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Evaluation of Combining Abilities of Winter-Rye Inbred Lines with the Topcross Method
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Evaluation of Combining Abilities of Winter-Rye Inbred Lines with the Topcross Method
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Journal Article
Evaluation of Combining Abilities of Winter-Rye Inbred Lines with the Topcross Method
2023
Overview
Identification of the inbred lines perspective for combining abilities of winter rye is an important stage in the hybrid breeding cycle. The objective of the surveys is to evaluate the general and specific combining abilities of the inbred lines of winter rye with a topcross method. Thirty rye homozygous lines carrying the sterility-inducing cytoplasm of the Pampa type served as the maternal inheritance patterns. Four male fertile homozygous lines mfН-1432, mfН-1423, mfН-1147, and mfН-1842 were used as testers. Test crossings were performed on the spatially isolated fields in 2019. Overall, 120 simple interlinear F1 hybrids were produced. Their testing was carried out on the plots of 8.0-m
2
area with two field replicates. The Valdai cultivar was used as a standard at the population level. The F1 hybrid crop yields varied from 5.08 to 7.55 t/ha at the parameter average value of 6.27 t/ha within the experiment. The hybrids containing lines msН-1185-1 were considered highest-yielding crops. Their crop yields varied from 6.92 to 7.48 t/ha relative to the tester. Frequency of occurrence of hybrids F1 with reliably high competitive heterosis comprised 20 of 120, or 16.7%. Both the general (GCA) and specific (SCA) combining abilities made the essential contribution to dispersion of the crop-related traits. In addition, the portions of the GCA and SCA effects comprised 91.2 and 6.9% of dispersion of the crop-related traits, respectively. A high variance GCA/SCA ratio indicates rather substantial genetic divergence between the inbred lines used in breeding. Rather high GCA is recorded for seven sterile lines, such as msH-1185-1, msH-1185-2, msН-1179, msН-1238, msН-700, msН-48, and msН-1247. The line mfН-1147 was considered best on GCA among the tester lines. Lines msН-451, msН-577, msН-842, msH-1185-2, and msН-1190 and testers mfН-1432 and mfН-1423 showed great SCA effects. The average crop yield of the hybrids containing lines of high GCA was reliably higher than that in the hybrids containing lines of high SCA (6.76 vs. 6.24 t/ha, true T-value
T
fact
= 3.38 >
T
05
= 2.22). However, nine sterile lines possessed significantly lower GCA. A positive correlation between the line GCA effects and the levels of their crop yields was revealed (
r
= 0.59, true T-value
T
fact
= 2.30 >
T
05
= 2.22).
Publisher
Pleiades Publishing,Springer Nature B.V
Subject
