engleski

Per se and test-cross performance of the M3S maize population for grain yield and stalk rot resistance after three cycles of recurrent selection

Recurrent selection has been used for improvement of grain yield and disease resistance in genetically broad based populations. Maksimir 3 Synthetic (M3S) maize population was created at the Faculty of Agriculture University of Zagreb by intercrossing 12 domestic inbred lines showing good combining ability with both BSSS and Lancaster testers. The population has been subjected to three cycles of recurrent selection to improve grain yield and stalk lodging resistance. In the first two cycles selfed progeny selection were used and in the third cycle S1 and full-sib (FS) selection methods were conducted separately. The original population C0 and four advanced cycle populations C1, C2, C3-S1 and C3-FS, per se and their test crosses with inbred lines B73 and Mo17, were evaluated over three years under natural conditions (NC) and artificial stalk infection (AI) with Colletotrichum graminicola (Ces.) G.W. Wils. In the population per se grain yield increased 10% after two cycles of selection under NC. After the third cycle there was no further improvement in grain yield. Under AI an increase of grain yield was observed only in the third cycle for the FS selection. In the case of test-crosses an increasing trend for grain yield was observed only in crosses with Mo17 under NC. A significant decrease of stalk rot incidence from C0 to C3 was observed for both NC and AI with a higher response for C3-FS than for C3-S1. A significant decrease in stalk rot incidence in test-crosses occurred in the first cycle of selection only.

maize

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