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Acta Agronomica Sinica ›› 2018, Vol. 44 ›› Issue (7): 1086-1094.doi: 10.3724/SP.J.1006.2018.01086

• RESEARCH NOTES • Previous Articles     Next Articles

Relationship between Potato Canopy-air Temperature Difference and Drought Tolerance

Bin YU1,Hong-Yu YANG1,Li WANG2,Yu-Hui LIU1,Jiang-Ping BAI1,Feng ZHANG1,Di WANG1,Jun-Lian ZHANG1,*()   

  1. 1 College of Agronomy, Gansu Key Laboratory of Crop Improvement & Germplasm Enhancement, Gansu Provincial Key Laboratory of Arid land Crop Science, Gansu Agricultural University, Lanzhou 730070, Gansu, China;
    2 College of Life Science and Technology, Gansu Agricultural University, Lanzhou 730070, Gansu, China
  • Received:2018-01-10 Accepted:2018-03-26 Online:2018-07-10 Published:2018-04-28
  • Contact: Jun-Lian ZHANG E-mail:zhangjunlian77@163.com
  • Supported by:
    This study was supported by the International Science & Technology Cooperation Program of China (2014DFG31570), the China Agriculture Research System (CARS-09-P14), the Research Program Sponsored by Gansu Provincial Key Laboratory of Arid land Crop Science, Gansu Agricultural University (GSCS-2016-09), and Gansu Scientific Research Foundation for the Higher Education Institutions (2015A-068, GSKYYWF2014-1).

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Abstract:

The canopy-air temperature difference can reflect the physiological adaptability of plants under drought stress. In this study, drought tolerant varieties Jizhangshu 8 and Longshu 10, drought sensitive varieties Atlantic and Shepody, and ten potato clones with different drought tolerance levels from Peru International Potato Center were used to measure plant phenotypic traits (plant height, leaf area, leaf fresh weight, normalized difference vegetation index), photosynthetic indexes (photosynthetic rate, stomatal conductance, transpiration rate, chlorophyll content) and the canopy-air temperature difference, and evaluated the drought tolerance under semi-arid and semi-humid environments. The canopy-air temperature difference, transpiration rate and stomatal conductance were most sensitive to drought stress. The canopy-air temperature difference was significantly different among different potato varieties (clones) under semi-arid and semi-humid environments. The drought tolerance coefficient of canopy-air temperature difference showed significantly positive correlations with drought tolerance coefficients of plant phenotypic characters and photosynthetic indexes. The canopy-air temperature difference is an effective indicator to evaluate potato drought tolerance by using infrared thermometers, which could provide a theoretical basis for the research of potato drought tolerance breeding.

Key words: potato, canopy-air temperature difference, photosynthetic physiology characteristics, drought tolerance coefficient

Table 1

Experimental varieties and code of potato germplasm resources from CIP"

类型 Type 品种和CIP编号 Varieties and CIP entry
干旱敏感型
Drought sensitive		 大西洋(Atlantic), 夏波蒂(Shepody), CIP1 (CIP 300054.29), CIP2 (CIP 391065.69), CIP3 (CIP 394613.139), CIP4 (CIP 393085.5), CIP5 (CIP 393073.179)
耐旱型
Drought tolerant		 冀张薯8号(Jizhangshu 8), 陇薯10号(Longshu 10), CIP6 (CIP 397044.25), CIP7 (CIP 388615.22), CIP8 (CIP 392797.22), CIP9 (CIP 397067.2), CIP10 (CIP 391207.2)

Fig. 1

Dynamic of monthly mean rainfall and temperature in experiment areas"

"

Fig. 2

Thermal images taken by infrared imaging systemsThe figures a and b represent the thermal imaging of drought tolerant variety Longshu 10 under semi-humid region and semi-arid region, the figures c and d represent the thermal imaging of drought sensitive variety Shepody under semi-humid region and semi-arid region. The different color points in the palette represent different temperature values."

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Table 5

Correlation coefficients among drought tolerant indexes of traits related to drought tolerance"

性状
Trait		 样本数
Number		 株高
Plant height		 叶面积
Leaf area		 叶鲜重
Leaf fresh weight		 叶绿素
Chlorophyll content		 植被覆
盖指数
NDVI		 光合
速率
Pn		 气孔
导度
Gs		 蒸腾
速率
Tr
叶面积 Leaf area 84 0.399**
叶鲜重 Leaf fresh weight 84 0.371** 0.688**
叶绿素 Chlorophyll content 84 0.579** 0.263* 0.412**
植被覆盖指数 NDVI 84 0.455** 0.429** 0.553* 0.487**
光合速率 Pn 84 0.190 0.311** 0.274* -0.006 0.339**
气孔导度 Gs 84 0.143 0.338** 0.191 0.235* 0.317** -0.084
蒸腾速率 Tr 84 0.073 0.283** 0.270* 0.117 0.476** 0.174 0.657**
冠气温差Canopy-air temperature difference 84 0.324** 0.522** 0.614** 0.281** 0.427** 0.411** 0.263* 0.345**
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