Pollination-induced senescence of Phalaenopsis petals

Porat, Ron; Borochov, Amihud; Halevy, A. H.; O’Neill, Sharman D.

doi:10.1007/bf00024102

Cited by 35 publications

(11 citation statements)

References 23 publications

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“…This phenomenon was also observed in our study and no petal abscission was observed but whole floral buds or flowers abscised. On the other hand, the wilting process and significant water loss as response to exogenous ethylene in our study are analogous to pollination-induced senescence of Phalaenopsis (Porat et al 1994). In contrast to roses and Kalanchoe, where big differences in sensitivity among cultivars were found (Müller et al 1999;Serek and Reid 2000), the differences in ethylene sensitivity among cultivars in the present study appear less dramatic.…”

Section: Discussioncontrasting

confidence: 75%

“…After pollination, cut Phalanenopsis flowers undergo rapid acceleration of the wilting process after 24 h. There was an increase in ethylene sensitivity occurring 4 h after pollination, reaching a peak 10 h after pollination, and all these changes happened before any increase in ethylene production (Porat et al 1994). Additionally, it has been suggested that pollination-induced changes in ethylene sensitivity in Phalaenopsis flowers are the cause triggering autocatalytic production of ethylene to its climacteric peak (Porat et al 1995).…”

Section: Introductionmentioning

confidence: 97%

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Effects of ethylene and 1-MCP (1-methylcyclopropene) on bud and flower drop in mini Phalaenopsis cultivars

et al. 2009

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Phalaenopsis frequently exhibits bud drop during production and in response to adverse postharvest conditions. The effect of exogenous ethylene on bud drop of mini Phalaenopsis was studied and ethylene sensitivity of four cultivars was compared. Water content, membrane permeability and ABA (abscisic acid) content in floral buds and flowers were determined after ethylene treatment. Exogenous ethylene induced flower bud drop in all testedPhalaenopsis cultivars and the different cultivars showed distinct differences in ethylene sensitivity. The cultivar Sogo 'Vivien' exhibited the highest bud drop, water loss and change in membrane permeability in floral petals, while Sogo 'Berry' showed the lowest sensitivity. The ethylene inhibitor 1-MCP (1-methylcyclopropene) reduced ethylene-induced floral bud drop in the cultivar Sogo 'Yenlin'. ABA content in floral buds was increased in response to ethylene and 1-MCP pretreatment inhibited the ethylene-induced increase in ABA levels efficiently. This finding suggests that the observed increase in ABA content during bud drop was mediated by ethylene. The interaction between ABA and ethylene is discussed.

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Section: Discussioncontrasting

confidence: 75%

Section: Introductionmentioning

confidence: 97%

Effects of ethylene and 1-MCP (1-methylcyclopropene) on bud and flower drop in mini Phalaenopsis cultivars

et al. 2009

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“…Floral changes following pollination occurred rapidly in most of the orchids studied and rapid senescence following pollination is widespread in several tropical orchid genera, e.g. Cymbidium , Phalaenopsis , Rhyncosytlis and Aerides (Arditti 1992; Porat et al. 1994; Attri et al.…”

Section: Discussionmentioning

confidence: 99%

“…O’Neill et al. (1993) and Porat et al. (1994, 1995) examined the physiological mechanism regulating post‐pollination changes.…”

Section: Discussionmentioning

confidence: 99%

Rapid floral senescence following male function and breeding systems of some tropical orchids

Huda

Wilcock

2011

Plant Biology

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No comparative study of floral senescence following male function among a range of tropical orchid genera has previously been undertaken. The timing and pattern of floral senescence and occurrence of fruit formation were studied following self-, geitonogamous and cross-pollination in 14 epiphytic and two terrestrial orchid species to determine their breeding system and assess the occurrence of floral abscission following pollinaria removal. Both pollination and pollinaria removal caused rapid floral senescence, and the pattern and timing of the floral changes were the same in all treatments. Six Dendrobium species and Pelatantheria insectifera were self-incompatible (SI) and eight other species, including one terrestrial species, were self-compatible (SC). Capsules produced from outcrossing in four SC species, Phalaenopsis cornu-cervi, Eria pubescens, Cleisostoma appendiculatum and Arundina graminifolia, were larger and heavier than those produced after selfing. Reductions in flower life span following pollinaria removal were positively correlated with flower size and longevity of unpollinated flowers but not with position in the inflorescence or nature of the breeding system. Rapid flower senescence following pollinaria removal reported here suggests that it may be widespread in tropical species. The significant association of the response with size of flowers and inflorescences among the species studied suggests that the cost of flower maintenance outweighs the benefit of remaining open for female function after pollinaria have been removed. Both SC and SI species were found among tropical orchids, but variation in capsule size following self- and cross-pollination indicates that there may be a reduction in seed production following selfing, even in SC species, and that fruit formation alone should not be taken as reliable evidence of full self-compatibility.

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“…Such inhibitors improve display life, in particular by delaying wilting and abscission of flowers and buds (Huang et al 1999;Ketsa and Luangsuwalai 1996;Ketsa and Rugkong 2000;Porat et al 1994Porat et al , 1995Zhang et al 1996).…”

Section: Introductionmentioning

confidence: 97%

Agrobacterium tumefaciens-mediated transformation of Oncidium and Odontoglossum orchid species with the ethylene receptor mutant gene etr1-1

Raffeiner

Serek

Winkelmann

2009

Plant Cell Tiss Organ Cult

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Oncidium and Odontoglosum orchid species have reduced display lives and are thus commercially less important than Phalaenopsis. One approach to prolonging display life permanently is to transform Oncidium and Odontoglossum with the ethylene receptor mutant gene etr1-1 from Arabidopsis under control of a flower specific promoter; this should reduce their sensitivity to exogenous ethylene. To achieve this it will be necessary to establish an efficient regeneration protocol using somatic embryogenesis and a routine Agrobacterium tumefaciens-mediated transformation procedure. Protocorm-like bodies (PLBs) of both orchid genera were regenerated from leaf tip explants. Leaf tips and PLBs, cultured in liquid and solid media, were compared as targets for genetic transformation. No transgenic shoots were obtained from leaf tips, while PLBs of Oncidium and Odontoglossum cultured on solid medium were successfully transformed with an expression vector containing nptII and gus genes driven by the cauliflower mosaic virus (CaMV) 35S promoter. Applying the A. tumefaciens strain EHA 105, transformation efficiencies of 1.3-2.7% were achieved for the investigated genotypes. Transformation with etr1-1 gene was achieved subsequently. Oncidium 'Sweet Sugar' has been successfully transformed and validated by PCR and Southern analysis.

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Pollination-induced senescence of Phalaenopsis petals

Cited by 35 publications

References 23 publications

Effects of ethylene and 1-MCP (1-methylcyclopropene) on bud and flower drop in mini Phalaenopsis cultivars

Effects of ethylene and 1-MCP (1-methylcyclopropene) on bud and flower drop in mini Phalaenopsis cultivars

Rapid floral senescence following male function and breeding systems of some tropical orchids

Agrobacterium tumefaciens-mediated transformation of Oncidium and Odontoglossum orchid species with the ethylene receptor mutant gene etr1-1

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