Drought was maintain ed in pot raised plants by
N2 - Insects and drought cause severe losses in the production of maize in many developing countries. Conventional breeding efforts to enhance the level of resistance to a number of insect pests and tolerance to drought have been successful, although only through large efforts of many breeders and over a large period of time. Continued improvements will only be possible through substantial investment of resources. Recently, success in identifying quantitative trait loci (QTL) in several plant species using various molecular marker systems offers alternative methods for accelerating conventional breeding programs. As the first step towards using molecular markers in CIMMYT's maize breeding program, restriction fragment length polymorphisms (RFLPs) have been used to understand the genetic basis of resistance to two corn borer species, southwestern corn borer and sugarcane borer, and to one major component of drought tolerance, anthesis-silking interval. A number of QTL with effects large enough to be regarded as significant in breeding were detected for each of these traits and many of them presented stable effects over environments. While variability in the number and location of QTL has been found when compared across populations, several loci were found to be quite consistent. Simple calculations can be made which estimate that the total genetic potential in maize for these traits is high. It is argued that to ultimately access and manipulate this potential, the use of linked molecular markers as indirect selectable markers is both feasible and necessary.
Secondary traits for maize grain yield under drought stress
Anthesis to Silking Interval Usefulness in Developing Drought Maydica
Vargas M, van Eeuwijk FA, Crossa J, Ribaut JM, 2006. Mapping QTLs and QTL× environment interaction for CIMMYT maize drought stress program using factorial regression and partial least squares methods. Theor Appl Genet 112: 1009-1023.
PHENOTYPING FOR ABIOTIC STRESS TOLERANCE IN MAIZE DROUGHT STRESS
A short ASI has been identified as an easily measured.
The positions of the 68 mQTL for grain yield and anthesis silking interval.
Anthesis to Silking Interval Usefulness in Developing Drought Tolerant Maize.