Photosynthesis in response to sink-source manipulations during different phenological stages of fruit development in peach trees: regulation by stomatal aperture and leaf temperature

Li, W. D.; Li, S. H.; Yang, Shengcai; Yang, Jie; Zheng, Xiaodong; Li, X. D.; Yao, Hairui

doi:10.1080/14620316.2005.11511964

Cited by 24 publications

(19 citation statements)

References 26 publications

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“…1G,H). These results are in agreement with our previous studies on peach trees (Li et al 2001(Li et al , 2005(Li et al , 2007, indicating that reducing sink demand, here by girdling the branch between the source leaves and the root system including tubers, could inhibit P N of source leaves in a manner similar to that after removing fruits in peach trees. The lower g s and increased T l occurred around noon when PAR was high (Fig.…”

Section: Discussionsupporting

confidence: 93%

“…It was the first theory explaining the decline of photosynthetic capacity after weakened sink demand (Herold 1980, Layne and Flore 1995, Quereix et al 2001). However, this hypothesis still remains to be conclusively proven (Nautiyal et al 1999, Li et al 2001, Li et al 2005. For example, low sink demand after fruit removal decreased P N without influencing accumulation of sugars in leaves Ferree 1986, Marcelis 1991), and accumulation of sugars in leaves did not result in decreasing P N under low sink demand (Roper ⎯⎯⎯⎯ Received 24 March 2008, accepted 15 October 2009.…”

Section: Introductionmentioning

confidence: 94%

“…Decreased CO 2 assimilation resulting from a low sink strength may therefore be regulated by some mechanism other than the end product inhibition of the activities of related biosynthetic enzymes. Two factors, decreased stomatal aperture and increased leaf temperature (T l ), play an important role in regulating P N under a lower sink-source ratio, indicating that the low stomatal conductance (g s ) should be a trigger or promoter of reduced P N and the high T l a regulator of P N under a lower sink demand (Li et al 2001(Li et al , 2005. Thus, decreased P N under lower sink demand might be caused by both non-stomatal and stomatal limitations (Wu et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Photosynthesis and chlorophyll fluorescence response to low sink demand of tubers and roots in Dahlia pinnata source leaves

Yan¹,

Li³

et al. 2011

Biologia plant.

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Photosynthetic rate (P N ) and chlorophyll (Chl) fluorescence induction of source leaves in response to a low sink demand created by girdling the branch (GB) between the root-tuber-system and the leaves were studied in Dahlia pinnata L. cv. Rigolet during the stage of rapid tuber growth in the greenhouse. GB resulted in significantly lower values of P N , stomatal conductance (g s ), and transpiration rate (E), but in higher leaf temperature (T l ) compared with those of controls. With exception of maximum quantum yield of photosystem 2 (PS 2) photochemistry (F v /F m ) and maximum ratio of quantum yields of photochemical and concurrent non-photochemical processes in PS 2 (F v /F 0 ), no significant differences were observed in Chl fluorescence parameters between girdled and control leaves on days 1 and 2 after GB, indicating no apparent damage in the photosynthetic apparatus. However, longer girdling duration resulted in higher non-photochemical Chl fluorescence quenching (NPQ), but lower F v /F 0 , actual efficiency of energy conversion in PS 2 under steady-state conditions (Ф PS2 ), and photochemical quenching coefficient (qP) in comparison with controls from 10:00 to 16:00 or 15:00 on days 4 and 5, respectively, indicating reversible injury in the photosynthetic apparatus.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Photosynthesis and chlorophyll fluorescence response to low sink demand of tubers and roots in Dahlia pinnata source leaves

Yan¹,

Li³

et al. 2011

Biologia plant.

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“…A specific g s corresponded with lower CWSI values at pre-harvest than post-harvest stage. It has been reported that fruit removal significantly decreases the net photosynthesis rate, stomatal conductance and transpiration rate, and increased leaf temperature around midday [39]. Therefore, the higher CWSI values of post-harvest can be explained because of the reduction on the transpiration rate and thereby leaf evaporative cooling.…”

Section: Discussionmentioning

confidence: 95%

Airborne Thermal Imagery to Detect the Seasonal Evolution of Crop Water Status in Peach, Nectarine and Saturn Peach Orchards

et al. 2016

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In the current scenario of worldwide limited water supplies, conserving water is a major concern in agricultural areas. Characterizing within-orchard spatial heterogeneity in water requirements would assist in improving irrigation water use efficiency and conserve water. The crop water stress index (CWSI) has been successfully used as a crop water status indicator in several fruit tree species. In this study, the CWSI was developed in three Prunus persica L. cultivars at different phenological stages of the 2012 to 2014 growing seasons, using canopy temperature measurements of well-watered trees. The CWSI was then remotely estimated using high-resolution thermal imagery acquired from an airborne platform and related to leaf water potential (Ψ L ) throughout the season. The feasibility of mapping within-orchard spatial variability of Ψ L from thermal imagery was also explored. Results indicated that CWSI can be calculated using a common non-water-stressed baseline (NWSB), upper and lower limits for the entire growing season and for the three studied cultivars. Nevertheless, a phenological effect was detected in the CWSI vs. Ψ L relationships. For a specific given CWSI value, Ψ L was more negative as the crop developed. This different seasonal response followed the same trend for the three studied cultivars. The approach presented in this study demonstrated that CWSI is a feasible method to assess the spatial variability of tree water status in heterogeneous orchards, and to derive Ψ L maps throughout a complete growing season. A sensitivity analysis of varying pixel size showed that a pixel size of 0.8 m or less was needed for precise Ψ L mapping of peach and nectarine orchards with a tree crown area between 3.0 to 5.0 m 2 .

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“…Leaves exposed directly to the sun may not be fully adapted to high light in June, and therefore more prone to closed stomata. The stomatal conductance could also have been affected by the sprays of sulphur and/or potassium bicarbonate in the unshielded control, as shown earlier by McAfee and Rom (2003), or simply due to differences in source-sink relationships as related to light intensity and discussed by Li et al (2005).…”

Section: Discussionmentioning

confidence: 77%

Protective rain shields alter leaf microclimate and photosynthesis in organic apple production

Kjær¹

2016

Acta Hortic.

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Plastic rain shields reduce the leaf and fruit wetness and protect apple trees against major leaf diseases and hail damage. Shielding the trees may reduce incoming radiation, especially in the ultraviolet (UV) region of the light spectrum, and affect the microclimate and photosynthesis. In July of 2014 and June of 2015, we measured the leaf microclimate and photosynthetic performance using chlorophyll fluorescence and gas exchange in the apple cultivar 'Santana' grown in three treatments. In one treatment the trees were exposed to natural light and sprayed (control), and in two treatments the trees were unsprayed and shielded with a plastic film not permeable to UV-light (UV-) or a plastic film permeable to UV-light (UV+). The light transmittance was reduced in the shielded treatments, protecting the leaves from high solar irradiance during noon on sunny days, and avoiding afternoon depression of photosynthesis. Due to this, the leaf photosynthetic rates were often higher in the protected trees in comparison to the control trees at similar high light intensities, whereas there were no differences between treatments on cloudy days. The effect of the UV+ film on photosynthesis did not differ from the UV-film, except there was a tendency for higher values accompanied with increased light transmittance of the UV+ film. We conclude that a microclimate with more diffused light maintained the photosynthetic yield, despite a lower light level under the rain shields.

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Photosynthesis in response to sink-source manipulations during different phenological stages of fruit development in peach trees: regulation by stomatal aperture and leaf temperature

Cited by 24 publications

References 26 publications

Photosynthesis and chlorophyll fluorescence response to low sink demand of tubers and roots in Dahlia pinnata source leaves

Photosynthesis and chlorophyll fluorescence response to low sink demand of tubers and roots in Dahlia pinnata source leaves

Airborne Thermal Imagery to Detect the Seasonal Evolution of Crop Water Status in Peach, Nectarine and Saturn Peach Orchards

Protective rain shields alter leaf microclimate and photosynthesis in organic apple production

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