Pollen Tube Growth and Development of Ovules in Relation to Fruit Set in Mandarines, Cv. 'Clementine' (Citrus Reticulata Blanco)

Eti, Sinan; Stösser, R.

doi:10.17660/actahortic.1992.321.74

Cited by 12 publications

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“…are important for abscission of floral parts. Eti and Stosser (1992) reported the abscission time of style in mandarin was after 12 days of anthesis.…”

Section: Resultsmentioning

confidence: 99%

Floral biology of indigenous pummelo genotypes

Hoque

2015

Bangladesh J. Agric. Res

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Flower morphology and bud development of pummelo accessions CG-1, CG-18 and CG-151 were studied at the Pummelo Orchard of Regional Agricultural Research Station, BARI, Akbarpur, Moulvibazar and the Horticulture Laboratory of Bangabandhu Sheikh Mujibur Rahman Agricultural University during [2008][2009]. Pummelo flowers were bisexual, bore singly on leaf axils or in clusters with or without leaf on stem in all accessions, and colour were white. Calyx diameter varied from 0.94 in CG-1 to 1.02 in CG-18. Number of petals per flower ranged from 4.0 to 4.5. Anthers were yellow in colour and only CG-151 produced few rudimentary styles. Diameter of stigma varied from 0.39 mm to 0.49 mm. Number of locules per ovary was in between 14.6 to16.0 and number of ovules per locules varied from 4.0 to 9.0. Stages of floral bud development from initiation to anthesis were divided into 9 distinct stages. In pummelo, a total of 27.7 to 31.2 days were required from a bud initiation to reach its fully developed stage. Suitable time for emasculation of pummelo flowers was found within 26 days from flower bud initiation. Between 3:00am to 5:00am, about 76% flowers were found to be opened and between 4:00pm to 5:00pm in all the three accessions, dehiscence of pollens was recorded. Abscission of stamen, petal and style started after 50.8, 76.4 and 162.3 hrs and completed after 128.4, 137.9 and 228.3 hrs of anthesis, respectively.

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“…are important for abscission of floral parts. Eti and Stosser (1992) reported the abscission time of style in mandarin was after 12 days of anthesis.…”

Section: Resultsmentioning

confidence: 99%

Floral biology of indigenous pummelo genotypes

Hoque

2015

Bangladesh J. Agric. Res

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“…Self-incompatibility is also a critical economic problem in several commercial mandarin without high parthenocarpic abilities (Eti and Stosser, 1992). However, information is lacking on the pollen-pistil incompatibility in the species that constitutes the new mandarin hybrids, except for 'Comune Clementine', which is known to be self-incompatible because pollen tubes arrest in the style (Ton and Krezdorn, 1966).…”

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Pollen Tube Behavior in Different Mandarin Hybrids

Distefano¹,

Casas²,

Malfa³

et al. 2009

J. Amer. Soc. Hort. Sci.

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Seedlessness is an important trait in the evaluation of commercial mandarin for fresh consumption. However, in the last decade, the presence of seeds in fruit of cultivars considered as seedless has become a problem in different citrus-growing areas because the commercial value is depreciated. Seeds have appeared concomitantly with the introduction of new cultivars that appear to be cross-compatible. To overcome this problem, different strategies have been explored, but a definitive answer is still elusive. The search for alternatives contrasts with how little is known about the basis of the problem: the pollen-pistil incompatibility reaction in mandarin, and the intercompatibility relationship between different cultivars. In this work, we characterized the pollen-pistil incompatibility in the two commonly grown mandarin cultivars Fortune and Nova, and evaluated the intercompatibility relationship between six cultivars with different genetic origins; these cultivars included Fortune (Citrus clementina Hort. ex Tan. × Citrus reticulata Blanco), Nova [(Citrus paradisi Macf. × C. reticulata) × C. clementina), Comune Clementine (C. clementina), Avana apireno (C. reticulata), Primosole (Citrus unshiu Marcov. × C. reticulata), and Simeto (C. unshiu × Citrus deliciosa Ten.). Following the controlled hand pollination in the field, we evaluated pollen tube performance after self- and cross-pollination, as well as intercultivar compatibility by observing pollen tube growth. The results show the self-incompatibility of these cultivars with the pollen tube having been arrested in the style, which explains their seedless condition when planted in solid blocks. The study of intercompatibility indicates a different pollen tube behavior depending on the genotype, as well as on the cross combinations. These results provide a basis to evaluate self- and intercompatibility in citrus, and the effect of close planting of some cultivars.

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“…Higher performance of cross-vs. self-pollen is common in many species (Aizen et al, 1990;Cruzan, 1989;Snow and Spira, 1991). Regrettably, most research in Citrus has been concentrated in breeding programs aimed at the search of adequate pollen donors in self-incompatible cultivars (Eti and Stosser, 1992;Ngo et al, 2001), or of plants resistant to diff erent nutritional stresses, particularly to N and Mg defi ciencies, or insect herbivory (e.g., Argov et al, 1999;Krezdorn, 1986b;Peralta, 1999). Although Citrus blooms profusely, mature fruits are produced from a very small percentage of fl owers (0.1-3.5% in Bustan and Goldschmidt, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…More generally, fruit production, even in fully self-compatible plant species, may be strongly pollinator-limited (Klein et al, 2003a;Richards, 2001;Roubik, 2002a). Regrettably, most research in Citrus has been concentrated in breeding programs aimed at the search of adequate pollen donors in self-incompatible cultivars (Eti and Stosser, 1992;Ngo et al, 2001), or of plants resistant to diff erent nutritional stresses, particularly to N and Mg defi ciencies, or insect herbivory (e.g., Argov et al, 1999;Krezdorn, 1986b;Peralta, 1999). Thus, the degree of yield improvement that could be reached by encouraging effi cient pollination and improving the pollination environment remains uncertain.…”

Section: Discussionmentioning

confidence: 99%

“…Each branch enclosed 8.7 ± 6.6 fl owers (mean ± 1 SE). Following standard breeding system protocols (described in detail in Kearns and Inouye, 1993), each branch was assigned randomly to one of fi ve diff erent manipulative pollination treatments, with two branches per treatment: (Treatment 1) to test for apomixis, we emasculated bagged fl ower buds by removing anthers with a pair of fi ne forceps and applied no pollen to the stigmas; (Treatment 2) to test for spontaneous self-pollination, we bagged fl owers that were not manipulated in any other way; (Treatment 3) to test for potential geitonogamous pollination and self-compatibility, we hand-pollinated fl owers in bagged branches by brushing dehisced anthers from fi ve other fl owers (Eti and Stosser, 1992;Ngo et al, 2001). In total, 223 styles were collected, which represented a mean of 28 styles treatment −1 (pollen origin and time combination).…”

Section: Pollination Experimentsmentioning

confidence: 99%

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Pollination Requirements of Pigmented Grapefruit (Citrus paradisiMacf.) from Northwestern Argentina

Chacoff¹,

Aizen

2007

Crop Sci.

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The consequence of a proposed pollinator decline for agriculture is a subject of much ongoing debate. However, pollination requirements of many cultivated plants remain unknown. Citrus is complex in terms of pollination needs because of great variation in breeding systems among and within species, and even among and within cultivars. The objective of this study was to evaluate pollinator dependence of three cultivars of grapefruit (Citrus paradisi Macf.) planted in northwestern Argentina. Bagged flowering branches were assigned to different pollination treatments: emasculation, spontaneous self‐pollination, hand self‐pollination, and hand cross‐pollination, and the results compared with those from open‐pollinated flowers. We counted the number of pollen grains and pollen tubes in the style, fruit set, and seed production. We also assessed differences in germination rates of self‐ vs. cross‐pollen grains. We found that handߚ and open‐pollinated flowers set about six times more fruit than emasculated and bagged (insect excluded) flowers. In addition, cross‐pollen performed better in terms of grain germination and tube growth than self‐pollen. Although being fully self‐compatible, apomixis and wind pollination are not important factors for grapefruit reproductive success. Thus, insect pollinators represent a critical and potential limiting resource for seedless grapefruits from northwestern Argentina.

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Pollen Tube Growth and Development of Ovules in Relation to Fruit Set in Mandarines, Cv. 'Clementine' (Citrus Reticulata Blanco)

Cited by 12 publications

References 0 publications

Floral biology of indigenous pummelo genotypes

Floral biology of indigenous pummelo genotypes

Pollen Tube Behavior in Different Mandarin Hybrids

Pollination Requirements of Pigmented Grapefruit (Citrus paradisiMacf.) from Northwestern Argentina

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