stone Boulevard, 39762, Mississippi State, MS, USA aut Narro L. Global Maize Program, CIMMYT-Colombia, c/o CIAT, Apdo. Aereo 67-13, Cali, Colombia aut Vallejo F. Universidad Nacional de Colombia, Apdo. Aereo 237, Colombia, Palmira, Colombia aut Euphytica Springer Netherlands 178/1(2011-03-01), 99-109 0014-2336 178:1<99 2011 178 10681 https://doi.org/10.1007/s10681-010-0273-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10681-010-0273-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- George M. CIMMYT Int, Project Management Unit, Apdo. Postal 6-641, 06600, Mexico, DF, Mexico aut NATIONALLICENCE 700 1- Salazar F. Centro de Investigacion de la Caña de Azucar de Colombia, Calle 58 Norte No. 3BN-110, Cali, Colombia aut NATIONALLICENCE 700 1- Warburton M. USDA-ARS, Dorman Hall - Stone Boulevard, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 700 1- Narro L. Global Maize Program, CIMMYT-Colombia, c/o CIAT, Apdo. Aereo 67-13, Cali, Colombia aut NATIONALLICENCE 700 1- Vallejo F. Universidad Nacional de Colombia, Apdo. Aereo 237, Colombia, Palmira, Colombia aut NATIONALLICENCE 773 0- Euphytica Springer Netherlands 178/1(2011-03-01), 99-109 0014-2336 178:1<99 2011 178 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer