Root temperature drives winter acclimation of shoot water relations in Cryptomeria japonica seedlings

Norisada, Mariko; Hara, Masashi; Yagi, Hironori; Tange, Takeshi

doi:10.1093/treephys/25.11.1447

Cited by 12 publications

(9 citation statements)

References 36 publications

(41 reference statements)

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“…Each symbol is the mean value of five replications (± SD). Norisada et al 2005;Veselova et al 2005). In fact, minimum nocturnal T AIR was around 10 ºC in winter, whereas it varied around 18 ºC during the summer season (data not shown).…”

Section: Discussionmentioning

confidence: 83%

“…In fact, both alternatives may explain the lower g S found in winter, when mean C i values were around 27 % higher compared to summer values [227.2 vs. 179.0 μmol(CO 2 ) mol -1 in winter and summer, respectively]. In addition, low soil temperatures disrupt root functionality and decrease shoot hydration due to an increase in plant hydraulic resistance (Syvertsen et al 1983;Moreshet and Green 1984;Norisada et al 2005). Soil temperature reached around 9.4 ºC at 10 cm depth during the winter season (data not shown), causing significant differences in whole-plant leaf specific hydraulic conductance between seasons.…”

Section: Discussionmentioning

confidence: 99%

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Photosynthesis and water relations of well-watered orange plants as affected by winter and summer conditions

Ribeiro¹,

Machado²,

Santos³

et al. 2009

Photosynt.

111

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The aim of this study was to evaluate how the summer and winter conditions affect the photosynthesis and water relations of well-watered orange trees, considering the diurnal changes in leaf gas exchange, chlorophyll (Chl) fluorescence, and leaf water potential (Ψ) of potted-plants growing in a subtropical climate. The diurnal pattern of photosynthesis in young citrus trees was not significantly affected by the environmental changes when compared the summer and winter seasons. However, citrus plants showed higher photosynthetic performance in summer, when plants fixed 2.9 times more CO 2 during the diurnal period than in the winter season. Curiously, the winter conditions were more favorable to photosynthesis of citrus plants, when considering the air temperature (< 29 ºC), leaf-to-air vapor pressure difference (< 2.4 kPa) and photon flux density (maximum values near light saturation) during the diurnal period. Therefore, low night temperature was the main environmental element changing the photosynthetic performance and water relations of well-watered plants during winter. Lower whole-plant hydraulic conductance, lower shoot hydration and lower stomatal conductance were noticed during winter when compared to the summer season. In winter, higher ratio between the apparent electron transport rate and leaf CO 2 assimilation was verified in afternoon, indicating reduction in electron use efficiency by photosynthesis. The high radiation loading in the summer season did not impair the citrus photochemistry, being photoprotective mechanisms active. Such mechanisms were related to increases in the heat dissipation of excessive light energy at the PSII level and to other metabolic processes consuming electrons, which impede the citrus photoinhibition under high light conditions.

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Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Photosynthesis and water relations of well-watered orange plants as affected by winter and summer conditions

Ribeiro¹,

Machado²,

Santos³

et al. 2009

Photosynt.

111

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“…Despite studies assessing the impact of chilling stress on the water relations of trees have been studied for decades (Kramer 1942;Running and Reid 1980;Pavel and Fereres 1998;Norisada et al 2005), actual observations under natural conditions are still lacking to date. To our knowledge, all studies have been conducted in either lab conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Wan et al 2001) or with plants growing outdoors that are exposed to localized warming or cooling (e.g. Norisada et al 2005). Furthermore, the reported experiments have always been conducted with young seedlings growing in either pots or hydroponics.…”

Section: Introductionmentioning

confidence: 99%

Low winter temperatures induce a disturbance of water relations in field olive trees

López-Bernal

García-Tejera

Testi

et al. 2015

Trees

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Author contribution statement AL, OG, LT, FO and FJV designed the experiments. AL and OG carried out the fieldwork. AL, OG, LT, FO and FJV analyzed the data and prepared the manuscript. Conflict of interestNone. Key MessageLow winter temperatures induce an increase in the soil-to-trunk hydraulic resistance of field-grown olive trees resulting in a significant disturbance of their water relations. AbstractA disturbance of water relations in response to chilling have long been observed in potted plants growing under controlled conditions, but information is lacking for field plants. The aim of this study was to assess the effects of winter low temperatures on the water relations of mature olive trees. To this end, water potential, sap flux density, soil temperature and meteorological data were monitored in a hedgerow olive orchard near Córdoba, southern Spain, throughout two consecutive winters. Water stress symptoms were found in terms of midday Ψ despite adequate water supply and low evaporative demand. These effects were associated with changes in the soil-to-trunk hydraulic resistance (R root ), which increased by December-January to much higher values than those previously reported in the literature, particularly in the year of higher fruit load. The contribution of viscosity (η) to the observed R root dynamics was almost negligible as deduced from measurements of soil temperature, so the high winter values of R root were likely to have originated from other causes such as reductions in membrane permeability and root growth.The findings of this work raise new major issues that deserve further research such as the impact of the winter water stress on stomatal conductance and photosynthesis rates in mature olive trees.

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“…While the soluble sugar dominated in September for the higher carbon assimilation and faster turnover of soluble sugar, starch was the main fraction of NSC and warming significantly decreased starch in the first three order roots and decreased soluble sugar concentration in the later three order roots. Increase of soluble carbohydrate content can be used to predict the cold acclimation process of a tree (Charrier and Améglio 2011), and high sugar concentration contributed to the lowering of tissue osmotic potential at full turgor (Norisada et al 2005), so the soluble sugar concentration was higher in December and especially in control. Starch is one component of stored carbohydrate, so its concentration was highest in December and became smaller in April after a non-growing season consumption.…”

Section: Discussionmentioning

confidence: 99%

Effects of night warming on spruce root around non-growing season vary with branch order and month

Yin

Xiao

et al. 2014

Plant Soil

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Background and aims The Root is an important plant organ and has high heterogeneity; how it responds to global warming is yet to be answered. This study examined the growth and physiological responses of fine roots to warming around the non-growing season. Methods Plants from 4-year-old Picea asperata were grown under experimental warming conditions. A detailed investigation was conducted by measuring biomass, triphenyltetrazolium chloride (TTC) reducing capacity, carbon (C) and nitrogen (N) concentration, nonstructural carbohydrate (NSC) of the primal five branch order roots in early (April) and late (September) growing seasons as well as in the non-growing season (December). Results Warming promoted fine root growth in April and fine root turnover was mostly in the first four orders. It decreased root C, N concentration in the early and late growing seasons but increased N concentration in the non-growing season. Moreover, it increased NSC concentration (especially soluble sugar) in April but decreased its concentration (soluble sugar and starch) in December. TTC reducing capacity in April was higher than in the other 2 months. Conclusions The effect of warming on tree roots varied with its branch order and month. The lower order (first three or four order, in general) roots were sensitive to warming, especially in April (early part of growing season) and December (non-growing season). Warming accelerated the carbon input from root to soil. It is indicated that any changes in winter temperatures could alter the sink strength of terrestrial ecosystems considerably. Moreover, TTC reducing capacity could reflect more information about root, but it was more sensitive than N concentration.

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Root temperature drives winter acclimation of shoot water relations in Cryptomeria japonica seedlings

Cited by 12 publications

References 36 publications

Photosynthesis and water relations of well-watered orange plants as affected by winter and summer conditions

Photosynthesis and water relations of well-watered orange plants as affected by winter and summer conditions

Low winter temperatures induce a disturbance of water relations in field olive trees

Effects of night warming on spruce root around non-growing season vary with branch order and month

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