The role of exotic germplasm for hybrid maize breeding research
Material type:
TextPublication details: Los Baños, Laguna (Philippines) PCARRD : 2000Description: p. 105-114Subject(s): Summary: Germplasm is critical for assuring continuity of maize breeding activities in the corning century. Lack of germplasm resources is the bottleneck of hybrid maize breeding programs in China. We have introduced and will continue to introduce exotics to broaden the genetic base of hybrid maize breeding and try to enhance the heterosis level. Bi-parental mass selection for early silking is an effective method to improve the adaptation of tropical and subtropical populations to long-day conditions in temperate regions. The adaptability of maize genotypes is associated with photoperiod sensitivity . Four cycles of bi-parental mass selection carried out in Beijing reduced the photoperiod sensitivity in two subtropical populations successfully. The correlated responses of grain yield to selection were positive and significant when evaluated in long-days, but negative when evaluated under short-day condition. This contrast indicates that most of the yield increases were due to the effects of desensitizing germplasm to photoperiod under long-day conditions.
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| Look under series title Public and private partnership in maize research: issues and concerns | Look under series title Supporting the hybrid maize breeding research in Thailand | Look under series title Governmental support for research and development of hybrid maize in Vietnam | Look under series title The role of exotic germplasm for hybrid maize breeding research | Look under series title The evolution of hope: A hierarchical, open-ended breeding system | Look under series title Evolution of inbred line development methodologies in maize | Look under series title Recombinant inbread lines in tropical maize improvement |
Germplasm is critical for assuring continuity of maize breeding activities in the corning century. Lack of germplasm resources is the bottleneck of hybrid maize breeding programs in China. We have introduced and will continue to introduce exotics to broaden the genetic base of hybrid maize breeding and try to enhance the heterosis level. Bi-parental mass selection for early silking is an effective method to improve the adaptation of tropical and subtropical populations to long-day conditions in temperate regions. The adaptability of maize genotypes is associated with photoperiod sensitivity . Four cycles of bi-parental mass selection carried out in Beijing reduced the photoperiod sensitivity in two subtropical populations successfully. The correlated responses of grain yield to selection were positive and significant when evaluated in long-days, but negative when evaluated under short-day condition. This contrast indicates that most of the yield increases were due to the effects of desensitizing germplasm to photoperiod under long-day conditions.
English
0208|AGRIS 0201|AL-Maize Program|R01PROCE
Juan Carlos Mendieta
CIMMYT Publications Collection