McVetty, P.B.E. and Evans, L.E. (1980) Breeding methodology in wheat. I. Determination of characters measured on F2 spaced plants for yield selection in spring wheat. Crop Science, 20 (5). pp. 583-586.
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Abstract
Three crosses of spring wheat (Triticum aestivum L.) involving the cultivar ‘Glenlea’ as a common female parent were used to evaluate the use of physiological and/or morphological parameters alone or in combination on F2 plants as selection criteria to identify high-yielding F4 bulks. The F2 generation was grown as spaced plants in the field under two types of environmental regimes: (1) a regime and (2) a normal regime. Stress-free plants were given regular irrigation, optimum fertilization and complete weed control to minimize stress while the normal-regime plants were given no special treatment. Two hundred plants of each cross were measured for physiological, morphological, yield-component, and phenological traits. A random sample of 50 seeds from each of these plants was used to generate F4 bulks. For each cross, groups of 45 F4 bulks derived from stress-free F2's and 75 F4 bulks derived from normal F2's were tested for yield in the F4 in a six-replicate, partially balanced lattice design. The results indicated that single F2 parameters which described source capacity, sink capacity or plant morphology all identified high-yield potential in the F2; however, at 15% selection intensity only 17 out of 53 high-yielding F4 bulks were retained. A multiple regression analysis was found to be better than a single parameter approach, retaining nearly half (24 out of 53) of the high-yielding lines. A combined-cross analysis indicated that yield, productivity, kernel number, peduncle length, and productivity per tiller were all significantly correlated with F4 bulk yields. A multiple regression analysis of the combined crosses indicated that productivity and peduncle length were the only significant common parameters
| Item Type: | Article |
|---|---|
| Additional Information: | SNNigam Collection |
| Uncontrolled Keywords: | Triticum aestivum L., Early generation selection |
| Author Affiliation: | Graduate student, Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, K3T 2N2 |
| Subjects: | Crop Improvement > Genetics/Genomics Crop Improvement > Plant Breeding |
| Divisions: | Other Crops |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 15 Mar 2013 08:11 |
| Last Modified: | 01 Apr 2013 03:54 |
| Official URL: | http://dx.doi.org/10.2135/cropsci1980.0011183X0020... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/9877 |
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