Pressure-volume curves and drought resistance of <EM>Catalpa bungei</EM> cultivars

CEN Xian-chao; PENG Fang-ren; CHEN Long-sheng; YANG Yan

Volume 25 Issue 6

Dec. 2008

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CEN Xian-chao, PENG Fang-ren, CHEN Long-sheng, YANG Yan. Pressure-volume curves and drought resistance of Catalpa bungei cultivars[J]. Journal of Zhejiang A&F University, 2008, 25(6): 760-764.

Citation:

CEN Xian-chao, PENG Fang-ren, CHEN Long-sheng, YANG Yan. Pressure-volume curves and drought resistance of Catalpa bungei cultivars[J]. Journal of Zhejiang A&F University, 2008, 25(6): 760-764.

Pressure-volume curves and drought resistance of Catalpa bungei cultivars

1.
College of Forest Resources and Environment，Nanjing Forestry University，Nanjing 210037，Jiangsu，China;
2.
Institute of Jiangxi Soil and Water Conservation，Nanchang 330029，Jiangxi，china

More Information

Corresponding author: PENG Fang-ren
Publish Date: 2008-12-20

Abstract

The Catalpa bungei resource has greatly diminished owing to self-incompatibility and improper planting in arid lands. To provide a theoretical foundation for afforestation in arid and semi-arid regions and to exploit the Catalpa resource，11 parameters of water characteristics for three Catalpa cultivars（‘Jin Si Qiu’，‘Zhou Qiu Ⅱ’，and ‘Yuan Ji Chang Guo Qiu’） were determined using culm-water characteristic curves. Seedlings from cuttings of C. bungei were cultured in Hoagland nutrient solution with 120 g·L－1 polyethylene glycol（PEG） 6000（treatment Ⅰ） to simulate draught stress and without PEG（treatment Ⅱ）. One day after treatment application，the stems were measured by Hammel’s Method. Also draught resistance exponent functions were used for the analysis. Results from maximum osmotic potential at a water saturation point of Ψπ100，sufficiency expanded osmotic potential of Ψp100，apoplastic water volume（Vb），the ratio of apoplastic water to free water（Vb/Vf），and the relative apoplast water content（CAW） showed that ‘Jin Si Qiu’ was most resistant to draught stress. Exponential functions for draught resistance of Catalpa cultivars for treatments Ⅰ and Ⅱ were in the order：‘Jin Si Qiu’Ⅱ＞ ‘Zhou Qiu’Ⅱ＞ ‘Zhou Qiu’ Ⅰ＞ ‘Jin Si Qiu’ Ⅰ ＞ ‘Yuan Ji Chang Guo Qiu’ Ⅱ＞ ‘Yuan Ji Chang Guo Qiu’ Ⅰ. So，‘Jin Si Qiu’ was the best cultivar for planting in drought area. ［Ch，2 tab. 23 ref.］
- plant physiology,
- Catalpa bungei,
- water indexes,
- culm-water characteristic curves,
- drought resistance

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Pressure-volume curves and drought resistance of Catalpa bungei cultivars

1. College of Forest Resources and Environment，Nanjing Forestry University，Nanjing 210037，Jiangsu，China;

2. Institute of Jiangxi Soil and Water Conservation，Nanchang 330029，Jiangxi，china

Corresponding author: PENG Fang-ren

Publish Date: 2008-12-20

Key words:

Abstract: The Catalpa bungei resource has greatly diminished owing to self-incompatibility and improper planting in arid lands. To provide a theoretical foundation for afforestation in arid and semi-arid regions and to exploit the Catalpa resource，11 parameters of water characteristics for three Catalpa cultivars（‘Jin Si Qiu’，‘Zhou Qiu Ⅱ’，and ‘Yuan Ji Chang Guo Qiu’） were determined using culm-water characteristic curves. Seedlings from cuttings of C. bungei were cultured in Hoagland nutrient solution with 120 g·L－1 polyethylene glycol（PEG） 6000（treatment Ⅰ） to simulate draught stress and without PEG（treatment Ⅱ）. One day after treatment application，the stems were measured by Hammel’s Method. Also draught resistance exponent functions were used for the analysis. Results from maximum osmotic potential at a water saturation point of Ψπ100，sufficiency expanded osmotic potential of Ψp100，apoplastic water volume（Vb），the ratio of apoplastic water to free water（Vb/Vf），and the relative apoplast water content（CAW） showed that ‘Jin Si Qiu’ was most resistant to draught stress. Exponential functions for draught resistance of Catalpa cultivars for treatments Ⅰ and Ⅱ were in the order：‘Jin Si Qiu’Ⅱ＞ ‘Zhou Qiu’Ⅱ＞ ‘Zhou Qiu’ Ⅰ＞ ‘Jin Si Qiu’ Ⅰ ＞ ‘Yuan Ji Chang Guo Qiu’ Ⅱ＞ ‘Yuan Ji Chang Guo Qiu’ Ⅰ. So，‘Jin Si Qiu’ was the best cultivar for planting in drought area. ［Ch，2 tab. 23 ref.］

Pressure-volume curves and drought resistance of Catalpa bungei cultivars

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通讯作者: 陈斌, bchen63@163.com

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Pressure-volume curves and drought resistance of Catalpa bungei cultivars

1. College of Forest Resources and Environment，Nanjing Forestry University，Nanjing 210037，Jiangsu，China;

2. Institute of Jiangxi Soil and Water Conservation，Nanchang 330029，Jiangxi，china

Corresponding author: PENG Fang-ren

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Pressure-volume curves and drought resistance of Catalpa bungei cultivars

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通讯作者: 陈斌, bchen63@163.com

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Pressure-volume curves and drought resistance of Catalpa bungei cultivars

1. College of Forest Resources and Environment，Nanjing Forestry University，Nanjing 210037，Jiangsu，China; 2. Institute of Jiangxi Soil and Water Conservation，Nanchang 330029，Jiangxi，china

Corresponding author: PENG Fang-ren

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1. College of Forest Resources and Environment，Nanjing Forestry University，Nanjing 210037，Jiangsu，China;

2. Institute of Jiangxi Soil and Water Conservation，Nanchang 330029，Jiangxi，china