FLOWERING LOCUS T genes control onion bulb formation and flowering

Lee, Robyn; Baldwin, Samantha; Kenel, Fernand; McCallum, John; Macknight, Richard C.

doi:10.1038/ncomms3884

Cited by 208 publications

(279 citation statements)

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“…Both flowering and bulbing processes are important traits in A. cepa influenced by vernalization and photoperiodic responses, respectively [8]. With regard to temperature requirement, onions require cool temperatures during juvenile phase and warmer temperatures during maturity.…”

Section: Introductionmentioning

confidence: 99%

Florogenesis and Female Gametophyte Development in <i>Allium cepa</i> L. cv. Krishnapuram

Lakshmi¹,

Raja²,

Naik³

et al. 2017

AJPS

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Florogenesis is one of the most complicated and interesting processes in the nature. This process involves developmental, physiological and molecular events leading to transformation from vegetative to reproductive phase for optimal seed production and the continuation of species. The basic knowledge about flowering processes, male and female sexual systems support basic and applied research and breeding programs. Most of the onion varieties from India are short day varieties, more diverse than other exotic germplasm and useful as a source of new alleles for supporting breeding programs. The present investigation was focused to study for the first time florogenesis process by scanning electron study for the first time florogenesis process by scanning electron microscopy (SEM) and development of female gametophytes by light microscopy in order to acquire basic knowledge useful for optimizing in vitro process to produce gynogenic haploid to support and speed breeding program in short-day onion Allium cepa L. cv. Krishnapuram (KP) or Bangalore Rose.This study revealed that shoot primordium differentiated into inflorescence meristem in the month of December, while seeds were planted in the field in the September. The individual florets are preceded by a variying number of floral initials. The female gametophyte developed from chalazal side megaspore. The embryo sac development is a bisporic Allium type showing shortlived antipodals. The histological study suggests that the use of big or preanthesis flower buds with embryo sac for production of gynogenic haploids to support breeding program in onion cv. Krishnapuram (KP). However further studies are needed for confirmation of this observation.

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Section: Introductionmentioning

confidence: 99%

Florogenesis and Female Gametophyte Development in <i>Allium cepa</i> L. cv. Krishnapuram

Lakshmi¹,

Raja²,

Naik³

et al. 2017

AJPS

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“…In addition to NFT, seven FT-like genes were identified in the bulbous species Allium cepa. AcFT2 appears to promote flowering time in response to temperature as well as photoperiod (Lee et al, 2013).…”

Section: (Pif3) Pif4 Flowering Locus M (Flm) and Terminal Flower1mentioning

confidence: 99%

“…In several previous studies PEBP family genes of bulbous plants were identified, in Allium cepa (onion), Allium sativum (garlic), Narcissus tazetta (daffodil), Crocus sativus (Saffron crocus) and Tulipa gesneriana (Tsaftaris et al, 2012;Lee et al, 2013;Noy-Porat et al, 2013;Kamenetsky et al, 2015;Leeggangers et al, submitted). In order to estimate the relationship between PEBP sequences of these bulbous plants, a phylogenetic analysis was performed (Fig.…”

Section: Phylogenetic Analysis Of Pebp Protein Sequences Identified Imentioning

confidence: 99%

“…In the study of Ho and Weigel (2014), it was shown that changing Leu-128 into a charged Lys in the AtFT protein resulted in a late flowering phenotype upon overexpression, mimicking weak TFL1 activity. TgFT2 with L128E substituted also undergoes a change from a hydrophobic to a charged residue, which in combination with the (Pin and Nilsson, 2012), PtFT1 in poplar (Hsu et al, 2011) and AcFT2 in A. cepa (Lee et al, 2013).…”

Section: The Power Of Amino Acid Substitutions In Tgft2 and Tgft3 Andmentioning

confidence: 99%

“…where AcFT1 acts as a promoter of bulbing and AcFT4 as inhibitor (Lee et al, 2013;Manoharan et al, 2016).…”

Section: Surprisingly Acft1 and Acft4 Have Been Shown To Be Involvedmentioning

confidence: 99%

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The hot, the cold and the tulip : the regulation of flowering time and dormancy release

Leeggangers

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Plant Reproduction

Brownfield

Twell

2016

Encyclopedia of Life Sciences

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Reproduction is required for the generation of new individuals. In land plants, reproduction can be asexual, where the offspring are genetically identical to the parent, or sexual, creating genetic variation. The life cycle of plants involves two alternating generations; a sporophyte that makes spores and a gametophyte that produces male and female gametes. During land plant evolution, this life cycle has altered from the gametophyte generation being the larger dominant generation to the sporophyte being the dominant plant we are familiar with. The structures that make spores and gametes, and the way reproductive cells are exchanged and dispersed, have also altered greatly as plants became better adapted to living in drier environments. Reproduction in the flowering plants has been extensively studied due to their economic importance, and we are beginning to uncover intriguing details of the molecular events that control critical aspects of the process in model and crop plants. Key Concepts Asexual reproduction produces genetically identical offspring and is beneficial under good conditions. Plants alternate between a diploid spore‐producing generation and a haploid gamete‐producing generation. In plants, spores are produced by meiosis and can be either released into the environment (bryophytes and nonseed plants) or develop within maternal tissues (seed plants). Distinct male and female gametes are produced in plants by mitotic divisions of haploid cells. Pollen is an evolutionary advance as it enables the dispersal and the delivery of the male gametes to the female gametes in the absence of free water. Seeds aid in the dispersal of offspring by providing a protective coat and a nutrition source to support seedlings during germination. The time of flowering is controlled through both internal signals and environmental cues, which control the production of a flower promoting protein. The development of the male and female gametophytes in flowering plants requires precise regulation to ensure the correct cell types are generated in the correct locations. Pollination is the process by which a pollen grain lands on a receptive female and grows a pollen tube through the female tissue towards an ovule. Seed development in flowering plants requires two fertilisation events (double fertilisation) to produce the embryo and an endosperm needed for seed development.

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FLOWERING LOCUS T genes control onion bulb formation and flowering

Cited by 208 publications

References 58 publications

Florogenesis and Female Gametophyte Development in <i>Allium cepa</i> L. cv. Krishnapuram

Florogenesis and Female Gametophyte Development in <i>Allium cepa</i> L. cv. Krishnapuram

The hot, the cold and the tulip : the regulation of flowering time and dormancy release

Plant Reproduction

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FLOWERING LOCUS T genes control onion bulb formation and flowering

Cited by 208 publications

References 58 publications

Florogenesis and Female Gametophyte Development in &lt;i&gt;Allium cepa&lt;/i&gt; L. cv. Krishnapuram

Florogenesis and Female Gametophyte Development in &lt;i&gt;Allium cepa&lt;/i&gt; L. cv. Krishnapuram

The hot, the cold and the tulip : the regulation of flowering time and dormancy release

Plant Reproduction

Contact Info

Product

Resources

About

Florogenesis and Female Gametophyte Development in <i>Allium cepa</i> L. cv. Krishnapuram

Florogenesis and Female Gametophyte Development in <i>Allium cepa</i> L. cv. Krishnapuram