General and specific combining ability in lucerne at different levels of in breeding and performance of second-generation synthetics measured in competitive conditions

Rotili, P.; Zannone, L.

doi:10.1007/bf00022478

Cited by 13 publications

(4 citation statements)

References 2 publications

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“…For what total green matter yield per m 2 is concerned, seed producer plants yielded 65 %, 76 % and 73 % of the total in mixtures A, B and C respectively. These results confirm that, under dense stand conditions, plants superior in height, which is one of the most powerful characters governing competitive ability (ROTILI & ZANNONE, 1974ZANNONE, , 1975 YAMADA & HO RI UCHI, 1960) are the most productive both in forage and in seed.…”

Section: Methodssupporting

confidence: 64%

Effects of competition between alfalfa (Medicago sativa L.) hybrid and inbred plants on their seed and forage yield (1)

Veronesi¹,

Damiani²,

Grando³

et al. 1985

Agronomie

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Section: Methodssupporting

confidence: 64%

Effects of competition between alfalfa (Medicago sativa L.) hybrid and inbred plants on their seed and forage yield (1)

Veronesi¹,

Damiani²,

Grando³

et al. 1985

Agronomie

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“…Nevertheless, Rotili and Zannone [5] testified the advisability of bringing the inbred line up to the second and third generations (J 2 and J 3 ). This research is devoted to the selection processes of alfalfa to isolate the valuable samples and on their basis create inbred lines for inclusion in newly synthesized populations (varieties).…”

Section: Results Of Selection Studies Of Alfalfa Based On Inbred Linementioning

confidence: 99%

Results of Selection Studies of Alfalfa Based on Inbred Lines

Galiolla¹,

Serik²,

Sakysh³

et al. 2017

JAST-A

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Abstract:The collection of alfalfa in the context of ecology-geographical groups was studied, consisting of 1,078 samples, including 985 samples of the cultivated species-M. sativa L. and M. varia Mart., and 93 samples for other wild species. Highly productive samples are allocated in the three-year cycle of using the grass stand in the haymaking regime. Individual genotypes of isolated samples are used for selection of inbred lines required for the formation of synthetic varieties. Inbred lines were created by forced self-pollination on genotypes with signs of self-fertility. Methodical experiments established the efficiency of bringing inbred lines to generations J 2 and J 3 . In this case, the overall combinational ability reaches a potential value, and further incubation outside of J 2 and J 3 does not significantly affect its value. With the selection of the best inbred lines in J 2 and J 3 , the lucerne varieties: Kokorai, Osimtal and Kokbalausa, which are protected by patents and author's certificates, have been created in accordance with the general combination ability and their inclusion in the structure of synthetic varieties.

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“…A formal comparison of HS progeny‐based vs. S 2 progeny‐based selection was hardly provided by earlier studies. For example, the reports by Rotili and Zannone (1974) and Rotili (1976) compared the phenotypic selection of S 0 , S 1 , S 2 , S 3 and/or S 4 individual plants of alfalfa grown in density conditions by assuming additional, highly‐intense selection for plant vigor performed after each selfing stage (e.g., selecting among S 1 plants generated from selfed selected S 0 plants), thereby highlighting the ability to realize further selection gain over that of the preceding generation until the S 2 generation. In addition, their studies were based on narrowly‐based synthetic varieties of two, four or eight selected parents, a scenario that can emphasize the impact of inbreeding depression and the value of selecting against it within selfed progenies.…”

Section: Discussionmentioning

confidence: 99%

“…Half-sib progeny-based and S 1 progenybased selections were equally ineffective for alfalfa in Busbice et al (1974). Rotili and Zannone (1974) and Rotili (1976) found that alfalfa yield gains tended to be maximized by selection on S 2 material that derived from earlier selection performed at each selfing stage. One cycle of S 1 progeny-based selection was as effective as two cycles of mass selection and more effective than one cycle of S 2 progeny-based selection in a more recent alfalfa study (Hansen et al, 2010).…”

mentioning

confidence: 99%

Comparison among nine alfalfa breeding schemes based on actual biomass yield gains

Annicchiarico¹,

Pecetti²

2021

Crop Science

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The definition of efficient selection methods for biomass yield of alfalfa and other open-pollinated forage crops has lagged behind, despite its crucial importance for breeders. This study, performed in northern Italy, aimed to compare nine breeding schemes encompassing the evaluation of replicated clones and half-sib (HS), first selfing generation (S 1 ) or second selfing generation (S 2 ) families without or with within-family selection. The comparison was based on actual gains for dry-matter yield over 43 mo and final plant survival across irrigated and rainfed cropping of advanced generation synthetics (Syn-3) built from 12 selected parents. The study envisaged biomass yield selection over 31 mo under dense planting among 125 S 0 plants and/or their progenies, after a stage of stratified mass selection which acted as a benchmark for genetic gains and whose genetic progress over the original genetic base was concurrently assessed. Half-sib progeny-based selection exhibited highest genetic gains with respect to unit time and return on yearly investment for direct costs for both biomass yield and crop persistence. Among-and-within-HS family selection ranked second, and S 1 progeny-based selection ranked third, for yield gains, whereas three schemes implying two selfing generations were valuable for improving persistence but not yield. The initial stage of stratified mass selection was time-and costefficient for improving yield but not persistence. We provided information also on self-fertility and inbreeding depression variation across selfing generations, genetic variation of clonal, HS, S 1 and S 2 material, and consistency of S 0 parent value across different types of material. Our results may have implications for field-based and genomic selection. INTRODUCTIONAlfalfa (alias lucerne; Medicago sativa L. subsp. sativa, 2n = 4x = 32) is the most widely grown perennial forage legume in temperate countries (Annicchiarico, Barrett

show abstract

General and specific combining ability in lucerne at different levels of in breeding and performance of second-generation synthetics measured in competitive conditions

Cited by 13 publications

References 2 publications

Effects of competition between alfalfa (Medicago sativa L.) hybrid and inbred plants on their seed and forage yield (1)

Effects of competition between alfalfa (Medicago sativa L.) hybrid and inbred plants on their seed and forage yield (1)

Results of Selection Studies of Alfalfa Based on Inbred Lines

Comparison among nine alfalfa breeding schemes based on actual biomass yield gains

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