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水分胁迫对楸树苗木光合特性的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2007年06期
Page:
57-60
Column:
研究论文
publishdate:
2007-06-20

Article Info:/Info

Title:
Effects of Water Stress on Photosynthetic Characteristics of Catalpa bungei
Article ID:
1000-2006(2007)06-0057-04
Author(s):
WANG Gai-ping CEN Xian-chao HE Li PENG Fang-ren*
College of Forest Resources and Environment Nanjing Forestry University, Nanjing 210037, China
Keywords:
Catalpa bungei Young seedling Water stress Photosynthetic characteristic
Classification number :
S718
DOI:
10.3969/j.jssn.1000-2006.2007.06.013
Document Code:
A
Abstract:
By the techniques of PEG, one-year-old seedlings of 8 Catalpa bungei varieties or types grew in phytotron. The effects of different levels of water stress on its photosynthetic characteristics were studied. A completely random experiment was designed with 4 treatments and 3 replicates. The results showed that the chlorophyll fluorescence parameters of 8 varieties of catalpa bungei, e.g., the net photosynthesis rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), intercellular CO2 concentration (Ci), Fv/Fm and Fv’/Fm’, decreased due to water stress. The decreases of these parameters were smaller in 4% water stress while they were greater in 8% and 12% water stress. The decreases of Pn and Ci were mainly caused by the decrease of Gs for 4 varieties of Zhou-2, Guang-ye, Zi-shu and Nan-yang. For variety of Qiu-shu, Yuan-chang, ’Yu-1’ and Jin-shi, the decreases of Pn and Ci were not caused by stomatal conductance, but they are due to the decrease of photosynthetic capacity of mesophyll cells. It was seen that Nan-yang, Guang-ye, Zhou-2 and Jin-si was more tolerant to water stress than ’Yu-1’, Qiu-shu, Zi-shu and Yuan-chang.

References

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Last Update: 2013-05-20