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Adaptation of super-sweet maize to cold conditions: mutant×genotype interaction

Published online by Cambridge University Press:  19 April 2010

B. ORDÁS ,
V. M. RODRÍGUEZ ,
M. C. ROMAY ,
R. A. MALVAR ,
A. ORDÁS  and
P. REVILLA
B. ORDÁS
Affiliation:
Misión Biológica de Galicia (CSIC), Apartado 28, 36080Pontevedra, Spain
V. M. RODRÍGUEZ
Affiliation:
Misión Biológica de Galicia (CSIC), Apartado 28, 36080Pontevedra, Spain
M. C. ROMAY
Affiliation:
Misión Biológica de Galicia (CSIC), Apartado 28, 36080Pontevedra, Spain
R. A. MALVAR
Affiliation:
Misión Biológica de Galicia (CSIC), Apartado 28, 36080Pontevedra, Spain
A. ORDÁS
Affiliation:
Misión Biológica de Galicia (CSIC), Apartado 28, 36080Pontevedra, Spain
P. REVILLA*
Affiliation:
Misión Biológica de Galicia (CSIC), Apartado 28, 36080Pontevedra, Spain
*
*To whom all correspondence should be addressed. Email: previlla@mbg.cesga.es
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Summary

Super-sweet maize (shrunken2, sh2) has a longer post-harvest life than standard sweetcorn (sugary1, su1), but is less well-adapted to cold conditions. The objective of the present work was to determine if the replacement of su1 by sh2 alters the combining abilities of sweetcorn inbreds for adaptation to early planting under cold conditions. Two diallel sets of su1 and sh2 near-isogenic inbred lines were evaluated in a cold chamber and by early field planting. For most of the traits related to adaptation, except silking date, there were significant mutant×genotype interactions and the estimates of general combining ability (GCA) of each version of the same inbred were different, probably due to epistasis. Therefore, to widen the genetic base of the super-sweet germplasm for adaptation, conversion of the earliest su1 inbreds to sh2, ignoring other characteristics such as emergence or early vigour in early planting or cold tests, is proposed.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 148 , Issue 4 , August 2010 , pp. 401 - 405
Copyright
Copyright © Cambridge University Press 2010

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