Estimates of natural cross pollination in Egyptian clover

Beri, S. M.; Sohoo, M. S.; Sharma, H. L.

doi:10.1007/bf00022874

Cited by 12 publications

(8 citation statements)

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“…‘Wardan’ is a cultivar developed from Egyptian germplasm, which are least self‐fertile as compared to Italian populations. In Indian conditions, the crop is primarily represented by ‘Mescavi’ varieties and is reported to be self‐compatible (Beri, ; Beri, Sohoo, & Sharma, ; Narayanan & Dabadghao, ; Sohoo, Sandhu, & Beri, ). The present findings of T. alexandrinum cv ‘Fahli’ being self‐compatible are in contradiction of earlier report of Hussein, Selim, and Abo‐Slha () but are in accordance with report of Roy, Malaviya, and Kaushal ().…”

Section: Discussionmentioning

confidence: 99%

“…The study indicated that T. alexandrinum cv 'Fahli' was self-compati- 1983;Beri, Sohoo, & Sharma, 1985;Narayanan & Dabadghao, 1972;Sohoo, Sandhu, & Beri, 1994). The present findings of T. alexandrinum cv 'Fahli' being self-compatible are in contradiction of earlier report of Hussein, Selim, and Abo-Slha (1977) but are in accordance with report of Roy, Malaviya, and Kaushal (2005).…”

Section: Self-incompatibilitymentioning

confidence: 99%

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Interspecific compatibility barriers, development of interspecific hybrids through embryo rescue and lineage ofTrifolium alexandrinum(Egyptian clover)—important tropical forage legume

et al. 2018

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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’.

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Section: Discussionmentioning

confidence: 99%

Section: Self-incompatibilitymentioning

confidence: 99%

Interspecific compatibility barriers, development of interspecific hybrids through embryo rescue and lineage ofTrifolium alexandrinum(Egyptian clover)—important tropical forage legume

et al. 2018

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“…In India, reports regarding pollination mechanisms confirm the vital role of bees in seed set (Hassanein 1953, Latif et al 1956, Dixit et al 1989, 1990). In addition, there are many reports that the crop is self-compatible (Bogdan 1966, Chowdhary et al 1966, Narayanan and Dabadghao 1972, Beri 1983, Beri et al 1985, Sohoo et al 1994). According to a recent estimate, the extent of cross-pollination in the crop is 1.44% (Beri et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Pollination behaviour among different breeding populations of Egyptian clover

2005

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Pollination behaviour and the extent of self-compatibility were studied in Trifolium alexandrinum, commonly known as Berseem or Egyptian clover, an important fodder legume cultivated in Egypt, the Mediterranean basin and the Indian subcontinent. Four treatments were imposed on 16 populations comprising three diploid exotic, three diploid advanced breeding, five induced tetraploid and five diploid pentafoliate lines. The different treatments were open pollination, caging, hand tripping and controlled bee visits. Compared with the open pollinated condition, reduction in seed set in different populations ranged from 12.3 to 99.2% under caged condition. Eight of 16 populations registered more than 90% reduction in seed set. Hand tripping and/or controlled bee visits improved seed set considerably in a few populations, whereas, in one population, no significant effect of these four treatments was observed. The results indicated considerable variation for self-compatibility, together with a requirement of tripping for pollination and seed set, even in self-compatible lines.The genus Trifolium comprises approximately 290 species. While T. repens, T. pratense, T. nigrescens, etc. are important constituents of temperate pastures, T. alexandrinum and T. resupinatum are cultivated as winter annual fodder in the tropical and sub-tropical belt. Trifolium alexandrinum, commonly known as Berseem or Egyptian clover is an important winter annual fodder legume cultivated in Egypt, the Mediterranean basin and the Indian subcontinent.For an effective genetic improvement programme, it is imperative to have an adequate knowledge of the breeding system. Identification of self-compatible populations and the development of inbreds is likely to expose the hidden variability among populations of Berseem. The breeding method entails the development of inbreds and the production of hybrid seed. The advantage of this method in an allogamous species is to increase homozygosity, select for traits with additive heritability and identify the plants which are tolerant of selfing (Busbice 1968, Rotili 1993. Controversy exists about the pollination mechanism and compatibility, hence, the present study was undertaken to estimate the extent of selfcompatibility among different populations of Berseem (Egyptian clover) based on seed set per inflorescence under different treatments. Materials and MethodsPlant materials: Sixteen populations of Egyptian clover, Trifolium alexandrinum L., comprising three diploid exotic, three diploid advanced breeding, five induced tetraploid and five diploid pentafoliate (usually T. alexandrinum has trifoliate nature) populations were selected for the present study. These populations represent diverse origins, distinct morphological traits and two different ploidy levels (Table 1). Fifteen populations represented the ÔMescaviÕ and one exotic population represented the ÔSaidiÕ ecotype. The crop was sown in the month of October in 3 m rows spaced at 50 cm and with a plantto-plant distance of 15 cm. The different treatments ...

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“…alternate row, alternate plant and concentric circle under caged (fine muslin cloth) and uncaged conditions. Details of the last method were reported by BERI et al (1985). Measurement of crosspollination in the absence and presence of honey bees was done by scoring the frequency of dominants (purple-flowered plants) in the progeny of recessive plants (white-flowered) harvested separately from each of the three designs under caged and uncaged conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Egyptian clover is a self-fertilizing crop (BOGDAN, 1966;CHOWDHURY et al, 1966;BERI et al, 1985) but a slight percentage of cross-pollination also occurs (BERI et al, 1985). This cross-pllination is due to the pollen being dispersed by honey bees or the wind or by both.…”

Section: Introductionmentioning

confidence: 99%