Cell wall enzymes and changes in sugar content in pollinated orchids treated with ethylene inhibitors and sugars

Razali, Asbah; Boyce, Amru Nasrulhaq; Nair, H.; Somasundram, Chandran

doi:10.1016/j.scienta.2013.04.034

“…This sucrose peak in the leaf, together with sustained sensitivity to glucose, likely caused the earlier senescence and stronger photosynthetic rate declines in this treatment, possibly through the Tre6P signalling pathway (Lunn et al ., 2014). Whether sugar translocation may be slowed by the inactivation of the ethylene response or by other effects of STS remains unknown, given that there are few records regarding the effect of STS on sugar metabolism in the literature, and these mainly focus on its role in prolonging the life of cut flowers (Meir et al ., 2013; Razali et al ., 2013). Ethylene has also been shown to induce sucrose transporter gene expression in grape berries ( Vitis vinifera L.) and rubber tree ( Hevea brasiliensis M ü ll.Arg.)…”

Section: Discussionmentioning

confidence: 99%

Bulb growth potential is independent of leaf longevity for the spring ephemeralErythronium americanumKer-Gawl

Bertrand

¹

,

Lapointe

²

2022

Preprint

0

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Growth in most spring ephemerals is decreased under warmer temperatures. Although photosynthetic activities are improved at warmer temperatures, leaves senesce earlier, which prevents the bulb from reaching a larger size. A longer leaf life duration during a warm spring, therefore, may improve bulb mass. We tested this hypothesis by modulating leaf life span of Erythronium americanum through the application of Promalin® (PRO; cytokinins and gibberellins) that prolonged, or silver thiosulphate (STS) that reduced leaf duration. Gas exchange and chlorophyll fluorescence were measured along with leaf and bulb carbohydrate concentrations. Plants were also pulse labelled with 13CO2 to monitor sugar transport to the bulb. Lower photosynthetic rates and shorter leaf life span of STS plants reduced the quantity of C that they assimilated during the season, resulting in a smaller bulb compared to Control plants. PRO plants maintained their photosynthetic rates for a longer period than Control plants, yet final bulb biomass did not differ between them. We conclude that seasonal growth for E. americanum is not limited by leaf life duration under warm growing conditions, but rather by limited sink growth capacity. Under global warming, spring geophytes might be at risk of being reduced in size and eventually, reproducing less frequently.HighlightWarmer springs negatively affect trout lily growth and delaying leaf senescence in this spring ephemeral does not translate into a larger bulb if temperatures remain high during springtime.

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“…This sucrose peak in the leaf, together with sustained sensitivity to glucose, likely caused the earlier senescence and stronger photosynthetic rate declines in this treatment, possibly through the Tre6P signalling pathway (Lunn et al, 2014). Whether sugar translocation may be slowed by the inactivation of the ethylene response or by other effects of STS remains unknown, given that there are few records regarding the effect of STS on sugar metabolism in the literature, and these mainly focus on its role in prolonging the life of cut flowers (Meir et al, 2013;Razali et al, 2013). Ethylene has also been shown to induce sucrose transporter gene expression in grape berries (Vitis vinifera L.) and rubber tree (Hevea brasiliensis Müll.Arg.)…”

Section: Promalin and Silver Thiosulphate Modulation Of Source-sink S...mentioning

confidence: 99%

Bulb growth potential is independent of leaf longevity for the spring ephemeralErythronium americanumKer-Gawl.

Bertrand

¹

,

Lapointe

²

2022

Journal of Experimental Botany

View full text Add to dashboard Cite

Growth in most spring ephemerals is decreased under warmer temperatures. Although photosynthetic activities are improved at warmer temperatures, leaves senesce earlier, which prevents the bulb from reaching a larger size. A longer leaf life duration during a warm spring, therefore, may improve bulb mass. We tested this hypothesis by modulating leaf life span of Erythronium americanum through the application of Promalin® (PRO; cytokinins and gibberellins) that prolonged, or silver thiosulphate (STS) that reduced leaf duration. Gas exchange and chlorophyll fluorescence were measured along with leaf and bulb carbohydrate concentrations. Plants were also pulse labelled with 13CO2 to monitor sugar transport to the bulb. Lower photosynthetic rates and shorter leaf life span of STS plants reduced the quantity of C that they assimilated during the season, resulting in a smaller bulb compared to Control plants. PRO plants maintained their photosynthetic rates for a longer period than Control plants, yet final bulb biomass did not differ between them. We conclude that seasonal growth for E. americanum is not limited by leaf life duration under warm growing conditions, but rather by limited sink growth capacity. Under global warming, spring geophytes might be at risk of being reduced in size and eventually, reproducing less frequently.

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Developmental changes in cellular structure and cell wall metabolism of torch ginger ( Etlingera elatior (Jack) R.M. Smith) inflorescence

Choon

¹

,

Ding

²

2017

Current Plant Biology

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Cell wall enzymes and changes in sugar content in pollinated orchids treated with ethylene inhibitors and sugars

Cited by 4 publications

References 33 publications

Bulb growth potential is independent of leaf longevity for the spring ephemeralErythronium americanumKer-Gawl

Bulb growth potential is independent of leaf longevity for the spring ephemeralErythronium americanumKer-Gawl

Bulb growth potential is independent of leaf longevity for the spring ephemeralErythronium americanumKer-Gawl.

Developmental changes in cellular structure and cell wall metabolism of torch ginger ( Etlingera elatior (Jack) R.M. Smith) inflorescence

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