| Relationship between leaf temperature and water status in sorghum under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2013.06.026 |
| Key Words: sorghum drought stress leaf temperature leaf temperature difference water status |
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| Abstract: |
| Based on the theory that leaf temperature could reflect the physiological characteristics such as water status and stomata movement in plants under drought stress, the relationship between leaf temperature and moisture condition in sorghum was studied for analyzing its response mechanism t
o drought-resistance. With 4 sorghum varieties with different drought-resistance as the test materials under pot cultivation, drought stress treatments were conducted at jointing stage, flowering stage and filling stage, respectively, with normal irrigation as control. Leaf free water content, water loss rate of cutting leaves and leaf relative water content were measured, and leaf temperature changes were recorded by infrared thermal imager after 7 days of drought stress. The results indicated that, under drought stress, the leaf water parameters such as free water content, bound water content, relative water content and water loss rate of cutting leaves showed a declining trend at different growth stages of sorghum. The above parameters of Jiza305 (highly drought-resistant variety) decreased significantly less than those of Jiza127 (highly drought-sensitive varie
ty), while Jinza106 (medium drought-resistant variety) and Jinza103 (drought-sensitive variety) performed in between. Leaf temperature difference was positively related with free water content and relative water content (P＜0.05) and negatively with bound water content (P＜0.01). Leaf temperature changes can reflect leaf water status, and leaf temperature difference can serve as
an important indicator for screening of drought resistance in sorghum. Therefore, it is feasible to apply infrared thermal imager technology for screening of drought-resistance in sorghum. |
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