Combined family selection for tolerance to corn reddening

Abstract

Variability and interrelationships of traits in maize population NS 1-275 CRS after one cycle of combined HS-S1 family selection were studied. Independent field experiments with HS and S1 progenies were set up according to an incomplete block design in 2008 and 2009. The basic genetics parameters of zero (C0) and the first cycle of selection (C1) were assessed. The primary selection criterion for the formation of the C1 was grain yield (GY) and grain moisture (GM) and secondary stay green (SG) and stalk lodging (SL). Significant differences in mean values between selection cycles (P£0.05) were determined for SG at S1 progenies and GY and SG at HS progenies. No significant changes in genetic variances were recorded after one cycle of selection. Positive correlations between GY and SG and negative between SG and SL exclude the occurrence of negative correlative response. In the upcoming period, some other agronomic traits have to be analyzed to get complete picture of their complex interrelationships, as well as the expected changes through cycles of selection.

U radu je ispitivana varijabilnost i međuzavisnost svojstava u populaciji kukuruza NS 1-275 CRS nakon jednog ciklusa kombinovane HS-S1 familijske selekcije. Nezavisni ogledi sa HS i S1 potomstvima postavljeni su po nekompletnom blok dizajnu tokom 2008. i 2009. Ocenjeni su osnovni genetički parametri nultog (C0) i prvog (C1) ciklusa selekcije. Primarni selekcioni kriterijum za formiranje C1 bio je prinos zrna (GY) i sadržaj vlage u zrnu (GM), a sekundarni stay green (SG) i poleganje stabla (SL). Signifikantne razlike u srednjim vrednostima između ciklusa selekcije (P£0,05) ustanovljene su za SG kod S1 potomstava i GY i SG kod HS potomstava. Nakon jednog ciklusa selekcije nije došlo do značajnih promena u visini genetičke varijanse svojstava. Pozitivne korelacije između GY i SG i negativne između SG i SL isključuju pojavu nepoželjnih korelativnih odgovora. U narednom periodu analizom treba obuhvatiti veći broj agronomskih svojstava kako bi se dobila potpunija slika njihovih kompleksnih odnosa i očekivanih promena kroz cikluse selekcije.