Hormonal Profile in Ovaries of Mandarin Varieties with Differing Reproductive Behaviour

Bermejo, Almudena; Primo‐Millo, Eduardo; Agustí, Manuel; Mesejo, Carlos; Reig, Carmina; Iglesias, Domingo J.

doi:10.1007/s00344-015-9492-y

Cited by 14 publications

(3 citation statements)

References 46 publications

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“…Interestingly, we found that exogenous MT induced parthenocarpy in pear, whereas exogenous IAA could not ( Figure 1 ). Previous studies have shown that ovaries synthesize large amounts of IAA post-pollination to promote fruit development ( Bermejo et al, 2015 ). In our study, IAA content as well as the number of seed cell layers in the ovary did not increase after MT treatment, and IAA content declined after pollination compared with the control.…”

Section: Discussionmentioning

confidence: 99%

Melatonin Induces Parthenocarpy by Regulating Genes in Gibberellin Pathways of ‘Starkrimson’ Pear (Pyrus communis L.)

et al. 2018

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Parthenocarpy, the production of seedless fruit without fertilization, has a variety of valuable qualities, especially for self-incompatible species, such as pear. To explore whether melatonin (MT) induces parthenocarpy, we used ‘Starkrimson’ pear as a material for morphological observations. According to our results, exogenous MT promoted the expansion and division of the mesocarp cells in a manner similar to hand pollination. However, the seeds of exogenous MT-treated fruit were undeveloped and aborted later in the fruit-setting stage. To further investigate how MT induced parthenocarpy, we studied changes of related hormones in the ovaries and found that MT significantly increased the contents of the gibberellins (GAs) GA3 and GA4. Thus, paclobutrazol (PAC), a GA-biosynthesis inhibitor, was used to study the relationship between GAs and MT. In addition, spraying MT after treatment with PAC did not increase GA content nor lead to parthenocarpy. Through a transcriptome analysis, we discovered that MT can cause significant upregulation of PbGA20ox and downregulation of PbGA2ox. However, no significant difference was observed in PbGA2ox compared with the control after PAC and MT applications. Thus, MT induces parthenocarpy by promoting GA biosynthesis along with cell division and mesocarp expansion in pear.

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Section: Discussionmentioning

confidence: 99%

Melatonin Induces Parthenocarpy by Regulating Genes in Gibberellin Pathways of ‘Starkrimson’ Pear (Pyrus communis L.)

et al. 2018

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“…[26]. GA is commercially recommended for the Citrus hybrids exhibiting 'weak parthenocarpy' and 'insufficient cross-pollination,' aiming to enhance the 'fruit set' [27]. Sequential applications of GA3 mitigate flowering and sprouting intensity in 'Montenegrina' mandarin trees during the spring [28].…”

Section: Gibberellic Acid (Ga)mentioning

confidence: 99%

Physiology of Citrus Flowering and Fruiting

Mishra,

Jaiswal,

Mohanty

et al. 2024

Physiology

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The physiology of citrus flowering and fruiting is a crucial and multidirectional component of citrus agriculture. It encircles a web of intricate biological processes and factors determining when and how citrus trees flower and produce fruit. These critical factors are temperature and water stress, which profoundly impact flowering initiation. Hormonal regulation, with gibberellins and auxins as primary actors, is associated with the timing and progression of flowering and fruiting. Understanding floral induction mechanisms is essential for optimizing flowering schedules and fruit production since it is the fastest step in the reproductive process. Successful pollination and fruit set are crucial for productive citrus yield. Moreover, environmental variables like temperature, humidity, and nutrient availability substantially influence citrus physiology. In summation, delving into the physiology of citrus flowering and fruiting is essential for effective orchard management, increased fruit harvests, and the cultivation of premium citrus crops. Understanding these physiological aspects is crucial for optimizing citrus orchard management, enhancing fruit yield, and ensuring higher production with better quality citrus fruits.

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“…Despite several positive traits, some unwanted traits like the excessive seededness (15-30 seeds/fruit) greatly hinders consumer's acceptability, as crushed seeds cause bitterness in the extracted juice. Seedlessness is of paramount importance in citrus breeding and has been attempted by several workers using conventional and non-conventional breeding techniques (Bermejo et al, 2015) [6] . Induced mutagenesis has scientific and commercial interests to improve the plant growth, yield and quality characteristics of commercially important plants.…”

Section: Introductionmentioning

confidence: 99%

Effect of colchicine on plant growth and leaf nutrient acquisition of sweet orange (Citrus sinensis (L.) Osbeck) cv. Mosambi

Singh¹,

Awasthi²,

Singh³

et al. 2020

Int. J. Chem. Stud.

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The present study was conducted on sweet orange cv. Mosambi mutants, developed by treating with different doses of colchicine (0.05%, 0.10%, 0.15% and 0.20%) and raised on Jatti Khatti rootstock. Two years after the field establishment of plants, the developed mutants were examined in terms of alterations in growth parameters and leaf nutrient acquisition. Colchicine had both inhibitory and stimulatory effects on the mutants developed at different doses. Reductions in stem girth and TCSA were recorded at 0.05% and 0.20% of colchicine treatment. Mutants developed at 0.10% and 0.15% colchicine concentration, had stimulatory effect on plant growth parameters. Higher nutrient acquisition was noticed in the leaves of mutants developed at 0.10%-0.15% doses, while lower macronutrient acquisition was recorded at 0.05% and 0.20% doses. Variation induced in the mutants by colchicine indicated that both lower and higher doses of mutagenic treatments may give rise to the mutants of economic importance and indicating its potential use as a mutagen.

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Hormonal Profile in Ovaries of Mandarin Varieties with Differing Reproductive Behaviour

Cited by 14 publications

References 46 publications

Melatonin Induces Parthenocarpy by Regulating Genes in Gibberellin Pathways of ‘Starkrimson’ Pear (Pyrus communis L.)

Melatonin Induces Parthenocarpy by Regulating Genes in Gibberellin Pathways of ‘Starkrimson’ Pear (Pyrus communis L.)

Physiology of Citrus Flowering and Fruiting

Effect of colchicine on plant growth and leaf nutrient acquisition of sweet orange (Citrus sinensis (L.) Osbeck) cv. Mosambi

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