Evaluation of maize plant introductions for cold tolerance

Mock, J.J. and Skrdla,, W.H. (1978) Evaluation of maize plant introductions for cold tolerance. Euphytica, 27 (1). pp. 27-32.

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Cold-tolerance responses of 144 plant introductions (PI) of maize were evaluated attempting to include in the sample at least one PI adapted to each of the countries or ecological zones represented in the maize germplasm collection at the North Central Regional Plant Introduction Station at Ames, Iowa, USA. Plant introductions were grown for 42 days in plastic boxes (26 cm long X 19 cm wide X 10 cm deep) in a growth chamber maintained at 10 plus or minus 1 deg C. Cold-tolerance responses of each PI were evaluated by percentage emergence 30 days after sowing, emergence index (an estimate of rate of emergence) and seedling dry wt. at 42 days after sowing. Estimates of variances and heritabilities for the 3 traits were large suggesting that genotypic variation for cold tolerance in the germplasm collection would be sufficient to permit selection advance. Correlations between the cold-tolerance traits and days from sowing to 50% silk emergence (an estimate of maturity obtained at Ames) were low. Days from sowing to 50% silking emergence for the 25 most cold-tolerant PI's ranged from 46 for PI 214279 from Canada to 106 for PI 331440 from Ethiopia. It should be possible, therefore, to develop cold-tolerant genotypes adapted to all lat

Item Type: Article
Uncontrolled Keywords: Zea mays, maize, cold tolerance, evaluation, world collection.
Author Affiliation: Iowa State University, Ames, IA 50011, USA.
Subjects: Atmosperic Science > Climatology
Statistics and Experimentation > Experimentation
Divisions: Maize
Depositing User: Mr B Krishnamurthy
Date Deposited: 26 Jul 2012 10:14
Last Modified: 26 Jul 2012 10:14
Official URL: http://dx.doi.org/10.1007/BF00039116
URI: http://eprints.icrisat.ac.in/id/eprint/7001

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