| Drought resistance and photosynthetic characteristics of maize at grain-filling stage at Dunhuang Oasis, Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2016.04.17 |
| Key Words: maize drought stress drought resistance photosynthetic characteristics |
| Author Name | Affiliation | | ZHOU Yu-qian | Crop research institute, Gansu Province Academy of Agricultural Sciences, LanZhou, Gansu 730070, China | | KOU Si-rong | Crop research institute, Gansu Province Academy of Agricultural Sciences, LanZhou, Gansu 730070, China | | LIAN Xiao-rong | Crop research institute, Gansu Province Academy of Agricultural Sciences, LanZhou, Gansu 730070, China |
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| Abstract: |
| Field experiment was conducted at Oasis Agricultural Area of Dunhuang City, Gansu Province where annual rainfall is less than 40mm. Maize cultivars,Longdan No.9 , Xianyu No.335, Longdan No.10, and Shendan No.16 were used to evaluate drought resistance and photosynthetic characteristics during grain-filling stage. The results showed that: (1) Apart from spike number, morphological traits and photosynthetic parameters were significantly different among 4 cultivars under drought stress and adequate water supply. After drought stress, the average plant height of cultivars was decreased by 40.25 cm, biomass, weight of spike, weight of grain, number of grain by 132.87 g, 90.48 g, 79.15 g, 167.59,100 grain weight, panicle number, seed yield reduced by 3.75 g, 0.08, 7.75%. As drought resistance decreased, photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and chlorophyll content decreased. (2) D value of comprehensive evaluation of drought resistance showed that drought resistance order ofwas Xianyu No.335, Longdan No.9, Shendan No.16, Longdan No.10. (3) Correlation and stepwise regression analysis showed that drought resistance and transpiration rate in grain-filling stage were significantly correlated for the four cultivars. |
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