Sunkifolias and Buxisunkis: Sexually obtained reciprocal hybrids of Citrus sunki x Severinia buxifolia

Medina-Filho, H. P.; Bordignon, Rita; Ballve, Rosa Maria Lizana

doi:10.1590/s1415-47571998000100021

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…Citrus species exhibit broad sexual compatibility. Interspecific and intergeneric hybridizations are feasible even between primitive and cultivated citrus 17 . Our experiments also support the grafting compatibility and partial sexual compatibility of Atalantia and Citrus (Supplementary Fig.…”

Section: Citrinae Phylogeny and Reproductive Systemsmentioning

confidence: 99%

Genomic analyses of primitive, wild and cultivated citrus provide insights into asexual reproduction

et al. 2017

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The emergence of apomixis-the transition from sexual to asexual reproduction-is a prominent feature of modern citrus. Here we de novo sequenced and comprehensively studied the genomes of four representative citrus species. Additionally, we sequenced 100 accessions of primitive, wild and cultivated citrus. Comparative population analysis suggested that genomic regions harboring energy- and reproduction-associated genes are probably under selection in cultivated citrus. We also narrowed the genetic locus responsible for citrus polyembryony, a form of apomixis, to an 80-kb region containing 11 candidate genes. One of these, CitRWP, is expressed at higher levels in ovules of polyembryonic cultivars. We found a miniature inverted-repeat transposable element insertion in the promoter region of CitRWP that cosegregated with polyembryony. This study provides new insights into citrus apomixis and constitutes a promising resource for the mining of agriculturally important genes.

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Section: Citrinae Phylogeny and Reproductive Systemsmentioning

confidence: 99%

Genomic analyses of primitive, wild and cultivated citrus provide insights into asexual reproduction

et al. 2017

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“…There has been very little successful intergeneric sexual hybridization between the Aurantioideae and Toddaliodaea. However, use of biotechnology has generated intergeneric somatic hybrids of some sexual-incompatible taxa such as C. senensis 'Hamlin' combined with Severinia disticha and Citropsis gillentiana, Citrus + Citropsis, and Citrus + Severinia (Grosser et al, , 1998Medina-Filho et al, 1998). These approaches may permit integration of genes for cold-hardiness.…”

Section: Discussionmentioning

confidence: 99%

Freeze Response of Citrus and Citrus-related Genotypes in a Florida Field Planting

Inch¹,

Stover²,

Driggers³

et al. 2014

horts

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A test population consisting of progenies of 92 seed-source genotypes (hereafter called “parent genotypes”) of Citrus and Citrus relatives in the field in east–central Florida was assessed after natural freeze events in the winters of 2010 and 2011. Eight seedlings per parent genotype were planted in a randomized complete block design; however, as a result of mortality, the number of plants assessed in some genotype groups was reduced at some or all sampling dates. The citrus diseases huanglongbing and citrus canker were endemic in the planting and may have influenced tree response to cold temperatures. Unusually low temperatures (near –4 °C each winter) for east–central Florida were experienced during the trial period. Defoliation and dieback were significantly greater in the winter of 2011 than in the winter of 2010. The winter in 2011 was preceded by a period of extraordinarily low temperatures in mid-December with no period of cool temperatures to allow trees to acclimate. In 2010 the average defoliation was 53% ± 28% and less than 13% of the trees exhibited any noticeable dieback, whereas in 2011, the average defoliation and dieback were 93% ± 17% and 51% ± 35%, respectively. Within the genus Citrus, several progenies were identified that had 16% to 24% dieback in 2011 and these were from parent genotypes C. reticulata (CRC 2590) (23%), C. sinensis (CRC 3858) (24%), C. maxima (CRC 3945) (16%), C. hassaku (CRC 3907 and 3942) (16% and 17%), C. aurantium (CRC 628 and 2717) (18% and 7%), C. taiwanica (CRC 2588) (21%), and C. neo-aurantium (C. obovoidea + C. unshiu graft chimera) (CRC 3816) (23%). Within other genera in the Aurantiodeae, Poncirus trifoliata (CRCs 301, 3957, 3549, and 4007), Severinia buxifolia (CRC 1497), Bergera koenigii (CRC 3165), and Glycosmis pentaphylla (CRC 3285) had the least amount of dieback, all at less than 23%. The two species within the Toddalioideae subfamily of the Rutaceae (Casimiroa edulis and Zanthoxylum ailanthoides) had among the least amount of dieback (1% and 8%, respectively). When considered by groups, the Citrons and Australian natives had the greatest amount of dieback in 2011, 68% and 65%, respectively. The trifoliates (Poncirus and hybrids) had the least dieback, ranging from 4% to 40%. The information from this study may be useful in germplasm enhancement and Citrus breeding targeting greater cold tolerance.

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“…In contrast, antibiosis from S. buxifolia, E. glauca, M. australis, and C. hystrix could potentially be introgressed via breeding into citrus rootstocks because these four species are sexually compatible (Swingle, 1967;Medina-Filho et al, 1998) with some common species of the genus Citrus. Although resistance to D. abbreviatus was not a factor in their creation, hundreds of sexual hybrids between Citrus species and Eremocitrus or Microcitrus already exist in the germplasm of the Ft. Pierce USDA breeding programs.…”

Section: Discussionmentioning

confidence: 99%

Sources of Resistance to Diaprepes Weevil in Subfamily Aurantiodeae, Rutaceae

Bowman¹,

Shapiro²,

Lapointe³

2001

HortSci

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Commercially used citrus rootstocks can all be seriously damaged by larvae of the sugar cane root weevil, Diaprepes abbreviatus (L.). Six greenhouse challenge experiments were used to compare the resistance of 24 selections of citrus rootstocks and related species to this weevil by measuring root damage, and larval growth and survival. The commercial rootstocks tested were found to be susceptible, while at least seven other species within the subfamily Aurantiodeae were observed to be significantly more resistant. The species Balsamocitrus dawei Stapf. was most resistant to weevil larvae, exhibited less root damage than commonly used rootstock cultivars, and significantly depressed larval growth and survival. The species Glycosmis pentaphylla (Retz.) Correa, Microcitrus australis (Planch.) Swing., Eremocitrus glauca (Lindl.) Swing., Severinia buxifolia (Poir.) Tenore, Triphasia trifolia (Burm. f.) P. Wils., and Citrus hystrix DC. suffered as much damage from the weevil as common rootstock cultivars but significantly depressed growth of larvae feeding on them. One new hybrid rootstock, HRS-801, also significantly depressed D. abbreviatus larval growth, but this effect has not yet been verified as having significance in a long-term or field situation. Several strategies are discussed for developing citrus rootstocks resistant to D. abbreviatus.

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Sunkifolias and Buxisunkis: Sexually obtained reciprocal hybrids of Citrus sunki x Severinia buxifolia

Cited by 6 publications

References 12 publications

Genomic analyses of primitive, wild and cultivated citrus provide insights into asexual reproduction

Genomic analyses of primitive, wild and cultivated citrus provide insights into asexual reproduction

Freeze Response of Citrus and Citrus-related Genotypes in a Florida Field Planting

Sources of Resistance to Diaprepes Weevil in Subfamily Aurantiodeae, Rutaceae

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