Photosynthesis as related to xylem water potential and carbon dioxide concentration in Sitka spruce

Beadle, C. L.; Neilson, R. E.; Jarvis, P. G.; Talbot, H.

doi:10.1111/j.1399-3054.1981.tb02706.x

Cited by 28 publications

(3 citation statements)

References 36 publications

(26 reference statements)

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“…The accessibility of water is the most powerful factor which affects leaf gas exchange and tree growth (Levesque et al 2017). Many species maintain their maximum photosynthetic rates over a considerable range of water potentials in the field (Beadle et al 1981). In this study, Amax was higher at sites 1 and 4 where water supply was optimal, while decrease in PWP (-1.56 MPa) (see Bojovic et al 2022) most severely affected the group furthest from the riverbed (site 3).…”

Section: Discussionmentioning

confidence: 49%

Proximity to riverbed influences physiological response of adult pedunculate oak trees

Kesić,

Čater,

Orlović

et al. 2023

Topola

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The pedunculate oak (Quercus robur L.) is economically and ecologically one of the most significant tree species in Serbia, however, little is known about the influence of the riverbed distance and its water supply on ecophysiological responses of this species. Given the limited information on the light-response curve of photosynthesis for oaks in southwest Srem, Serbia, the aim of this paper is to enhance understanding of their ecophysiological responses in this context. Maximum assimilation rate (Amax), the quantum yield (F), and light compensation point (LCP) were compared in adult trees situated along the transect from the river: (1) close to the river, (2) intermediate, (3) farthest from the river, and (4) forest reserve (second closest), with the first three transects being managed forests and the last one being an unmanaged forest reserve. The measurements were conducted in July during the first evidence of drought. The highest Amax rates were measured in all light intensities on the site closest to the river and the smallest on the site that was most distant to the water source. The most efficient were trees close to the river and the ones in the forest reserve. No significant difference between compensation points was confirmed for the studied groups of trees, although the forest reserve trees showed slightly higher values. The results demonstrated clear response between transects, which followed the distance from the riverbed. Pedunculate oak's reliance on groundwater is in tight relation with ecophysiological processes in trees; groundwater depletion may threaten its survival in areas distant from the river.

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Section: Discussionmentioning

confidence: 49%

Proximity to riverbed influences physiological response of adult pedunculate oak trees

Kesić,

Čater,

Orlović

et al. 2023

Topola

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“…Reductions in leaf water potential as a consequence of drought positively correlated with a decline in assimilation rate, which was associated with stomatal closure (Anyia, and Herzog, 2003). Stomatal regulation which is of utmost importance when photosynthesis is concerned (Hsiao, 1973) wherein stomata play a pivotal role in controlling the balance between assimilation and transpiration (Beadle et al, 1981). It is necessary to have higher plant conductance to achieve higher canopy photosynthesis which would further lead to higher biological yield.…”

Section: Transpiration Rate (Tr) and Stomatal Conductance (Sc)mentioning

confidence: 99%

Morphological and physiological responses of dual purpose wheat (Triticum aestivum L.) to nitrogen and seed rates: A review

Ranjan

Gontia

Pal

et al. 2016

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Growing human population at alarming rate has forced the decline in fallow land available for grazing leading to excessive pressure on fodder production for livestock existence. Growing crops for dual purpose i.e. both grains and fodder together may be a good option for reducing this burden. Wheat may be a better option to mitigate the shortage of grains as well as fodder. Many works have been carried out in this direction considering wheat but the production has been a limitation. Among various agronomical methods, modifications of fertilizers concentrations and seed rate are very crucial which affect yield. Nitrogen is one of major components of fertilizers which plays crucial role in crop growth influencing major physiology including photosynthesis, protein synthesis, nucleic acids synthesis etc. Seed rate is directly related to canopy expansion and solar radiation interception, thereby strongly influencing the use of environmental resources by changing relative importance of intra and interplant competition for light, water and nutrients during crop development and thereby affects wheat yield. Looking at the importance of the issue, this review was carried out to get the information about the effect of seed rates and nitrogen levels on the forage and grain yield of dual purpose wheat genotypes for enhanced productivity.

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“…Numerous reports document nonstomatal limitations to photosynthesis associated with low water availability (Boyer 1971, Mohanty and Boyer 1976, Sharkey and Badger 1982, Teskey et al 1986, Kaiser 1987. These limitations may result from reductions in electron transport (Mohanty andBoyer 1976, Epron andDreyer 1992), photophosphorylation (Keck andBoyer 1974, Sharkey andBadger 1982), Calvin cycle or more generalized enzyme activity (Kaiser 1987, Martin andRuiz-Torres 1992) or mesophyll conductance (Beadle et al 1981, Grieu et al 1988. Reductions in mesophyll conductance may become particularly limiting for red spruce as XPP drops below −2.0 MPa (Beadle et al 1981).…”

Section: Temporal Differences In Gas Exchange Leaf Conductance and Xmentioning

confidence: 99%

Physiological changes in red spruce seedlings during a simulated winter thaw

et al. 1996

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We evaluated net photosynthesis, respiration, leaf conductance, xylem pressure potential (XPP) and cold hardiness in red spruce (Picea rubens Sarg.) seedlings exposed to either a continuous thaw (CT) or a daytime thaw with freezing nights (FN) for 8 days during mid-winter. Physiological differences between CT and FN seedlings were evident for all measured parameters. However, the temporal expression of treatment differences varied among parameters. When compared to FN seedlings, CT seedlings had higher rates of respiration following 24 h of treatment, and a higher net photosynthetic rate, leaf conductance and XPP after 48 h of treatment. The CT seedlings were significantly less cold tolerant than the FN seedlings following 4 days of thaw, whereas FN seedlings did not deharden over the 8 days of treatment. Examination of temporal trends among thaw-associated changes in physiology suggested that, although greater carbon exchange occurred as stomatal conductance increased, the transition from negative to positive net photosynthesis was not the result of increases in conductance, but may have been associated with thaw-induced increases in XPP. Because thaw-associated changes in gas exchange and cold hardiness were offset in time, we conclude that, if changes in these processes are physiologically linked, the linkage is indirect.

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Photosynthesis as related to xylem water potential and carbon dioxide concentration in Sitka spruce

Cited by 28 publications

References 36 publications

Proximity to riverbed influences physiological response of adult pedunculate oak trees

Proximity to riverbed influences physiological response of adult pedunculate oak trees

Morphological and physiological responses of dual purpose wheat (Triticum aestivum L.) to nitrogen and seed rates: A review

Physiological changes in red spruce seedlings during a simulated winter thaw

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