Key Laboratory of Central South Fast growing Timber Cultivation of Forestry Ministry of China

Nanning, China

Key Laboratory of Central South Fast growing Timber Cultivation of Forestry Ministry of China

Nanning, China

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Yao R.,Guangxi Forestry Research Institute | Yao R.,Nanjing Forestry University | Yao R.,Key Laboratory of Central South Fast growing Timber Cultivation of Forestry Ministry of China | Wang Y.,Guangxi Forestry Research Institute | And 2 more authors.
African Journal of Agricultural Research | Year: 2011

Cyclocarya paliurus seedlings were cultured in a greenhouse under saline conditions in 50 L black plastic boxes containing Hoagland-Arnon nutrient solution. Plants were treated with a nutrient solution plus 85 mM NaCl and 0, 6, 12 or 18 mM Ca(NO3)2. Vegetative growth, leaf and root Na+ and Ca2+ concentrations were measured. Na+ toxicity symptoms were observed in plants non-treated with Ca2+. Shoot length was higher in Ca2+ treated plants, although shoot growth was reduced at 18 mM CaNO3, probably due to the high total ion concentration reached in the external solution. Ca2+ supply linearly increased leaf and root Ca2+ concentration and decreased leaf Na+ concentration. However, there were no differences in root Na+ concentration. Results indicate that Ca2+ may take part in the Na+ exclusion mechanism, mainly preventing Na+ transport to the shoot that may be an important ability for survival under saline conditions. © 2011 Academic Journals.


Yao R.L.,Guangxi Forestry Research Institute | Yao R.L.,Nanjing Forestry University | Yao R.L.,Key Laboratory of Central South Fast growing Timber Cultivation of Forestry Ministry of China | Wang Y.,Guangxi Forestry Research Institute | Wang Y.,Key Laboratory of Central South Fast growing Timber Cultivation of Forestry Ministry of China
Horticulture Environment and Biotechnology | Year: 2012

The effect of varying Ca(NO3)2 supply (0, 6, 12, and 18 mM) on growth, ion uptake, leaf chlorophyll concentration and photosynthesis of NaCl-stressed (85 mM NaCl) Cyclocarya paliurus seedlings was investigated. Addition of Ca(NO3)2 stimulated the shoot growth more than root growth. Ca(NO3)2 supply increased K+ and Ca2+ concentration, whereas the Na+ transport to the leaves was inhibited. There was a strong increase in the K+/Na+ ratio in the leaves of Ca(NO3)2-treated seedlings. Leaf chlorophyll concentration and photosynthesis rate were low, but both factors were enhanced by 12 mM Ca(NO3)2. Therefore, moderate Ca(NO3)2 supply (12 mM) had optimal effects on growth and metabolism of NaCl-stressed C. paliurus seedlings. © 2012 Korean Society for Horticultural Science.


Yao R.L.,Guangxi Zhuang Autonomous Region Forestry Research Institute | Yao R.L.,Southern Cross University of Australia | Yao R.L.,Key Laboratory of Central South Fast growing Timber Cultivation of Forestry Ministry of China | Yao R.L.,Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation | And 2 more authors.
Southern Forests | Year: 2014

In eucalypt plantations in subtropical Australia, Eucalyptus dunnii exhibits greater diameter increment after thinning than more shade-tolerant Corymbia citriodora. To elucidate the mechanism underlying this difference, we investigated relationships between tree leaf area and sapwood area following thinning in 11-year-old E. dunnii and C. citriodora plantations. There was no significant difference in specific leaf area (SLA) between thinned and unthinned stands in E. dunnii and C. citriodora, whereas crown zone significantly affected SLA in the two eucalypts. At the whole-tree level non-linear leaf area (Al)-sapwood area (As) relationships were measured in both eucalypts by thinning treatment. A significant increase in Al/As ratio was only observed at the upper crown in thinned E. dunnii. The present results suggested the plastic nature of response of leaf characteristics in both eucalypts grown in different light environments and the species-specific pattern of crown-zone leaf responses to thinning in the two species, i.e. the top of the canopy appears to be driving greater growth response to thinning in the less shade tolerant E. dunnii compared with the more shade-tolerant C. citriodora. It is concluded that different thinning regimes should be applied in shade-tolerant and shade-intolerant eucalypt forests. © 2014 Copyright © NISC (Pty) Ltd.

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