Loquat fruit ripening is associated with root depletion. Nutritional and hormonal control

Reig, Carmina; Mesejo, Carlos; Martínez‐Fuentes, Amparo; Martínez‐Alcántara, Belén; Agustí, Manuel

doi:10.1016/j.jplph.2014.12.016

Cited by 7 publications

(2 citation statements)

References 47 publications

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“…Curiously, this anomalous behavior simulated that of subtropical fruit perennial species, such as the Loquat tree ( Eriobotrya japonica ) and other perennial fruit species, e.g. citrus trees [ 44 , 45 ]. The latter usually rest in the summer, bloom in the autumn, and proceed to the fruit set, development and ripening stage in the winter and early spring, which concludes just before the emergence of new vegetative growth.…”

Section: Discussionmentioning

confidence: 99%

Seasonal variation in non-structural carbohydrates, sucrolytic activity and secondary metabolites in deciduous and perennial Diospyros species sampled in Western Mexico

et al. 2017

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This study was performed to test the working hypothesis that the primary determinants influencing seasonal driven modifications in carbon mobilization and other key biochemical parameters in leaves of poorly known Diospyros digyna (Ddg; semi-domesticated; perennial) and D. rekoi (Dre; undomesticated; deciduous) trees are determined by environmental growing conditions, agronomic management and physiological plasticity. Thus, biochemical changes in leaves of both trees were recorded seasonally during two successive fruiting years. Trees were randomly sampled in Western Mexico habitats with differing soil quality, climatic conditions, luminosity, and cultivation practices. Leaves of Ddg had consistently higher total chlorophyll contents (CT) that, unexpectedly, peaked in the winter of 2015. In Dre, the highest leaf CT values recorded in the summer of 2015 inversely correlated with low average luminosity and high Chl a/ Chlb ratios. The seasonal CT variations in Dre were congruent with varying luminosity, whereas those in Ddg were probably affected by other factors, such as fluctuating leaf protein contents and the funneling of light energy to foliar non-structural carbohydrates (NSCs) accumulation, which were consistently higher than those detected in Dre leaves. Seasonal foliar NSC fluctuations in both species were in agreement with the carbon (C) demands of flowering, fruiting and/ or leaf regrowth. Seasonal changes in foliar hexose to sucrose (Hex/ Suc) ratios coincided with cell wall invertase activity in both species. In Dre, high Hex/ Suc ratios in spring leaves possibly allowed an accumulation of phenolic acids, not observed in Ddg. The above results supported the hypothesis proposed by showing that leaf responses to changing environmental conditions differ in perennial and deciduous Diospyros trees, including a dynamic adjustment of NSCs to supply the C demands imposed by reproduction, leaf regrowth and, possibly, stress.

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Section: Discussionmentioning

confidence: 99%

Seasonal variation in non-structural carbohydrates, sucrolytic activity and secondary metabolites in deciduous and perennial Diospyros species sampled in Western Mexico

et al. 2017

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“…However, hand thinning is an expensive, labour-intensive practice, and the skilled workforce needed to perform this operation is increasingly difficult to find [ 30 , 31 ]. The purpose of flower/fruitlet thinning in fruit trees is dual: (i) to reduce fruit load, improve sink-source balance and decrease competition among fruits, thus obtaining bigger fruits with improved fruit-quality parameters at harvest, and (ii) to avoid biennial bearing by removing the source of floral induction inhibition (i.e., the fruits), especially in terms of inhibitory signals, such as the GAs [ 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

A gibberellin-assisted study of the transcriptional and hormonal changes occurring at floral transition in peach buds (Prunus persica L. Batsch)

Girardi,

Canton,

Populin

et al. 2024

BMC Plant Biol

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Background Flower load in peach is an important determinant of final fruit quality and is subjected to cost-effective agronomical practices, such as the thinning, to finely balance the sink-source relationships within the tree and drive the optimal amount of assimilates to the fruits. Floral transition in peach buds occurs as a result of the integration of specific environmental signals, such as light and temperature, into the endogenous pathways that induce the meristem to pass from vegetative to reproductive growth. The cross talk and integration of the different players, such as the genes and the hormones, are still partially unknown. In the present research, transcriptomics and hormone profiling were applied on bud samples at different developmental stages. A gibberellin treatment was used as a tool to identify the different phases of floral transition and characterize the bud sensitivity to gibberellins in terms of inhibition of floral transition. Results Treatments with gibberellins showed different efficacies and pointed out a timeframe of maximum inhibition of floral transition in peach buds. Contextually, APETALA1 gene expression was shown to be a reliable marker of gibberellin efficacy in controlling this process. RNA-Seq transcriptomic analyses allowed to identify specific genes dealing with ROS, cell cycle, T6P, floral induction control and other processes, which are correlated with the bud sensitivity to gibberellins and possibly involved in bud development during its transition to the reproductive stage. Transcriptomic data integrated with the quantification of the main bioactive hormones in the bud allowed to identify the main hormonal regulators of floral transition in peach, with a pivotal role played by endogenous gibberellins and cytokinins. Conclusions The peach bud undergoes different levels of receptivity to gibberellin inhibition. The stage with maximum responsiveness corresponded to a transcriptional and hormonal crossroad, involving both flowering inhibitors and inductors. Endogenous gibberellin levels increased only at the latest developmental stage, when floral transition was already partially achieved, and the bud was less sensitive to exogenous treatments. A physiological model summarizes the main findings and suggests new research ideas to improve our knowledge about floral transition in peach.

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Soil Temperature Regulates Fruit Color Change in ‘Algerie’ Loquat: Nutritional and Hormonal Control

Reig

Grillone

Mesejo

et al. 2016

J Plant Growth Regul

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Loquat fruit ripening is associated with root depletion. Nutritional and hormonal control

Cited by 7 publications

References 47 publications

Seasonal variation in non-structural carbohydrates, sucrolytic activity and secondary metabolites in deciduous and perennial Diospyros species sampled in Western Mexico

Seasonal variation in non-structural carbohydrates, sucrolytic activity and secondary metabolites in deciduous and perennial Diospyros species sampled in Western Mexico

A gibberellin-assisted study of the transcriptional and hormonal changes occurring at floral transition in peach buds (Prunus persica L. Batsch)

Soil Temperature Regulates Fruit Color Change in ‘Algerie’ Loquat: Nutritional and Hormonal Control

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