Interspecific compatibility barriers, development of interspecific hybrids through embryo rescue and lineage of Trifolium alexandrinum (Egyptian clover)—important tropical forage legume. (11th July 2018)

• Record Type: Journal Article
• Authors: Malaviya, Devendra R.; Roy, Ajoy K.; Kaushal, Pankaj; Chakraborti, Mridul; Yadav, Aradhana; Khare, Ambica; Dhir, Richa; Khairnar, Dushyant; George, Ginu Percis
• Editors: Rognli, Odd Arne
• Is Part Of: Plant breeding. Volume 137:Number 4(2018)
• Page Start: 655
• Page End: 672
• Publication Date: 2018-07-11
• Subjects: Egyptian clover -- embryo rescue -- interspecific compatibility -- pollen tube growth -- Trifolium; Plant breeding -- Periodicals; 631.52
• DOI: 10.1111/pbr.12616
• Languages: English
• ISSNs: 0179-9541

Abstract

Abstract: Genetic improvement of Trifolium alexandrinum L. is hampered because of narrow genetic base and lack of interspecies compatibility information. The study was envisaged to understand the interspecies incompatibility and the affinity between T. alexandrinum and 22 species of the genus representing different sections and to develop interspecific crosses. Development of interspecific hybrids with T. resupinatum, T. lappaceum, T. subterraneum, T. vesiculosum and T. echinatum, through embryo rescue, revealed their affinity with T. alexandrinum . Failure of pollen germination or restricted pollen tube growth showed its distant relatedness with T. clypeatum, T. balansae, T. purpureum, T. leucanthum, T. hirtum, T. pilulare and T. hybridum . Pollen tubes reached up to ovule among the crosses with T. alpestre, T. repens and T. nigrescens, whereas it travelled up to ovary among the crosses with T. angustifolium, T. grandiflorum and T. dasyurum indicating need of manipulation to overcome barrier. Thus, incompatibility of T. alexandrinum with many Trifolium species could be overcome through embryo rescue with intensive crossing. Egyptian clover ecotype 'Fahli' was more compatible with other species than 'Mescavi'.