Developmental and Hormonal Control of Leaf Senescence

Schippers, Jos H. M.; Jing, Hai‐Chun; Hille, Jacques; Dijkwel, Paul P.

doi:10.1002/9780470988855.ch7

Cited by 87 publications

(59 citation statements)

References 211 publications

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“…Senescence involves the active turnover and recapture of cellular materials for use in the growing parts such as developing seeds (Schippers et al 2007). In our study, decline in green leaf area, Chl content, Cars, total soluble proteins, photosynthetic machinery, Rubisco activity and content and enhanced protein degradation are the common hallmarks of monocarpic senescence (Figs.…”

Section: Discussionmentioning

confidence: 99%

Wheat cultivars differing in heat tolerance show a differential response to monocarpic senescence under high-temperature stress and the involvement of serine proteases

Chauhan¹,

Srivalli²,

Nautiyal³

et al. 2009

Photosynt.

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High temperature is a common constraint during anthesis and grain-filling stages of wheat leading to huge losses in yield. In order to understand the mechanism of heat tolerance during monocarpic senescence, the present study was carried out under field conditions by allowing two well characterized Triticum aestivum L. cultivars differing in heat tolerance, Hindi62 (heat-tolerant) and PBW343 (heat-susceptible), to suffer maximum heat stress under late sown conditions. Senescence was characterized by measuring photosynthesis related processes and endoproteolytic activity during non-stress environment (NSE) as well as heat-stress environment (HSE). There was a faster rate of senescence under HSE in both the genotypes. Hindi62, having pale yellow flag leaf with larger area, maintained cooler canopy under high temperatures than PBW343. The tolerance for high temperature in Hindi62 was clearly evident in terms of slower green-leaf area degradation, higher stomatal conductance, higher stability in maximum PSII efficiency, Rubisco activity and Rubisco content than PBW343. Both the genotypes exhibited lower endopeptidase activity under HSE as compared to NSE and this difference was more apparent in Hindi62. Serine proteases are the predominant proteases responsible for protein degradation under NSE as well as HSE. Flag leaf of both the genotypes exhibited highmolecular-mass endoproteases (78 kDa and 67 kDa) isoforms up to full grain maturity which were inhibited by specific serine protease inhibitor in both the environments. In conclusion, the heat-tolerant Hindi62 exhibited a slower rate of senescence than the heat-susceptible PBW343 during HSE, which may contribute towards heat stability.

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Section: Discussionmentioning

confidence: 99%

Wheat cultivars differing in heat tolerance show a differential response to monocarpic senescence under high-temperature stress and the involvement of serine proteases

Chauhan¹,

Srivalli²,

Nautiyal³

et al. 2009

Photosynt.

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“…The naturally occurring IAA is synthesized within rapidly dividing tissues of root and shoot meristems, as well as in young leaves of plants (Ljung et al 2001(Ljung et al , 2005. However, the relationship between IAA and stress-induced plant responses varies, depending on plant species or tissue age, and the plant responses during stress are likely dependent upon both the IAA concentration and the cellular responsiveness or sensitivity (Schippers et al 2007). In the current study, there was a significant increase in leaf IAA due to drought stress for creeping bentgrass plants regardless of CO 2 concentration, whereas plants at elevated CO 2 had lower IAA content than that at ambient CO 2 .…”

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confidence: 99%

Stimulation of Growth and Alteration of Hormones by Elevated Carbon Dioxide for Creeping Bentgrass Exposed to Drought

et al. 2019

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Drought stress inhibits shoot growth of cool‐season turfgrass species, and elevated CO2 concentration may mitigate the adverse effects of drought through alteration of hormone production. The objective of this study was to determine whether elevated CO2–enhanced drought tolerance in creeping bentgrass (Agrostis stolonifera L.) was associated with the stimulation of tiller and stolon growth and the alteration of stress‐regulating and growth‐regulating hormone accumulation. Creeping bentgrass (cv. Penncross) plants were established for 24 d at ambient (400 μL L−1) or elevated (800 μL L−1) CO2 concentration and subsequently exposed to drought stress for 23 d by withholding irrigation. Drought stress caused significant reduction in leaf relative water content and tiller density, whereas both parameters, as well as stolon length, were maintained at significantly higher values in CO‐treated plants compared with those at ambient CO2 under drought stress. The positive effects of elevated CO2 on the maintenance of leaf hydration and the promotion of tiller density and stolon growth in creeping bentgrass exposed to drought stress could be associated with the suppression of drought‐induced accumulation of abscisic acid and the increase in the endogenous content of isopentenyladenosine, jasmonic acid, and the jasmonic acid precursor 12‐oxo‐phytodienoic acid. These results suggest that the elevated CO2–enhanced growth of tillers and stolons in creeping bentgrass under drought stress could be regulated in part by the adjustment of endogenous hormone levels.

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“…Although we know that auxin's effects on abscission and senescence was first reported >50 years ago [57], the involvement of this hormone in senescence is much less understood than that of ABA, ethylene, or CKs, and it is difficult to conclude that it antagonizes senescence [58]. Therefore, although a low IAA content could stimulate senescence on the basis that this compound has been generally seen as a senescence-retarding factor [59] decreases the expression of the SAG12 (senescence promoter) [60]; however it seems unlikely to be a primary factor in the onset of salt-induced senescence, but probably could interactions with other hormones, such as ethylene, and metabolic fluxes [59].…”

Section: Discussionmentioning

confidence: 99%

Metapontum Forest Reserve: Salt Stress Responses in <i>Pinus halepensis</i>

Rocco¹,

Lomaglio²,

Loperte³

et al. 2013

AJPS

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Metapontum Forest Reserve is an artificial formation located between mouths of Bradano and Basento river, it is composed prevalently of Aleppo pine (Pinus halepensis). In recent years, the Metapontum coast is characterized by a strong erosive process which has really removed the dune behind the beach moving in the inland and causing the decline of the historical pinewood. This negative effect on plant was induced by an increase in soil salinity, which is one of the major abiotic stresses. A clear understanding of the molecular mechanisms involved in plants response to salt stress is fundamentally important for plant biology. The salinity soil causes broad variety of physiological and biochemical processes, as oxidative damage, also has a negative effect on energy metabolism, which unavoidably resulted in a decreased ATP production through photophosphorylation and, thus, affected the Calvin cycle in photosynthesis. A proteomic approach was utilized to identify key protein which result to be directly responsive to salt stress. Total proteins were extracted from the leaves by a combination of TCA-acetone and phenol, and separated by two-dimensional gel electrophoresis at pH 5 -8. Spots were stained with Coomassie Brilliant Blue and analyzed with the software PDQuest 8.0 (Bio-Rad) to identify differentially expressed polypeptides. Preliminary analysis revealed around 29 differentially expressed proteins, and they were sequenced by MALDI TOF and LC-MS/MS. Sequenced spots were classified in different functional classes.

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Developmental and Hormonal Control of Leaf Senescence

Cited by 87 publications

References 211 publications

Wheat cultivars differing in heat tolerance show a differential response to monocarpic senescence under high-temperature stress and the involvement of serine proteases

Wheat cultivars differing in heat tolerance show a differential response to monocarpic senescence under high-temperature stress and the involvement of serine proteases

Stimulation of Growth and Alteration of Hormones by Elevated Carbon Dioxide for Creeping Bentgrass Exposed to Drought

Metapontum Forest Reserve: Salt Stress Responses in <i>Pinus halepensis</i>

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Developmental and Hormonal Control of Leaf Senescence

Cited by 87 publications

References 211 publications

Wheat cultivars differing in heat tolerance show a differential response to monocarpic senescence under high-temperature stress and the involvement of serine proteases

Wheat cultivars differing in heat tolerance show a differential response to monocarpic senescence under high-temperature stress and the involvement of serine proteases

Stimulation of Growth and Alteration of Hormones by Elevated Carbon Dioxide for Creeping Bentgrass Exposed to Drought

Metapontum Forest Reserve: Salt Stress Responses in &lt;i&gt;Pinus halepensis&lt;/i&gt;

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Metapontum Forest Reserve: Salt Stress Responses in <i>Pinus halepensis</i>