Photosynthetic and respiratory response of potato leaves of different ages during and after an episode of high temperature

Obiero, Charles; Milroy, S.P.; Bell, R.W.

doi:10.1111/jac.12391

Cited by 9 publications

(3 citation statements)

References 40 publications

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“…In the presence of thylakoid membrane damage, electron transfer and adenosine triphosphate phosphate synthesis are diminished, along with changes in photochemical reactions [ 24 ]. Our study showed that moderate and severe HS significantly reduced chlorophyll fluorescence parameters (Fv/Fm, ETR and qP) whilst substantially increasing NPQ, which agrees with earlier findings results in wheat, potato, tomato and other crops [ 22 , 25 ].…”

Section: Discussionsupporting

confidence: 93%

Leaf photosynthetic characteristics of waxy maize in response to different degrees of heat stress during grain filling

Qu,

Gu,

et al. 2023

BMC Plant Biol

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Background In the context of climate change, maize is facing unprecedented heat stress (HS) threats during grain filling. Understanding how HS affects yield is the key to reducing the impact of climate change on maize production. Suyunuo5 (SYN5) and Yunuo7 (YN7) were used as materials, and four temperature gradients of 28℃ (day)/20℃ (night; T0, control), 32 °C/24°C (T1, mild HS), 36 °C/28°C (T2, moderate HS), and 40 °C/32°C (T3, severe HS) were set up during grain filling to explore the physiological mechanism of different degrees HS affecting photosynthetic characteristics of leaves in this study. Results Results showed that HS accelerated the degradation of chlorophyll, disturbed the metabolism of reactive oxygen species, reduced the activity of antioxidant enzymes, and caused leaf damage. Heat stress induced the down-regulation of photosynthesis-related genes, which results in the decrease of enzymatic activities involved in photosynthesis, thereby inhibiting photosynthesis and reducing yield. Integrated analysis showed that the degree of the negative influence of three HS types during grain filling on leaves and yield was T3 > T2 > T1. The increase in HS disturbed leaf physiological activities and grain filling. Meanwhile, this study observed that the YN7 was more heat tolerance than SYN5 and thus it was recommended to use YN7 in waxy maize planting areas with frequent high temperatures. Conclusions Heat stress during grain filling caused premature senescence of the leaves by inhibiting the ability of leaves to photosynthesize and accelerating the oxidative damage of cells, thereby affecting the waxy maize yield. Our study helped to simulate the productivity of waxy maize under high temperatures and provided assistance for a stable yield of waxy maize under future climate warming.

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Section: Discussionsupporting

confidence: 93%

Leaf photosynthetic characteristics of waxy maize in response to different degrees of heat stress during grain filling

Qu,

Gu,

et al. 2023

BMC Plant Biol

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“…Under drought stress, stomatal factors are less regulated in aged leaves than in fully expanded young leaves. This senescence leads to a stronger inhibition of non‐stomatal factors in aged leaves than in fully expanded young leaves, which agrees with previous reports (David et al, 1998; Obiero et al 2020). Leaf senescence causes an increase in nonstomatal factor contributions to suppress P n under drought stress.…”

Section: Discussionsupporting

confidence: 93%

Drought responses and carbon allocation strategies of poplar with different leaf maturity

Yao,

Xia,

Yang

et al. 2024

Physiologia Plantarum

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Leaf characteristics can reflect the adaptation of trees to drought stress. However, the effect of leaf maturity on drought stress has been neglected, leading to uncertainty in inferring individual tree responses to drought from leaves. The allocation strategy of photosynthetic carbon between leaf organs (fully expanded young and old leaves) under drought stress remains unclear. Poplar is a diverse and widespread tree species in arid and semi‐arid regions. Here, three poplar genotypes (Populus cathayana, P. × euramericana ‘Nanlin 895’, and P. alba × P. tremula var. glandulosa) were selected and exposed to different watering regimes. The responses and carbon allocation strategies of leaves with different maturity to drought were investigated using a combination of leaf traits and 13C pulse labelling technique. The results showed that (1) fully expanded young leaves had better osmotic regulation and antioxidant capacity than aged leaves under drought stress. (2) Aged leaves acted as a carbon source during water deficit, where their photosynthetic products were transferred and supplied to upper young leaves to promote stronger photosynthesis in young leaves to acquire resources for tree growth. This study highlights that the effect of leaf maturity should be considered in the future when investigating the effects of drought on woody plants, especially for continuously growing tree species. Therefore, our study not only demonstrates the existence of leaf‐age‐dependent responses to drought in poplar but also provides new insights into carbon allocation at the leaf level.

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“…At the same time, the harmful effects of heat stress can be dependent not only on the damage of the photosynthetic apparatus but also on the activity of its defense and repair mechanisms (Murata et al 2007;Ivanov et al 2017). Moreover, not only the duration and quantity of heat stress determine the effects on photosynthesis but also the sensitivity of the tested plant genotypes or the developmental stages of the exhibited organs (Zhang et al 2012;Ruocco et al 2019;Obiero et al 2020). From this aspect, the photosynthetic thermotolerance and energy-dependent defense responses of plants upon heat stress can be mediated by several phytohormones such as abscisic acid (ABA), jasmonic acid (JA) (Hu et al 2020), or ET (Figs.…”

Section: Involvement Of Ethylene In the Regulation Of Photosynthetic Components Under Heat Stressmentioning

confidence: 99%

Ethylene involvement in the regulation of heat stress tolerance in plants

et al. 2021

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Because of the rise in global temperature, heat stress has become a major concern for crop production. Heat stress deteriorates plant productivity and alters phenological and physiological responses that aid in precise monitoring and sensing of mildto-severe transient heat stress. Plants have evolved several sophisticated mechanisms including hormone-signaling pathways to sense heat stimuli and acquire heat stress tolerance. In response to heat stress, ethylene, a gaseous hormone, is produced which is indispensable for plant growth and development and tolerance to various abiotic stresses including heat stress. The manipulation of ethylene in developing heat stress tolerance targeting ethylene biosynthesis and signaling pathways has brought promising out comes. Conversely increased ethylene biosynthesis and signaling seem to exhibit inhibitory effects in plant growth responses from primitive to maturity stages. This review mainly focuses on the recent studies of ethylene involvement in plant responses to heat stress and its functional regulation, and molecular mechanism underlying the plant responses in the mitigation of heat-induced damages. Furthermore, this review also describes the crosstalk between ethylene and other signaling molecules under heat stress and approaches to improve heat stress tolerance in plants.

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Photosynthetic and respiratory response of potato leaves of different ages during and after an episode of high temperature

Cited by 9 publications

References 40 publications

Leaf photosynthetic characteristics of waxy maize in response to different degrees of heat stress during grain filling

Leaf photosynthetic characteristics of waxy maize in response to different degrees of heat stress during grain filling

Drought responses and carbon allocation strategies of poplar with different leaf maturity

Ethylene involvement in the regulation of heat stress tolerance in plants

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