Plant Senescence and Organ Abscission

Gulfishan, Mohd; Jahan, Ajmat; Bhat, Tariq Ahmad; Sahab, Danish

doi:10.1016/b978-0-12-813187-9.00016-0

Cited by 19 publications

(16 citation statements)

References 130 publications

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“…Abscission, as an important biological process for plant survival and reproduction, is a highly coordinated event involving multiple changes in cell structure, metabolism, and gene expression [ 1 ]. Detachment of plant organs occurs at a predetermined position called the abscission zone (AZ) that develops at the junction between the leaving organ and the main plant body.…”

Section: Introductionmentioning

confidence: 99%

Thidiazuron Promotes Leaf Abscission by Regulating the Crosstalk Complexities between Ethylene, Auxin, and Cytokinin in Cotton

Liao

et al. 2022

IJMS

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Thidiazuron (TDZ) is widely used as a defoliant to induce leaf abscission in cotton. However, the underlying molecular mechanism is still unclear. In this study, RNA-seq and enzyme-linked immunosorbent assays (ELISA) were performed to reveal the dynamic transcriptome profiling and the change of endogenous phytohormones upon TDZ treatment in leaf, petiole, and abscission zone (AZ). We found that TDZ induced the gene expression of ethylene biosynthesis and signal, and promoted ethylene accumulation earlier in leaf than that in AZ. While TDZ down-regulated indole-3-acetic acid (IAA) biosynthesis genes mainly in leaf and IAA signal and transport genes. Furthermore, the IAA content reduced more sharply in the leaf than that in AZ to change the auxin gradient for abscission. TDZ suppressed CTK biosynthesis genes and induced CTK metabolic genes to reduce the IPA accumulation for the reduction of ethylene sensitivity. Furthermore, TDZ regulated the gene expression of abscisic acid (ABA) biosynthesis and signal and induced ABA accumulation between 12–48 h, which could up-regulate ABA response factor genes and inhibit IAA transporter genes. Our data suggest that TDZ orchestrates metabolism and signal of ethylene, auxin, and cytokinin, and also the transport of auxin in leaf, petiole, and AZ, to control leaf abscission.

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Section: Introductionmentioning

confidence: 99%

Thidiazuron Promotes Leaf Abscission by Regulating the Crosstalk Complexities between Ethylene, Auxin, and Cytokinin in Cotton

Liao

et al. 2022

IJMS

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“…Fruit detachment was lower in overripe bunches, as most of the outer layer fruits had detached prior to ethephon treatment. The control untreated bunches showed a high percentage of detachment due to the natural senescence activity that causes abscission [29]. The results suggest that ethephon-induced fruit detachment can be advantageous in commercial application, as oil palm bunches with mixed ripeness (predominantly ripe) cannot be avoided during harvesting.…”

Section: Effects Of Bunch Ripeness and Bunch Size On Ethephon-induced Fruit Detachmentmentioning

confidence: 91%

Postharvest Fruit Detachment in Oil Palm Bunches with Ethephon and Ethylene Gas Application

Balakrishnan¹,

Zakaria²,

Tan³

et al. 2021

Agriculture

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The processing of oil palm fresh fruit bunches (FFB), together with loose fruits, in the current mill operation contributes to oil loss and high free fatty acids (FFA), affecting crude palm oil quality. Fruit detachment induced by ethephon and ethylene may mitigate the current processing issues. This study shows that a 0.50% (v/v) ethephon application by the evaporation method induced the highest fruit detachment of 30.8 ± 1.1% after 24 h at room temperature, with the FFA content in the extracted crude palm oil at 0.34 ± 0.09%. Ethephon application was effective on bunches between 14 and 28 kg, and fruit detachment was higher in ripe and underripe bunches at 24.1 ± 0.9% and 23.2 ± 0.1%, respectively. A significant fruit detachment of 47.2 ± 2.4% was achieved when the bunches were also stripped mechanically, but the FFA content increased almost 4-fold, from 1.0 ± 0.2% to 3.8 ± 1.2%. The application of ethylene gas at 750 ppm yielded 29.4 ± 1.9% fruit detachment. The findings present the possibility of using ethylene as an indirect method for minimizing oil loss without increasing the FFA content in future crude palm oil production systems.

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“…Abscission in plants refers to the process by which some organs, including leaves, flowers, fruits, seeds, and petioles, grow to a certain extent and then are removed naturally from the plant itself. Normal organ abscission is often associated with maturation and senescence [ 72 ]. For instance, most fruits undergo abscission during ripening, and petals wither and fall from flowers after pollination and fertilization [ 73 ].…”

Section: Roles Of H 2 S At Different Stages Of mentioning

confidence: 99%

Crosstalk between Hydrogen Sulfide and Other Signal Molecules Regulates Plant Growth and Development

Xuan

Wang

et al. 2020

IJMS

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Hydrogen sulfide (H2S), once recognized only as a poisonous gas, is now considered the third endogenous gaseous transmitter, along with nitric oxide (NO) and carbon monoxide (CO). Multiple lines of emerging evidence suggest that H2S plays positive roles in plant growth and development when at appropriate concentrations, including seed germination, root development, photosynthesis, stomatal movement, and organ abscission under both normal and stress conditions. H2S influences these processes by altering gene expression and enzyme activities, as well as regulating the contents of some secondary metabolites. In its regulatory roles, H2S always interacts with either plant hormones, other gasotransmitters, or ionic signals, such as abscisic acid (ABA), ethylene, auxin, CO, NO, and Ca2+. Remarkably, H2S also contributes to the post-translational modification of proteins to affect protein activities, structures, and sub-cellular localization. Here, we review the functions of H2S at different stages of plant development, focusing on the S-sulfhydration of proteins mediated by H2S and the crosstalk between H2S and other signaling molecules.

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Plant Senescence and Organ Abscission

Cited by 19 publications

References 130 publications

Thidiazuron Promotes Leaf Abscission by Regulating the Crosstalk Complexities between Ethylene, Auxin, and Cytokinin in Cotton

Thidiazuron Promotes Leaf Abscission by Regulating the Crosstalk Complexities between Ethylene, Auxin, and Cytokinin in Cotton

Postharvest Fruit Detachment in Oil Palm Bunches with Ethephon and Ethylene Gas Application

Crosstalk between Hydrogen Sulfide and Other Signal Molecules Regulates Plant Growth and Development

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