Divergent Selection for Vegetative Phase Change in Maize and Indirect Effects on Response to Puccinia sorghi

In maize (Zea mays L.), some experiments have indicated that early vegetative phase transition is associated with increased resistance to disease, insects, and stalk lodging. The sweet corn population Minn11 was selected over three cycles of divergent recurrent selection for early-phase transition a...

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Bibliographic Details
Published in:	Crop science Vol. 48; no. 3; pp. 992 - 999
Main Authors:	Basso, C.F, Hurkman, M.M, Riedeman, E.S, Tracy, W.F
Format:	Journal Article
Language:	English
Published:	Madison Crop Science Society of America 01-05-2008 American Society of Agronomy
Subjects:	Agronomy. Soil science and plant productions Biological and medical sciences Breeding schemes. Varia Cells Changes Corn Developmental stages divergent selection early development epicuticular wax Fundamental and applied biological sciences. Psychology Genetics Genetics and breeding of economic plants Immunization leaf area leaves Life sciences Lodging phenology Plant breeding: fundamental aspects and methodology plant development Population Puccinia sorghi recurrent selection rust diseases seedlings sweetcorn Tissues vegetable crops vegetative growth Zea mays United States North America Wisconsin America Monocotyledones Zea mays Plant pathogen Vegetative state Cereal crop Fungus resistance Basidiomycota Fungi Puccinia sorghi Gramineae Angiospermae Spermatophyta Developmental stage Divergent selection
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Summary:	In maize (Zea mays L.), some experiments have indicated that early vegetative phase transition is associated with increased resistance to disease, insects, and stalk lodging. The sweet corn population Minn11 was selected over three cycles of divergent recurrent selection for early-phase transition and late-phase transition. Objectives were to determine the effectiveness of divergent recurrent selection and if the divergent selection program was associated with resistance to common rust (Puccinia sorghi). Selection resulted in a significant linear response for last leaf with juvenile wax in both the early and late directions of selection. The third cycle in the late direction (C3L) had two more leaves with juvenile wax than cycle zero (C0). The third cycle in the early direction (C3E) had 1.5 fewer leaves with juvenile wax than C0. To determine the effects of divergent selection for vegetative phase change on response to common rust the populations were inoculated with rust at three developmental times, vegetative stage (v) 5, v10, and v15, and rust damage was rated on leaves 7 through 13 individually, resulting in 21 potential responses for each direction of selection. Among the 21 leaf by developmental stage combinations, there were 9 significant linear trends in the late direction of selection. Most of the linear trends were detected in leaves 7 through 9. Selection for early transition did not affect response to common rust. The amount of leaf area damaged by rust in C3E never differed from the amount in C0.
Bibliography:	http://dx.doi.org/10.2135/cropsci2007.08.0476 All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.
ISSN:	0011-183X 1435-0653
DOI:	10.2135/cropsci2007.08.0476