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The role of exotic germplasm for hybrid maize breeding research

By: Shi-huang Zhang | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico, DF (Mexico) | 7, Proceedings of the Asian Regional Maize Workshop Los Baños (Philippines) 23-27 Feb 1998.
Contributor(s): De-quan Shi [coaut.] | Vasal, S.K.|Gonzalez Ceniceros, F.|XiongMing, F [eds.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Los Baños, Laguna (Philippines) PCARRD : 2000Description: p. 105-114.Subject(s): Beijing | Germplasm | Grain AGROVOC | Heterosis AGROVOC | Maize | Subtropical zone | Yields AGROVOC | Genotypes AGROVOC | Hybrids AGROVOC | Plant breeding AGROVOCSummary: 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.Collection: CIMMYT Publications Collection
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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

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