GENE EFFECTS IN CORN (ZEA MAYS L.): III. RELATIVE STABILITY OF THE GENE EFFECTS IN DIFFERENT ENVIRONMENTS

1962 ◽  
Vol 42 (4) ◽  
pp. 628-634 ◽  
Author(s):  
Edwin E. Gamble
Keyword(s):  
Zea Mays ◽  
Relative Stability ◽  
Seed Weight ◽  
Zea Mays L ◽  
Inbred Lines ◽  
Minor Importance ◽  
Gene Effects ◽  
Population Means ◽  
Additive Gene ◽  
The Cross

Six inbred lines of corn and their F1’s, F2’s, and backcrosses were tested at two locations in each of 2 years. The population means obtained were used to estimate additive, dominance, additive × additive, additive × dominance, and dominance × dominance gene effects for six quantitative attributes.Variance components of cross × environment interactions indicated the presence of major interactions of gene effects with environments. The cross × year interactions were of major importance but the cross × location interactions were of minor importance. Additive gene effects appeared to be the most constant over environments followed by additive × dominance gene effects. The remaining types of gene effects indicated very little stability over environments for most of the attributes studied. Estimates of gene effects were most constant over environments for ear diameter in corn while yield, plant height, and seed weight showed little or no stability of the estimates of the gene effects.

GENE EFFECTS IN CORN (ZEA MAYS L.): I. SEPARATION AND RELATIVE IMPORTANCE OF GENE EFFECTS FOR YIELD

1962 ◽  
Vol 42 (2) ◽  
pp. 339-348 ◽  
Author(s):  
E. E. Gamble
Keyword(s):  
Zea Mays ◽  
Genetic Variation ◽  
Zea Mays L ◽  
Inbred Lines ◽  
Relative Importance ◽  
Gene Effects ◽  
Yield Performance ◽  
Population Means ◽  
Additive Gene Effects ◽  
Additive Gene

A procedure is outlined for the separation, into six parameters, of gene effects affecting genetic variation of a quantitative trait. These parameters represent mean effects, additive and dominance gene effects, and the three types of digenic epistatic effects. Estimates of the parameters are obtained using the population means of two inbred lines, their cross, and descendants due to subsequent selfing and crossing. The relative importance of the different gene effects can be evaluated from the magnitude and significance of the estimates.Population means of six inbred lines of corn, and all possible F1, F2, P1F1, and P2F1 crosses among them, were used to obtain estimates of the various gene effects for yield of shelled corn. Mean yield performance of the populations was obtained from four experiments grown at two locations in each of 2 years.With regard to the 15 crosses, the estimates of gene effects indicate that the dominance gene effects were quite important in the inheritance of yield. Estimates of additive gene effects were of low magnitude and many were non-significant. Epistatic gene effects were considered to be more important than additive gene effects in the inheritance of yield in the crosses studied. The additive × additive and additive × dominance gene effects were relatively more important than the dominance × dominance effects.

GENE EFFECTS IN CORN (ZEA MAYS L.): II. RELATIVE IMPORTANCE OF GENE EFFECTS FOR PLANT HEIGHT AND CERTAIN COMPONENT ATTRIBUTES OF YIELD

1962 ◽  
Vol 42 (2) ◽  
pp. 349-358 ◽  
Author(s):  
E. E. Gamble
Keyword(s):  
Plant Height ◽  
Seed Weight ◽  
Zea Mays L ◽  
Inbred Lines ◽  
Relative Importance ◽  
Additive Effects ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Additive Gene ◽  
Kernel Row Number

Estimates of mean effects, additive, dominance, additive × additive, additive × dominance, and dominance × dominance gene effects were obtained for 15 crosses from 6 inbred lines of corn for each of the following attributes: plant height, kernel row number, ear length, ear diameter, and seed weight.All the gene effects were found to contribute to inheritance of the attributes in the crosses studied. However, not all gene effects are present in all crosses. Mean effects were the most important contributors to the inheritance of the attributes. Of the gene effects, the dominance gene effects were the most important contributors to the inheritance of the attributes except for kernel row number. Additive, dominance and epistatic gene effects appear to contribute more or less equally to the inheritance of kernel row number. Additive gene effects were more important for these attributes than for yield. They were relatively more important for kernel row number, ear diameter, and seed weight than for plant height and ear length.Epistatic gene effects were relatively more important than additive gene effects but less important than dominance gene effects for the material studied. For the attributes studied the additive × dominance and dominance × dominance gene effects were somewhat more important contributors to inheritance than the additive × additive effects.

DIALLEL ANALYSIS OF LEAF NUMBER AND DURATION TO MID-SILK IN MAIZE

1977 ◽  
Vol 19 (2) ◽  
pp. 251-258 ◽  
Author(s):  
E. E. N. A. Bonaparte
Keyword(s):  
Zea Mays L ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Inbred Lines ◽  
Leaf Number ◽  
Gene Effects ◽  
Partial Dominance ◽  
Effective Factor ◽  
Additive Gene ◽  
Mode Of Inheritance

The diallel cross technique was used to study the mode of inheritance of leaf number and duration to mid-silk in six inbred lines of maize (Zea mays L.). Leaf number showed partial dominance, and the additive gene effects accounted for a high proportion of the total variation. The narrow and broad heritabilities were both high. Leaf number was controlled by at least one effective factor. Both additive and dominance components were responsible for the expression of duration to mid-silk. The narrow and broad heritabilities were both high. Duration to mid-silk was controlled by at least four effective factors.

scholarly journals Comparative evaluation of maize (Zea mays L.) genotypes based on distinctness, uniformity and stability (DUS) testing using physiological and morphological characters

2016 ◽  
Vol 8 (2) ◽  
pp. 652-657
Author(s):  
Divya Prakash Singh ◽  
Shailesh Marker
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Plant Breeding ◽  
Comparative Evaluation ◽  
Seed Weight ◽  
Zea Mays L ◽  
Morphological Characters ◽  
Inbred Lines ◽  
Dus Testing ◽  
100 Seed Weight

A major challenge facing those involved in the testing of new plant varieties for Distinctness, Uniformity and Stability (DUS) is the need to compare them against all those of ‘common knowledge’. A set of maize inbred lines was used to compare how morphological and physio- logical characterization described variety relationships. An experiment was carried out to evaluate test of Distinctiveness, Uniformity and Stability using 26 physiological and 12 morphological characters. Minimum days for 50 % tasseling (50.66 and 50.66 days), minimum days for 50 % silking (53.66 and 53.66 days), minimum days for anthesis silking interval (3.0 and 2.6 days), maximum tassel branching (22.66 and 21.66), maximum cob height (89.70 and 89.16 cm) and maximum cob length (16.96 and 17.75 cm) were recorded in genotype AAIMS-1 in both experiments (2011 and 2012 respectively) and maximum cob width (12.51 and 13.11 cm) and maximum number of grain rows per cob (12.66 and 12.66) were recorded in genotype AAIMS-2 in both experiments (2011 and 2012 respectively). But maximum plant height (155.13 and 153.71cm), minimum days for maturity (86.00 and 88.00 days), maximum grain yield per plant (72.80 and 72.00 g) and maximum 100 seed weight (21.51 and 20.96 g) were recorded in genotype AAIMS-2 and AAIMS-1 respectively in both experiments conducted at experimental farm of Department of Genetics and Plant Breeding, Sam Higginbottom Institute of Agriculture, Technology & Sciences during the year 2011 and 2012 respectively.

scholarly journals Identification of Heterotic Pairs by Full-Sib Reciprocal Recurrent Selection in Maize Synthetic Populations on Turda CompositeA(B)(2) x Turda CompositeB(A)(2)

2013 ◽  
Vol 70 (1) ◽  
pp. 208-213
Author(s):  
Andreea Daniela ONA ◽  
Ioan HAȘ ◽  
Ivan ILARIE ◽  
Voichița HAȘ ◽  
Nicolae TRITEAN ◽  
...  
Keyword(s):  
Recurrent Selection ◽  
Inbred Lines ◽  
Heterotic Group ◽  
Yield Potential ◽  
Reciprocal Recurrent Selection ◽  
Maize Breeding ◽  
Gene Effects ◽  
Synthetic Populations ◽  
Additive Gene ◽  
Selection Test

In the last 40 years, pre-breeding works induced, in more and more centers of maize breeding, full-sib reciprocal recurrent selection programmes to identify some heterotic pairs which can be sources for obtaining performance inbred lines. The aim is to identify the heterotic pairs with the best results according to the yield potential of maize, the breaking and falling resistance, and the grains moisture at the harvesting time. The creation programme of A and B composite population started at ARDS Turda in 1985. Inside of A composite came the next inbred lines: B73, A632, M117, TC209, T291, being from the B SSS heterotic group, and inside of B composite came the inbred lines Mo17, C103, TC 208, T248, W633, appreciated by us or being related to Lancaster Sure Crop heterotic group. The experimentation was done in two orientation comparative cultures, each one with 49 variants, in 4 repetitions; the comparative culture was a balanced quadratic grid of 7x7 type. From each culture were chosen the first six variants, which were evaluated according to the next characters: production potential, breaking and falling resistance, grains moisture at harvest. The presented results are a part from the second cycle of full-sib reciprocal recurrent selection. Test crosses and self-pollinations were made on plants from the two composites which had two cobs; on the first cob from A Composite realised the cross with the corresponding plant from the B Composite, and from the plant panicle of the B Composite was collected pollen to pollinate the chosen plant from the A Composite. At the both plants from the crossing, the second cob was self-pollinated and kept in reserve until 2010, when the test crosses was experimented and were selected the pairs with the best results according to the above characters. Using the full-sib reciprocal recurrent selection, we can successfully harnessing, simultaneously, the additive and non-additive gene effects.

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